Abstract: A process for the production of trialkoxyhalosilanes which comprises reacting a tetrahalosilane [37] with a tetra-alkoxysilane [38] in the presence of an alcohol whose alkoxy group is the same as those of the tetraalkoxysilane to thereby obtain a trialkoxyhalosilane [39], characterized in that the alcohol is used in an amount of 5 to 50% by mole based on the total amount of Si of the tetrahalosilane and the tetraalkoxysilane: SiX4 [37] (wherein X is halogeno) Si(OR1)4 [38] (wherein R1 is a hydrocarbon group having 1 to 6 carbon atoms) XSi(OR1)3 [39] (wherein X and R1 are each as defined above).

Abstract: A silicon enolate represented by the following formula (Formula 1) (in the formula, R5 to R7 represent hydrogen atoms, aliphatic hydrocarbon groups, monocyclic or polycyclic alicyclic hydrocarbon groups, monocyclic or polycyclic aromatic or aromatic-aliphatic hydrocarbon groups or heterocyclic groups, R5 and R7 are different, R6 is not a hydrogen atom, each R8 may be identical or different and represents a methyl group, ethyl group or isopropyl group) and formaldehyde are allowed to react in an aqueous solution or a mixed solvent of water and an organic solvent in the presence of a catalyst obtained by mixing a ligand comprising a chiral bipyridine compound or its antipode and Bi(OTf)3.

Abstract: The present invention provides a process for using nanosized copper, nanosized copper oxides, nanosized copper chlorides, other nanosized copper salts, and mixtures thereof, as sources of catalytic copper in the Direct Synthesis of trialkoxysilanes of the formula HSi(OR)3 wherein R is an alkyl group containing from 1 to 6 carbon atoms inclusive. The nanosized copper, nanosized copper oxides, nanosized copper chlorides, other nanosized copper salts, and their mixtures of this invention have average particle sizes that are in the range from about 0.1 to about 60 nanometers, preferably from about 0.1 to about 30 nanometers, and most preferably from about 0.1 to about 15 nanometers. Nanosized sources of catalytic copper afford high dispersion of catalytic sites on silicon and contribute to high reaction rates, high selectivity and high silicon conversion. The nanosized copper catalyst precursors of the invention permit the use of substantially reduced levels of copper compared to conventional practice.

Abstract: A process is provided for separating a mixture of alkoxysilanes and alkanol, e.g., the crude product effluent of the Direct Reaction of silicon metal with alkanol, which comprises: a) introducing a mixture of alkoxysilane(s) and alkanol to a separation unit possessing a separation membrane having a first surface and an opposing second surface; b) contacting the mixture of alkoxysilane(s) and alkanol with the first surface of the separation membrane whereby one or more components of the mixture selectively absorb into the first surface and permeate therethrough to the second surface under the influence of a concentration gradient across the membrane thereby separating the mixture into an alkanol-enriched permeate fraction and an alkanol-deficient retentate fraction or an alkoxysilane-enriched permeate fraction and an alkoxysilane-deficient retentate fraction; and, c) recovering the permeate fraction.

Abstract: In one aspect, the invention relates to hydrolysis-resistant silicone compounds. In particular, disclosed are sterically hindered hydrolysis-resistant silicone compounds and improved purity hydrolysis-resistant silicone compounds. Also disclosed are processes for making hydrolysis-resistant silicone compounds; the products of the disclosed processes; compositions and polymers comprising the disclosed compounds and products of the disclosed processes; and ophthalmic lenses, for example contact lenses, intraocular lenses, artificial cornea, and spectacle lenses, comprising the disclosed compositions, disclosed polymers, disclosed compounds, and products of the disclosed processes. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

Abstract: A fluorine-containing acetylene alcohol represented by the following formula (1), wherein Rf is a linear or branched perfluoroalkyl group having 3 to 100 carbon atoms and may have an ether bond, —C—O—C—, Q is a divalent hydrocarbon group having 1 to 6 carbon atoms, and R1 is an alkyl group having 1 to 4 carbon atoms.

Abstract: The disclosure herein relates to organofunctional silanes and mixtures of organofunctional silanes possessing mercaptan and hydrocarbyl and/or heterocarbyl functionality. These silanes reduce or eliminate the generation of volatile organic compounds (VOC's) during use, aid in the processing of filled elastomeric materials and enhance the end-use properties of the filled elastomer. The present disclosure relates to a free flowing filler composition comprising these silanes.

Abstract: A new nitrogen-containing organosilicon compound contains tertiary amine groups and carbonyl groups wherein the tertiary amine groups are selected from R1R2N— (where R1 and R2 are the same or different univalent hydrocarbon groups of 1-15 carbon atoms), alicyclic amino groups, or heterocyclic amino groups containing in their rings one or more tertiary amine groups.

Abstract: Electron donor compounds, suitable for use as adhesives or as components in adhesives, contain a carbon to carbon double bond attached to an aromatic ring and conjugated with the unsaturation in the aromatic ring.

Abstract: A ?,?-unsaturated carboxylic acid silyl ester is prepared by reacting an ?,?-unsaturated carboxylic acid ester with a hydrosilane or hydrosiloxane in the presence of tris(pentafluorophenyl)borane. ?,?-Unsaturated carboxylic acid derivatives are readily prepared through fewer steps and in high yields.

Abstract: According to an aspect of the invention, there is provided an organic silicon compound represented by the following Formula (I) or Formula (II): (R1)x(OR)3-xSi-L1-(A)-L2-Si(OR3)3-y(R4)y ??Formula (I) (R5)z(OR6)3-zSi-L3-(B)—R7 ??Formula (II) wherein, R1 to R6 each independently represent a hydrogen atom or a hydrocarbon group having 8 or less carbon atoms; R7 represents a hydrogen atom or a monovalent non-metal atom group; x, y and z each independently represent an integer from 0 to 2; L1, L2 and L3 each independently represent a divalent linking group having three or more different atoms selected from the group consisting of a carbon atom, a hydrogen atom, an oxygen atom, a nitrogen atom and a sulfur atom; and A and B each independently represent a polymer or oligomer having a repeating structure formed by a structural unit.

Abstract: The invention relates to a composition comprising a compound of formula (I): Rf—B—Ro—Z and a compound of formula (II): and/or their reaction product.

Abstract: A polypodal silane compounds are provided for use as a bonded phase and which have embedded hydrophilicity. The compounds have at least two podal branches bonded via an ether linkage or alkoxy group to a hydrophilic group. Each podal branch has a silicon atom which is bonded to each podal branch through a Si—C bond and each of the podal branches is capable of bonding to a siliceous substrate through at least one hydrolyzable functional group capable of being displaced by a Si—O bond. Bonded phases using such compounds and substrates having such compounds bonded to their surface are also described, as well as a method for preparing a bonded phase.

Abstract: Methods are provided for carrying out nucleophilic addition reactions using oxo, sulfido or amido complexes of transition metals as reaction catalysts. Exemplary catalysts are oxo complexes of Group 7 transition metals, with rhenium (V) oxo complexes, including dioxo complexes, preferred. Nucleophilic addition reactions that can be catalyzed using the present methods include silylation, hydrosilylation, hydroamination, silylmetalation, carbometalation, aldol reactions, hydro- and carbometalation initiated cyclization/polymerization, and epoxide/aziridine opening. The invention also pertains to novel transition metal complexes that have utility in catalyzing such reactions.

Abstract: Methods, compounds, and kits are provided for derivatizing organometallic halide compounds. The methods include reacting an organometallic halide with a reagent to produce an analyte having desired properties. In a preferred form, the analyte has properties that render it more susceptible to chemical analysis in relation to its respective organometallic halide. The compounds include the analyte product of the derivatization reaction. The kits include a reagent and, preferably, some or all of the tools that may be used to perform the derivatization reaction.

Abstract: Processes are provided for producing organchlorosilanes and dipodal silanes in which an organic halide or alkene or chloralkene is reacted with a hydridochlorosilane in the presence of a quaternary phosphonium salt catalyst by providing sufficient heat to effect a dehydrohalogenative coupling reaction and/or a hydrosilylation reaction and venting the reaction to control reaction pressure and to remove gaseous byproducts from the reaction. The processes are preferably continuous using a catalyst in fluid form at reaction pressures not exceeding about 600 psi. The reactions may be carried out substantially isothermally and/or isobarically, for example in a plug flow reactor or continuous stirred tank reactor. The processes may produce novel silylated compounds including 1,2-bis(trichlorosilyl)decane or 1,2-bis(trimethoxysilyl)decane.

Abstract: Polymerizable silicon-containing compounds of formula (1) wherein R1 is hydrogen, halogen or monovalent organic group are polymerized into polymers.

Abstract: An insulating film material formed by chemical vapor deposition, which contains an organic silane compound having such a structure that at least one secondary hydrocarbon group and/or tertiary hydrocarbon group is directly bonded to a silicon atom.

Abstract: A metallocene catalyst in which the metal is coordinated by a ?5 cyclopentadienyl ligand which forms part of an indenyl or indenyloid moiety, characterized in that said moiety is directly or indirectly substituted at the 4-, 5-, 6- or 7-position by a pendant siloxy or germyloxy group.

Abstract: An acetylene alcohol represented by the following formula, wherein R1 represents a monovalent hydrocarbon radical having 4 to 10 carbon atoms with the carbon atom bonded to the silicon atom being a tertiary carbon, R2 and R3 each represents a monovalent group selected from the group consisting of alkyl groups having 1 to 4 carbon atoms and a fluorinated group represented by the formula, Rf—Q—, wherein Rf is a linear or branched perfluoroalkyl group having 3 to 100 carbon atoms which may be interrupted by one or more ether bonds, and Q is a divalent group having 2 to 10 carbon atoms which may be interrupted by one or more nitrogen, oxygen, or sulfur atoms, and n is zero or 1.

Abstract: Processes are disclosed for preparing the antiviral agent entecavir. A resin adsorption process for the isolation and purification of entecavir is also disclosed. Various intermediates useful in the preparation of entecavir are also disclosed.

Abstract: Organometallic complexes are provided, which include a catalyst containing a transition metal, a ligand and a component having the formula GArF. ArF is an aromatic ring system selected from phenyl, naphthalenyl, anthracenyl, fluorenyl, or indenyl. The aromatic ring system has at least a substituent selected from fluorine, hydrogen, hydrocarbyl or fluorinated hydrocarbyl, G is substituted or unsubstituted (CH2)n or (CF2)n, wherein n is from 1 to 30, wherein further one or more CH2 or CF2 groups are optionally replaced by NR, PR, SiR2, BR, O or S, or R is hydrocarbyl or substituted hydrocarbyl, GArF being covalently bonded to either said transition metal or said ligand of said catalyst, thereby rendering said cationic organometallic complex liquid.

Abstract: Electron donor compounds, suitable for use as adhesives or as components in adhesives, contain a carbon to carbon double bond attached to an aromatic ring and conjugated with the unsaturation in the aromatic ring.

Abstract: This invention pertains to a siloxane resin composition comprising R1SiO3/2 siloxane units, R2SiO3/2 siloxane units and (R3O)bSiO(4-b)/2 siloxane units wherein R1 is an alkyl group having 1 to 5 carbons, hydrogen, or mixtures thereof; R2 is a monovalent organic group having 6 to 30 carbons; R3 is a branched alkyl group having 3 to 30 carbons, b is from 1 to 3; and the siloxane resin contains from 2.5 to 85 mole percent R1SiO3/2 units, 2.5 to 50 mole percent R2SiO3/2 units and 5 to 95 mole percent (R3O)bSiO(4-b)/2 units. The siloxane resin is useful to make insoluble porous resin and insoluble porous coatings. Heating a substrate coated with the siloxane resin at a sufficient temperature effects removal of the R2 and R3O groups to form an insoluble insoluble porous coating having a porosity of 1 to 60 volume percent and a dielectric constant in the range of 1.5 to 3.0.

Abstract: The invention relates to a method for producing special transition metal compounds, to novel transition metal compounds and to the use of the same for the polymerisation of olefins.

Abstract: A method comprises reacting a compound of the general formula R14-mMOR3m wherein m is an integer from 2 to 4, R1 is selected from alkyl, alkenyl, aryl, alkynyl or epoxy, and wherein R1 is nonfluorinated, or fully or partially fluorinated; OR3 is alkoxy; and M is an element selected from group 14 of the periodic table; with a compound of the general formula R2M1 wherein R2 is selected from alkyl, alkenyl, aryl, alkynyl or epoxy, and wherein R2 is at least partially fluorinated; and M1 is an element from group I of the periodic table; so as to make a compound of the general formula R14-mMOR3m-1R2.

Abstract: The present invention relates to a silicon ether compound having general formula (I): wherein, R and R1-R10 groups, which may be Identical or different, represent hydrogen, halogen, C1-C20 linear or branched alkyl, C3-C20 cycloalkyl, C8-C20 aryl, C7-C20 alkaryl or C7-C20 aralkyl group, and two or more R groups can be linked to form saturated or unsaturated condensed ring structure which is optionally substituted by a group having the same meanings with that of R1, R and R1-R10 groups optionally contain one or more hetero-atoms replacing carbon atom, hydrogen atom or the both, said heteroatom is selected from the group consisting of nitrogen, oxygen, sulfur, silicon, phosphorus and halogen atom, and A represents carbon atom or silicon atom. The present invention also relates to a method for the preparation of the silicon ether compounds of general formula (I) and a process for polymerization of olefins.

Abstract: Disclosed is an oxazolidine compound represented by the following formula (1). [R1 represents a hydrocarbon group having 1 to 6 carbon atoms; R2 and R3 independently represent a hydrogen atom or a monovalent hydrocarbon group having 1 to 15 carbon atoms, or R2 and R3 combine to form an alicyclic ring or an aromatic ring; R4 and R5 independently represent a methyl group or an ethyl group; R6 represents a single bond or —(R7—NHCOO—R8—OCONH)p—, R7 and R8 independently represent a divalent organic group, and p represents an integer of 1 to 15; m represents 2 or 3; n represents an integer of 1 to 3]. A curable resin composition using the oxazolidine compound as a latent curing agent have excellent curability and excellent storage stability, in particular, excellent storage stability in a state where the resin composition contains only the curable ingredient(s) and the latent curing agent.

Abstract: Disclosed are compounds comprising both disulfide functionality and electron donor functionality or alkoxy siloxane functionality, and curable compositions comprising compounds comprising both disulfide functionality and electron donor functionality, or electron acceptor functionality, or alkoxy siloxane functionality.

Abstract: The invention discloses a novel method for the preparation of globular particles of a silicone resin or, in particular, a polyorganosilsesquioxane resin having properties suitable as an adjuvant in hair-care toiletry preparations by the hydrolysis condensation reaction of an organotrialkoxy silane compound such as methyl trimethoxysilane in an aqueous alkaline medium. Characteristically, the aqueous reaction medium is alkalified with ammonia or, preferably, an amine compound, e.g., mono(n-alkyl) amine compound, to have a specified pH value of 10.0 to 13.0 and the hydrolysis condensation reaction of the starting silane compound in the aqueous medium is conducted in the presence of metallic ions or, in particular, magnesium ions in a specified concentration of 1×10−5 to 1×10−2 mole/liter.

Abstract: The present invention relates to a silicon ether compound having general formula (I): 1

Abstract: Silica-based low dielectric constant materials having three-dimensional network structures containing siloxane backbones which comprise SiO4 tetrahedron structural units, as well as their production and use. The materials can be applied as interlayer dielectrics for semiconductor elements and the like.

Abstract: A compound is provided including an organometallic complex represented by the formula I: [CpM(CO)2(NHC)Lk]+A−  I wherein M is an atom of molybdenum or tangsten, Cp is substituted or unsubstituted cyclopentadienyl radical represented by the formula [C5Q1Q2Q3Q4Q5], wherein Q1 to Q5 are independently selected from the group consisting of H radical, C1-20 hydrocarbyl radical, substituted hydrocarbyl radical, halogen radical, halogen-substituted hydrocarbyl radical, —OR, —C(O)R′, —CO2R′, —SiR′3 and —NR′R″, wherein R′ and R″ are independently selected from the group consisting of H radical, C1-20 hydrocarbyl radical, halogen radical, and halogen-substituted hydrocarbyl radical, wherein said Q1 to Q5 radicals are optionally linked to each other to form a stable bridging group, NHC is any N-heterocyclic carbene ligand, L is either any neutral electron donor ligand, wherein k is a number from 0 to 1 or L

Abstract: The present invention relates to asymmetrical siloxy compounds of the formula wherein R1, R2 and R3 are independently selected from the group consisting of alkoxy radicals having from 1 to 8 carbon atoms; and R4 is selected from the group consisting of substituted or unsubstituted alkylene groups having from 1 to 18 carbon atoms and arylene and alkyl substituted arylene groups having from 6 to 12 carbon atoms. The asymmetrical siloxy disulfide compounds are prepared from N-cyclohexylthiophthalimide and a mercaptoalkoxysilane.

Abstract: Aromatic silane compounds containing at least an aromatic ring bound directly to the silicon atom, wherein the aromatic ring has at least one substituent located in the ortho position selected from C1-10 hydrocarbon groups, are useful as electron donors in olefin polymerization catalysts for the production of polyolefins having a stereoblock content of from about 7 to about 25%.

Abstract: Alkenylalkoxysilanes such as allyltrimethoxysilane can be made by reacting the corresponding monoalkenyldichlorosilane, i.e., allyldichlorosilane, with a monohydroxy alcohols, i.e., methyl alcohol. No catalyst is required and the reactions can be carried out at room temperature.

Abstract: This invention is related to heteroatom containing diamondoids (i.e., “heterodiamondoids”) which are compounds having a diamondoid nucleus in which one or more of the diamondoid nucleus carbons has been substitutionally replaced with a noncarbon atom. These heteroatom substituents impart desirable properties to the diamondoid. In addition, the heterodiamondoids are functionalized affording compounds carrying one or more functional groups covalently pendant therefrom. This invention is further related to polymerizable functionalized heterodiamondoids. In a preferred aspect of this invention the diamondoid nuclei are triamantane and higher diamondoid nuclei. In another preferred aspect, the heteroatoms are selected to give rise to diamondoid materials which can serve as n- and p-type materials in electronic devices can serve as optically active materials.

Abstract: A liquid precursor for forming a transparent metal oxide thin film comprises a first organic precursor compound. In one embodiment, the liquid precursor is for making a conductive thin film. In this embodiment, the liquid precursor contains a first metal from the group including tin, antimony, and indium dissolved in an organic solvent. The liquid precursor preferably comprises a second organic precursor compound containing a second metal from the same group. Also, the liquid precursor preferably comprises an organic dopant precursor compound containing a metal selected from the group including niobium, tantalum, bismuth, cerium, yttrium, titanium, zirconium, hafnium, silicon, aluminum, zinc and magnesium. Liquid precursors containing a plurality of metals have a longer shelf life. The addition of an organic dopant precursor compound containing a metal, such as niobium, tantalum or bismuth, to the liquid precursor enhances control of the conductivity of the resulting transparent conductor.

Abstract: A compound of the general formula: R1R2R4MR5, wherein R1, R2 and R4 are independently an aryl, alkyl, alkenyl or alkynyl group, wherein at least one of R1, R2 and R4 is fully or partially fluorinated, wherein M is selected from group 14 of the periodic table, and wherein R5 is either an alkoxy group, OR3, or a halogen group, X. This compound formed can be further reacted to attach an additional organic R group, and/or hydrolyzed with one or more similar compounds (preferably having one or two R groups bound to M), to form a material having a molecular weight of from 500 to 10,000, which material can be deposited on various substrates as a coating or deposited and patterned for a waveguide or other optical device components. Methods for making and using compounds of the general formula R1R2R4MR5 are also disclosed.

Abstract: A compound of the general formula R1MR4R5R6 is provided where R1 is a partially or fully fluorinated aryl, alkyl, alkenyl or alkynyl group, wherein M is selected from group 14 of the periodic table, wherein R4, R5 and R6 are independently an alkoxy group OR3 or a halogen group X—except, a) where R4, R5 and R6 are each ethoxy, M is Si and R1 is perfluorinated phenyl or perfluorinated vinyl; b) where R4 is ethoxy, R5 and R6 are chlorine, M is Si, and R1 is perfluorinated phenyl; or c) where R4, R5 and R6 are chlorine, M is Si, and R1 is perfluorinated phenyl, perfluorinated methyl or perfluorinated vinyl. This compound formed can be further reacted to attach an additional organic R group, and/or hydrolyzed, alone or with one or more similar compounds, to form a material having a molecular weight of from 500 to 10,000, which material can be deposited on various substrates as a coating or deposited and patterned for a waveguide or other optical device components.

Abstract: A method comprises reacting a compound of the general formula R14-mMOR3m wherein m is an integer from 2 to 4, OR3 is an alkoxy group, and M is an element selected from group 14 of the periodic table; with a compound of the general formula R2X2+Mg, wherein X2 is Br or I; where R1 and R2 are independently selected from alkyl, alkenyl, aryl, alkynyl, or epoxy, and wherein at least one of R1 and R2 is partially or fully fluorinated; so as to make a compound of the general formula R2R14-mMOR3m-1; followed by reacting R2R14-mMOR3m-1 with a halogen or halogen compound in order to replace one or more OR3 groups with a halogen group so as to form R2R14-mMOR3m-1-nXn, where X is a halogen and n is from 1 to 3 and m<n—except where R1 is fluorinated phenyl, M is Si and OR3 is ethoxy.

Abstract: A method comprises reacting a compound of the general formula R14-mMOR3m wherein m is an integer from 2 to 4, R1 is selected from alkyl, alkenyl, aryl, alkynyl or epoxy, and wherein R1 is nonfluorinated, or fully or partially fluorinated; OR3 is alkoxy; and M is an element selected from group 14 of the periodic table; with a compound of the general formula R2M1 wherein R2 is selected from alkyl, alkenyl, aryl, alkynyl or epoxy, and wherein R2 is at least partially fluorinated; and M1 is an element from group I of the periodic table; so as to make a compound of the general formula R14-mMOR3m-1R2.

Abstract: A compound of the general formula R1R2MR4R5 is disclosed wherein R1 and R2 are independently an aryl, alkyl, alkenyl, epoxy or alkynyl group, wherein at least one of R1 and R2 is fully or partially fluorinated, wherein M is selected from group 14 of the periodic table, wherein R4 and R5 are independently an alkoxy group, OR3, or a halogen group, X, except where M is Si, R4 and R5 are both ethoxy groups or both chlorine groups, and R1 and R2 are perfluorinated groups. This compound formed can be further reacted to attach an additional organic R group, and/or hydrolyzed, alone or with one or more similar compounds, to form a material having a molecular weight of from 500 to 10,000, which material can be deposited on various substrates as a coating or deposited and patterned for a waveguide or other optical device components. Methods for making compounds of the general formula R1MR4R5R6 are also disclosed.

Abstract: The invention provides chain-coupled polymeric alkoxide compounds for use as the elastomeric component in vulcanizable elastomeric compositions comprising silica, carbon black or mixtures thereof. In particular, the invention provides anionically polymerized polymers having polymer chain living ends that are functionalized with alkoxide groups and coupled together by a metal or nonmetal atom. The polymeric alkoxide compounds have an initial high viscosity for ease of handling prior to compounding, a stable viscosity during storage, and a decreased compound viscosity for better filler dispersion and improved mixing efficiency. The invention further provides a pneumatic tire having at least one component produced from the vulcanizable elastomeric composition of the invention.

Abstract: Compounds containing vinyl silane and electron donor or electron acceptor functionality can be used as adhesion promoters or as the main resin in curable compositions.

Abstract: The specification describes and claims room temperature vulcanisable compositions formed by mixing components comprising a polysiloxane having hydroxyl or hydrolysable groups, a crosslinker having silicon bonded hydrolysable groups selected from the group consisting of alkoxy-, acetoxy- and oximo and a hydroxy terminated urethane prepolymer with no residual isocyanate groups formed from a polyol and an isocyanate. The compositions demonstrate improved adhesion, thixotropy and toolability.

Abstract: A method for the preparation of organyltriorganooxysilanes containing at least one silicon-carbon bond is provided comprising reacting at least one tetraorganooxysilane with an activated carbon and at least one base.

Abstract: Disclosed is a silicon-containing flame retardant for an organic polymer, comprising a monomer, a polymer or a mixture thereof, which is represented by the following formula (1): wherein each of R1 and R2 independently represents a monovalent C1-C20 hydrocarbon group; each of R3 and R4 independently represents a monovalent or divalent C1-C20 hydrocarbon group, with the proviso that, when each of R3 and R4 independently represents a divalent C1-C20 hydrocarbon group, R3 and R4 are bonded to each other to form a ring; and n is 1 or more in terms of the number average n-value.

Abstract: The invention is directed to multiply-substituted fullerene derivatives of novel configurations, and methods for their preparation and use. The methods involve the combinatorial synthesis of a library of fullerene derivatives and comprises the steps of forming a mixture of fullerene derivatives by reacting the Cn fullerene with two or more reactive precursor compounds, and removing the unreacted compounds to yield the fullerene derivatives having the desired activity. Methods for the identification and screening of a combinatorial library of fullerenes by 3He-nuclear magnetic resonance and electrospray mass spectrometry to define members with the optimal desired activity are also provided.

Abstract: A process for the preparation of (R)-1-(2,3-difluoro-6-nitrophenoxy)-propan-2-ol, which is a useful intermediate in the synthesis of the widely used antibiotic Levofloxacin is provided. A process for the preparation of (R)-1-(2,3-difluoro-6-nitrophenoxy)-2-trimethylsiloxypropane is also described. The process includes the ring opening of (R)-propylene oxide with 2,3-difluoro-6-nitrophenyl trimethylsilyl ether in the presence of an optically active Co(salen) catalyst. The trimethylsilyl group of the reactant is transferred to the product aryloxy alcohol, which serves to protect the secondary alcohol in situ. Upon isolation, the trimethylsilyl group is removed and the resulting regioisomeric mixture purified to yield the desired (R)-1-(2,3-difluoro-6-nitrophenoxy)-propan-2-ol in high purity and yield.