Abstract: Provided are a cyclopara(hetero)arylene compound and a method for producing the same. More specifically, provided is a cycloparaphenylene compound represented by Formula (I): wherein Ar1, Ar2, Ar3, and Ar4 are the same or different, and represent an optionally substituted divalent aromatic group or an optionally substituted divalent heteroaromatic group, and n1, n2, n3, and n4 are the same or different, and represent an integer of 1 or more.

Abstract: A method of preparing an ultra-pure metal amidinate compound comprising using a microchannel device for synthesis in reacting a metal halide solution with a lithium amidinate solution to produce an ultra-pure alkylmetal compound for processes such as chemical vapor deposition.

Abstract: Disclosed is a hydrocarboxylation process for the production of carboxylic acid from olefins wherein an olefin, water, a Group VIII metal hydrocarboxylation catalyst, an onium salt compound are combined in a reaction zone and contacted with carbon monoxide under hydrocarboxylation conditions of pressure and temperature The process does not require or utilize the addition of a hydrogen halide or an alkyl halide exogenous or extraneous to the hydrocarboxylation process.

Abstract: A method for the synthesis of a chromium complex 2, [Cr3O(carboxylate)6(H2O)3]+ (2), wherein carboxylate is a substituted or unsubstituted C2-C5 alkyl carboxylate, is provided, including the step of: heating an aqueous reaction mixture of a Cr(III) salt, a substituted or unsubstituted C2-C5 alkyl carboxylic acid and a metal hydroxide for a time period and at a temperature sufficient to generate an aqueous product mixture comprising chromium complex 2 and non-toxic byproducts.

Abstract: The present invention provides organic arsenicals. Many of these compounds have potent in vitro cytotoxic activity against numerous human tumor cell lines, both of solid and hematological origin, as well as against malignant blood cells from patients with leukemia.

Abstract: There is provided a process for preparing a carboxylic acid ester of formula (3): R2COOR1 ??(3) wherein R1 is an alkyl group which may be substituted, an alkenyl group which may be substituted, an alkynyl group which may be substituted, an aralkyl group which may be substituted, or a heteroarylalkyl group which may be substituted, and R2 is an alkyl group which may be substituted, an alkenyl group which may be substituted, an alkynyl group which may be substituted, an aryl group which may be substituted, a heteroaryl which may be substituted, an aralkyl group which may be substituted, or a heteroarylalkyl group which may be substituted, which process is characterized by the steps of reacting a monohydroxy compound of formula (1): R1OH ??(1) wherein R1 is as defined above, with a zirconium compound of formula (6): Zr(OR8)4 ??(6) wherein R8 is an alkyl group or an aryl group which may be substituted and is not the same as R1, to prepare a zirconium catalyst, and reacting a carboxylic acid of formula (2

Abstract: The invention provides an organometallic complex, containing oxygen free organic ligands, for the deposition of a metal, preferably copper, silver or gold, and preferably by way of chemical vapor deposition. The organometallic complex having the formula [(Do)nMLx]k where M is a metal preferably selected from the group consisting of Cu, Ag and Au; Do is selected from the group comprising ethers, phosphines, olefins, sulfides, pyridines, carbonyl, hydroxyl, cyclopentadiene, benzene derivatives, allyls, alkyls, amines, polyamines, aniline derivatives, cyclooctadiene and combinations thereof; n is an integer having a value from 0 to 4; k is an integer having a value from 1 to 4; x is an integer having a value from 1 to 4; and L is an amidinate ligand of the formula R1—NC(R2)N—R3 where R1, R2 and R3 are selected from the group consisting of alkyls, allyls, aryls, heteroaryls, hydrogen, non-metals and metalloids; and where R1, R2 and R3 are different or the same.

Abstract: Organo-tin compound having the formula I: [R—(Y)a]b—SnX4-b wherein R stands for a polycyclic hydrocarbyl residue which optionally carries one or several substituents; Y stands for a bivalent linker group; X represents a hydrolysable group; a is an integer 0 or 1; and b is an integer 1 or 2. The preferably stands for an unsubstituted or substituted fused hydrocarbon ring system selected from naphthalene, antracene, phenanthrene, and pentacene. The novel compounds are useful for producing polymers which can be employed as thin film materials in optoelectronic devices.

Abstract: The bridged metallocene compound or the olefin polymerization catalyst which comprises the compound, enables high polymerization activity in polymerizing one or more monomers selected from ethylene and ?-olefins. The bridged metallocene compound contains specific substituted cyclopentadienyl and fluorenyl groups which are linked via carbon or silicon atoms. In the method for the preparation of polyolefins, one or more monomers, preferably ethylene as an essential monomer, selected from ethylene and ?-olefins are copolymerized in the presence of the olefin polymerization catalyst comprising the bridged metallocene compound, so that an ethylene based polymer with an ethylene content of more than 50 mol % is obtained.

Abstract: An anti-cancer agent contains a phosphine transition metal complex having a ferrocene skeleton, the complex being represented by general formula (3) below: (wherein R1, R2, R3, and R4 each represent a linear or branched alkyl group, a cycloalkyl group, an alkoxy group, an aryl group, or an aralkyl group; A represents a linear or branched alkyl group, a phenyl group, or a hydrogen atom; M1 represents a transition metal atom selected from the group consisting of gold, copper, platinum, and silver; and X1 represents an anion).

Abstract: A method of converting Compound A (1,3-dehydro-cyclopenta[1]phenanthren-2-one) to Compound C (1H-cyclopenta[1]penanthren) in situ in a single reactor is disclosed.

Abstract: The invention is directed to manganese-containing polyoxometallates of the formula (1)(Q).sub.q (Mn.sub.p A.sub.a X.sub.x Y.sub.y M.sub.m O.sub.d Z.sub.z (H.sub.2 O).sub.b)cH.sub.2 O (1)where Q is one or more cations selected from the group consisting of H, Li, K, Na, Rb, Cs, Ca, Mg, Sr, Ba, Al, PR.sup.1 R.sup.2 R.sup.3 R.sup.4 and NR.sup.1 R.sup.2 R.sup.3 R.sup.4 where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 =H or C.sub.1 -C.sub.20 -alkyl, C.sub.5 -C.sub.8 -cycloalkyl or aryl;Mn is manganese;A is a heterometal and is one or more transition metals from transition groups II to VIII apart from Zn, in particular Ru, V, Ti, Zr, Cr, Fe, Co, Cu, Sn, Ni, Re or Os;X is one or more elements selected from the group consisting of Ga, B, P, Si, Ge, As, F, Cl, Br and I;Y is Sb, S, Te, Se and Bi;M is one or more transition metals selected from the group consisting of Mo, W, Nb, Ta and V;Z is one or more anions selected from the group consisting of OH.sup.-, F.sup.-, Cl.sup.-, Br.sup.-, I.sup.-, N.sub.3.sup.-, NO.sub.3.sup.

Abstract: An essentially water-insoluble compound of bismuth and polyacrylic acid disperses well in the bowel and forms a good mucoadhesive covering of the bowel wall. Thus in patients with inflammatory bowel disease the bismuth is held in intimate contact to the inflamed tissue of the bowel. Two processes are provided for preparing said water-insoluble compounds.

Abstract: Materials and methods for preparing the surface of dentin, enamel, or other natural or industrial substrates containing or capable of binding metallic ions, for adhesion of composite materials or resins, are disclosed. Preferably, the substrate is treated with an aqueous solution comprising at least one acid, acidic salt, or chelating or sequestering agent.

Abstract: Metallocenes are prepared by a process in which a metal salt is reacted with at least one alkali metal and with an unsaturated, cyclic hydrocarbon in the presence of a solvent in one reaction step.

Abstract: Molybdenum and tungsten compounds that are useful as catalyst precursors in the metathesis of olefins have the general formula:M(Y) (OR.sup.2).sub.x (R.sup.3).sub.y (X).sub.z L.sub.swherein M is tungsten or molybdenum; Y is oxygen or NR.sup.1 ; R.sup.1, R.sup.2, and R.sup.3 are the same or different and are selected from alkyl, cycloalkyl, cycloalkenyl, polycycloalkyl, polycycloalkenyl, haloalkyl, haloaralkyl, substituted or unsubstituted aralkyl and aryl groups, and silicon-containing analogs thereof; L is a Lewis base; X is halogen; s is 0 or 1; x+y+z=4, and y.gtoreq.1, provided that when x is 2 or more, two OR.sup.2 groups can be replaced by a chelating ligand (OR.sup.2).sub.2.These compounds can be used for the metathesis of olefins in neat metathesizable olefin, as well as in solution, and require only the input of energy to be converted to active catalysts.

Abstract: Methods of using chiral catalysts for enantioselectively epoxidizing a prochiral olefin and for enantioselectively oxidizing a prochiral sulfide are disclosed. In accordance with one aspect of the invention, the catalyst used is a salen derivative which has the following general structure: ##STR1## In accordance with another aspect of the present invention is a method of producing an epoxychroman using a chiral catalyst. In accordance with this method, a chromene derivative, an oxygen atom source, and a chiral catalyst are reacted under such conditions and for such time as is needed to epoxidize said chromene derivative. In accordance with yet another aspect of this invention is a method of enantioselectively epoxidizing a cis-cinnamate derivative to make taxol or an analog thereof. In accordance with another aspect a method of disproportionation of hydrogen peroxide using the catalysts of the present invention is disclosed.

Abstract: Tungsten carboxylate compounds useful for coating interdigitated electrodes used in hydrogen sulfide gas sensors are disclosed. A method of coating electrodes with the compounds using a precise solution casting technique such as spin-coating or casting, dip-casting or spray-casting techniques is also described. Electrodes which are solution coated with the compounds may be used to fabricate superior quality chemiresistor sensors for use in hydrogen sulfide gas sensing devices by heating the carboxylates above 350.degree. C. to decompose certain carboxylates to WO.sub.3 and others to sodium tungstate.

Abstract: A process for the preparation of a compound of the formula III ##STR1## comprising, deprotonating a solution or suspension of an indene of the formula I ##STR2## in a solvent or solvent mixture containing a base to give a suspension of a metallated product of the compound of formula I,adding to the suspension of the metallated product a compound of the formula IIX--R.sup.6 --X (II)and reacting the suspension of the metallated product and compound of the formula II.

Abstract: Mineral absorption is promoted in warm-blooded animals by means of a class of 1,2-disubstituted aromatic mineral chelates wherein the 1 and 2 substituents each donates a pair of electrons to a metal ion for formation of a five-member chelate ring. 2-Alkoxyphenols are particularly preferred. The chelates contain from one to three alkoxyphenol ligands, with two ligands being preferred. A preferred alkoxyphenol is vanillin, and the minerals are selected from the group consisting of Mg, Ca, Cr, Mn, Fe, Co, Cu, Zn, Mo, and Se. Vanillin metal chelates have a slight to neutral taste, and are absorbed more readily than inorganic mineral salts.