Abstract: The invention relates to a diphosphine of the following formulaR.sup.1 >P-R.sup.2 -PR.sup.3 R.sup.4wherein R.sup.2 represents a covalent bridging group, R.sup.1 represents a bivalent radical that together with the phosphorus atom to which it is attached is an optionally substituted 2-phospha-tricyclo[3.3.1.1{3,7}]decyl group or a derivative thereof in which one or more of the carbon atoms are replaced by heteroatoms ("6-PA" group), and wherein R.sup.3 and R.sup.4 independently represent univalent radicals of up to 20 atoms or jointly form a bivalent radical of up to 20 atoms; to carbonylation catalysts obtainable by combining: (i) a metal cation selected from the groups 8, 9 or 10 of the Periodic Table of Elements, and (ii) the new diphosphine; and furthermore to a process for carbonylating unsaturated compounds in the presence of the carbonylation catalyst.

Abstract: Novel reactions used to prepare phosphole and bisphosphole compounds are detailed. Novel phosphole compounds and metal coordination compounds of phosphole and bisphosphole compounds are also provided. These metal coordination compounds are useful as catalysts for the polymerization or olefins with carbon monoxide and for the polymerization of acrylic monomers.

Abstract: A new family of metallacycles, which are preferably zirconacycles, is characterized by having a unique halogenated substituent. The metallacycles are useful for the preparation of main group heterocycles, especially two novel families of heterocycles. The first new family of heterocycles preferably contains a halosilyl substituent. A preferred group of the second family of novel heterocycles contains a silyl group having a leaving group bonded thereto. The preferred group of these heterocycles is suitable for preparing novel organometallic complexes having a bridged bidentate heterocyclic ligand. These novel organometallic complexes may be used as catalyst components in olefin polymerization. The subject catalyst components are particularly well suited for use in the medium pressure solution process to prepare linear low density polyethylene.

Abstract: Phospholanes and diphospholanes of the formula I ##STR1## where: R.sup.1 and R.sup.2 are, independently of one another, C.sub.1 -C.sub.6 -alkyl, aryl, alkylaryl,R.sup.1 is also hydrogen,A is either R.sup.1 or ##STR2## B is a linker having 1-5 carbon atoms between the two phosphorus atoms, and their use as catalyst in asymmetric synthesis.

Abstract: The present invention relates to rigid chiral ligands usefull in making catalysts for asymmetric synthesis. More particularly, the present invention relates to new monodentate and bidentate cyclic chiral phosphine ligands which are formed into catalysts to provide high selectivity of the enantiomeric structure of the end-product.

Abstract: Methods and intermediates for the preparation of oligomers containing diastereomerically enriched phosphorothioate linkages are disclosed.

Abstract: This invention relates to chiral heterocyclic compounds useful for asymmetric synthesis and catalysis. More particularly, the invention relates to chiral heterocyclic phosphine, sulfur, and nitrogen compounds for asymmetric synthesis and catalysis in the production of enantiomerically pure products.

Abstract: The subject invention relates to phosphine ligands that are useful for asymmetric reactions, especially as chiral ligands for catalytic asymmetric hydrogenation.

Abstract: A process for preparing an organic pentavalent phosphorus compound comprising oxidizing an organic trivalent phosphorus compound with an aqueous hydrogen peroxide solution in the presence of an inorganic or organic base at a temperature of 0.degree. C. to 50.degree. C. to obtain the corresponding organic pentavalent phosphorus compound.

Abstract: A novel diphosphine compound of the formula (I): ##STR1## where R.sup.1 and R.sup.2 represent independently cycloalkyl, unsubstituted or substituted phenyl, or a five-membered heteroaromatic ring. The compound is useful as a ligand for an asymmetric reaction, in particular, as an asymmetric hydrogenation catalyst.

Abstract: The invention relates to a bidentate phosphine ligand, the phosphorus atoms of the phosphine being connected via a bridge group, the bridge group of the bidentate phosphine ligand consisting of an ortho-anellated annular system, comprising two aryl groups, which aryl groups are connected by two bridges, the first bridge consisting of an --O-- or an --S-- atom and the second bridge being a group that contains an oxygen, sulphur, nitrogen, silicon or carbon atom or a combination of these atoms, the two phosphorus atoms being connected to the two aryl groups of the bridge group at the ortho-position relative to the --O-- or --S-- atom of the first bridge.The invention also relates to the use of this bidentate phosphium ligand in a catalyst system comprising also a transition metal compound which is used in the following type of reactions: hydroformylation hydrogenation, hydrocyanation, polymerization, isomerisation, carboxylation, cross coupling and metathesis.

Abstract: Tertiary phosphines of the formula (I) ##STR1## in which X is a phosphinate or phosphonate group, are prepared by a palladium-catalyzed coupling of p-, m- or o-bromofluorobenzenes with alkyl akylphosphonous acid ester or alkyl alkylphosphite ester and reacting the resulting alkyl fluorophenylphosphinates or alkyl fluorophenylphosphonates with a metal phosphide.

Abstract: The present invention relates to optically active diphosphines. It is also targeted at their preparation according to a process for the resolution of the racemic mixture of the said phosphines to optically active isomers. The subject of the invention is new optically active bis?1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene!diphosphines and a process for resolving the racemic bis?1-phospha-2,3-diphenyl-4,5-dimethylnorbornadiene! mixture which comprises reacting it with a palladium or platinum complex as chiral auxiliary in an organic solvent, thus forming diastereoisomer complexes, and then resolving the said optically pure complexes. The invention also relates to new optically active metal complexes comprising the said phosphines and to their use in a process for the preparation of optically active carboxylic acids and/or derivatives according to a process for the hydrogenation of .alpha.,.beta.-unsaturated carboxylic acids and/or derivatives.

Abstract: Phosphines of the formula (I) and the preparation of these phosphines ##STR1## where Ar--Ar is a biphenyl radical, a 1-phenylnaphthyl radical or a 1,1'-binaphthyl radical, the CH.sub.2 group and the CH.sub.3 radical are each in the ortho position to the Ar--Ar bond, R is F, an alkyl radical or alkoxy radical each having from 1 to 8 carbon atoms, n is an integer from 0 to 4, R.sup.1 and R.sup.2 independently of one another, are an alkyl radical having from 1 to 10 carbon atoms, a cycloaliphatic radical having from 5 to 10 carbon atoms, or a radical Ar.sup.1 -(R.sup.3).sub.m, where Ar.sup.1 is a phenyl or naphthyl radical, R.sup.3 is F, Cl, CF.sub.3, SO.sub.3 H, SO.sub.3 Me (Me=Li, Na or K), a dialkylamino radical having from 2 to 8 carbon atoms, an alkyl radical or alkoxy radical each having from 1 to 8 carbon atoms and m is an integer from 0 to 5, or R.sup.1 and R.sup.2 together with the phosphorus atom form a 4-membered to 8-membered ring to which can be fused.

Abstract: Optically active phosphines of the general formula I or II ##STR1## where the variables have the following meanings: X is an optically active terpene radical,R is an unsubstituted or substituted phenyl radical,Y is a bridge member having 1-10 C atoms in the formula In is 1,2 or 3 andm is 0,1 or 2 with the proviso that n+m=3 in the formula IIn is 1 or 2 andm is 0 or 1 with the proviso that n+m=2, their preparation and use are described.

Abstract: Processes for hydrocyanation of nonconjugated acyclic aliphatic monoolefins, monoolefins conjugated to an ester group, or monoolefins conjugated to a nitrile group which utilize a catalyst precursor composition comprising a bidentate phosphite ligand and zero-valent nickel preferably in the presence of a Lewis acid promoter. Catalyst precursor compositions are also disclosed.

Abstract: The invention relates to bis-phosphepines of the formula (I): ##STR1## where: Ar--Ar is biphenyl, 1,1'-binaphthyl or 1-phenylnaphthyl,R.sup.1 independently of one another are F, (C.sub.1 -C.sub.8)-alkyl or (C.sub.1 -C.sub.8)-alkoxy,m is 0, 1, 2, 3 or 4,R.sup.2 and R.sup.3 independently of one another are H, (C.sub.1 -C.sub.20)-alkyl, (C.sub.6 -C.sub.20)-aryl, (C.sub.7 -C.sub.20)-aralkyl, (C.sub.7 -C.sub.20)-alkaryl or (C.sub.3 -C.sub.20)-cycloalkyl andR.sup.4 is (C.sub.1 -C.sub.10)-alkylene, it also being possible for the alkylene chain to contain oxygen atoms and N-alkyl groups, (C.sub.3 -C.sub.10)-cycloalkylene, (C.sub.8 -C.sub.22)-arylene-bisalkyl or (C.sub.6 -C.sub.10)-arylene,the group CR.sup.2 R.sup.3 always being adjacent to the Ar--Ar bond.The invention further relates to processes for the preparation of compounds of the formula (I).

Abstract: The bisphosphonates of formula (III)R.sub.2 --X--(CW).sub.m1 --CR.sub.3 R.sub.4 --CH.sub.2 --CM[PO--(OR.sub.1).sub.2 ].sub.2 (III)bicyclic bisphosphonates (V), and cyclic bisphosphonates (VII) are useful as antiarthritic agents and do not have the side effects of anti-arthritic agents which are prostaglandin synthetase inhibitors.

Abstract: Novel chiral 1,4-diol cyclic sulfates and their use as precursors in the preparation of chiral phospholane ligands, and chiral complexes useful as catalysts for carrying out enantioselective reactions.

Abstract: This invention relates to substituted bicyclic phosphoramides and derivatives thereof, useful as retroviral protease inhibitors and as standards and reagents in determining the ability of a potential pharmaceutical to inhibit viral replication or HIV protease, to pharmaceutical compositions comprising such compounds, and to methods of using these compounds for treating viral infection.

Abstract: A process for the asymmetric hydrogenation of N-acylhydrazones to optically active N-acylhydrazines in the presence of a chiral phospholane catalyst complex, a process for the reductive N--N bond cleavage of N-acylhydrazine to amines with samarium diiodide, and a multistep process for converting keto group-bearing compounds to the corresponding optically active amino group-bearing compounds are disclosed.

Abstract: This invention relates to novel chiral 1,4-diol cyclic sulfates and their use as precursors in the preparation of chiral phospholane ligands, and chiral complexes useful as catalysts for carrying out enantioselective reactions.

Abstract: Compounds represented by general formula (I), herbicides or selective herbicides for paddy field containing said compounds as active ingredients, method of controlling growth of undesirable plants by applying the herbicides on places where control is desired. ##STR1## wherein A represents a --S(O)nR.sup.1 in which n is 0 or 2 and R.sup.1 represents a (substituted) lower alkyl; a cycloalkyl; a (substituted) benzyl; a (substituted) phenyl; or a --OR.sup.2 in which R.sup.2 represents a (substituted) phenyl;B represents a halogen, a nitro, a lower alkyl, or a lower alkylsulfonyl;D represents a hydrogen, a lower alkyl, a lower alkoxy, a lower alkoxymethyl, or a lower alkoxycarbonyl;E represents a halogen, a (substituted) lower alkoxy, a lower alkylthio, a (substituted) lower alkylsulfonyl, or a lower alkylsulfonyloxy.The herbicides of the present invention can prevent a wide variety of noxious weeds and further selectively prevent weeds on paddy field with considerably reduced phytotoxicities on rice plant.

Abstract: The present invention is concerned with novel optically active phosphorus compounds of the general formula ##STR1## wherein R and R.sup.1 each independently signify hydroxy, a protected hydroxy group, lower alkyl or lower alkoxy andR.sup.2 to R.sup.5 each independently signify alkyl with 3 to 7 carbon atoms, cycloalkyl or aryl or R.sup.2 and R.sup.3 or R.sup.4 and R.sup.5 together with the phosphorus form a group of the formula ##STR2## wherein R2 and R3 are different when R4 and R5 are the same, and R4 and R5 are different when R2 and R3 are the same,the manufacture of such compounds, their use for enantioselective reactions, such as, e.g., asymmetric hydrogenations, enantioselective hydrogen displacements in prochiral allylic systems and the like, as well as complexes of the compounds of formula I with Group VIII metals.

Abstract: Novel, racemic and optically active phosphorus compounds of the formula ##STR1## wherein R signifies lower alkyl, lower alkoxy, hydroxy or a protected hydroxy group, R.sup.1 and R.sup.2 are different from each other and represent lower alkyl, cycloalkyl, aryl, a five-membered heteroaromatic or a group of the formula ##STR2## are described. The compounds of formula I are useful in the form of complexes with a metal of Group VIII as catalysts for asymmetric hydrogenations and for enantioselective hydrogen displacements in prochiral allylic systems.

Abstract: A process for producing 3-methyl-1-phenylphospholene oxide by subjecting dichlorophenylphosphine and isoprene to an addition reaction and then subjecting the resulting adduct to solvolysis, wherein the addition reaction between dichlorophenylphosphine and isoprene is conducted in a solvent to obtain an adduct in the form of a slurry or solution and the slurry or solution is subjected to solvolysis.This process can easily produce 3-methyl-1-phenylphospholene oxide which is used in various reactions, and is free from the drawbacks of the conventional process.

Abstract: Novel racemic and optically active phosphorus compounds of the formula ##STR1## wherein R signifies hydroxy or a protected hydroxy group, R.sup.1 represents hydroxy, a protected hydroxy group or lower alkoxy and R.sup.2 represents lower alkyl, cycloalkyl, aryl or together with the phosphorus atom a group of the formula are described. The compounds of formula I are useful in the form of complexes with a metal of Group VIII as catalysts for asymmetric hydrogenations and for enantioselective hydrogen displacements in parochial, allylic systems.

Abstract: A process for the asymmetric hydrogenation of N-acylhydrazones to optically active N-acylhydrazines in the presence of a chiral phospholane catalyst complex, a process for the reductive N--N bond cleavage of N-acylhydrazine to amines with samarium diiodide, and a multistep process for converting keto group-bearing compounds to the corresponding optically active amino group-bearing compounds are disclosed.

Abstract: Compounds of formula I ##STR1## wherein n is 0 or 1, p is a number from 1 to 8,q is 2 or 3, andR.sub.1 is unsubstituted phenyl or phenyl which is substituted by one to three halogen, C.sub.1 -C.sub.8 alkyl, C.sub.1 -C.sub.8 alkoxy, C.sub.2 -C.sub.8 alkoxyalkyl or/and C.sub.1 -C.sub.4 alkylthio, are suitable for use as initiators for photopolymerising compounds containing ethylenically unsaturated double bonds.

Abstract: This invention relates to novel chiral 1,4-diol cyclic sulfates and their use as precursors in the preparation of chiral phospholane ligands, and chiral complexes useful as catalysts for carrying out enantioselective reactions.

Abstract: Chiral 2,5-disubstituted phospholanes useful as transition metal ligands in asymmetric catalysis and processes for their preparation are disclosed.

Abstract: Chiral tridentate bis(phospholanes) which coordinate as ligands in a meridinal fashion on an octahedral metal or which coordinate in square-planar environments are provided with a method for their preparation.

Abstract: A process for the formation of pentaerythritol-based phosphorus heterocycles comprises the reaction of a pentaerythritol polyol, e.g., pentaerythritol, with a trivalent or pentavalent phosphorus compounds, e.g., a phosphorus oxytrihalide, a triorganophosphite, or a phosphorus trihalide, in an aryl phosphate solvent at elevated temperature.

Abstract: Compounds of formula I ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each 2-ethylhexyl or are independently higher alkyl, or R.sub.1 and R.sub.2 are independently hydrogen or methyl, and R.sub.3 and R.sub.4 are independently higher alkyl are effective processing stabilizers for polymers processed at elevated temperatures by preventing polymer degradation and providing resistance to discoloration. The compounds of formula I also exhibit superior hydrolytic stability and resist moisture pickup on storage.

Abstract: Polymers of carbon monoxide with one or more olefinically unsaturated compounds are prepared by contacting the monomers with a palladium phosphorus bidentate catalyst in which at least one of the phosphorus atoms of the bidentate forms part of a 9-phosphabicyclononyl structure.

Abstract: Chiral 2,5-disubstituted phospholanes useful as transition metal ligands in asymmetric catalysis and processes for their preparation are disclosed.

Abstract: Chiral tridentate bis(phospholanes) which coordinate as ligands in a meridinal fashion on an octahedral metal or which coordinate in square-planar environments are provided with a method for their preparation.

Abstract: Chiral 2,5-disubstituted phospholanes useful as transition metal ligands in asymmetric catalysis and processes for their preparation are disclosed.

Abstract: This invention relates to novel chiral 1,4-diol cyclic sulfates and their use as precursors in the preparation of chiral phospholane ligands, and chiral complexes useful as catalysts for carrying out enantioselective reactions.

Abstract: Various 1,4-disubstituted-2,3,5,6-tetrahydroxy-1,4-diphosphorinanes, their oxides and sulfides, methods for the production thereof, flame-retarded compositions of matter containing them and froth flotation processes therewith, are disclosed.

Abstract: Various 1,4-disubstituted-2,3,5,6-tetrahydroxy-1,4-diphosphorinanes, their oxides and sulfides, methods for the production thereof, flame-retarded compositions of matter containing them and froth flotation processes therewith, are disclosed.

Abstract: Diaryl sulphides and diaryl selenides of formula:Ar--X--Arwhere X=S or Se and Ar=aryl are made by the action of sulphur and sulphur dioxide or selenium and selenium dioxide on a compound of formula:Ar--HThe process is especially useful for the preparation of phenothiazines of formula ##STR1## in which X=S or Se and Z and Z.sub.1, which may be identical or different, are each hydrogen, halogen, alkyl or alkoxy.

Abstract: Chiral 2,5-disubstituted phospholanes useful as transition metal ligands in asymmetric catalysis and processes for their preparation are disclosed.

Abstract: Various 1,4-disubstituted-2,3,5,6-tetrohydroxy-1,4-diphosphorinanes, their oxides and sulfides, methods for the production thereof, and flame-retarded compositions of matter containing them, are disclosed.

Abstract: This invention relates to aryloxy dihydrobenzofuran, oxoindole or benzofuranone derivatives having herbicidal activity and to the use of such compounds to control the growth of noxious plants, i.e., weeds.

Abstract: Cyclic chlorophosphites of ortho-bridged phenols are made by reaction of an ortho-bridged bisphenol with PCl.sub.3 in an inert solvent using a catalytic amount of a polymeric compound having a pyridine skeletal structure and a cross-linked structure to promote the reaction.

Abstract: Various 1,4-disubstituted-2,3,5,6-tetrahydroxy-1,4-diphosphorinanes, their oxides and sulfides, methods for the production thereof, and flame-retarded compositions of matter containing them, are disclosed.

Abstract: Novel 10,10-Dihydro-10-[(substituted carbonyl)imino]-10-phenyl-10H-phenoxaphines of the formula: ##STR1## wherein A is selected from the group consisting of hydrogen and COOR.sub.1, where, when A is hydrogen the compound is in the form of a water soluble salt HnX, where n is an integer 1 or 2 and X is selected from the group consisting of sulfate, trefluoroacetate, bromide and chloride and R.sub.1 is selected from the group consisting of straight or branched chain alkyl(C.sub.1 -C.sub.4), alkenyl(C.sub.2 -C.sub.4), alkynyl(C.sub.2 -C.sub.4), cycloalkyl(C.sub.3 -C.sub.6), cycloalkyl(C.sub.3 -C.sub.6)methyl, benzyl, pyridylmethyl and tetrahydro-3-furanyl; methods for using these compounds for effecting diuresis, treating hypertension and edema and lowering plasma renin activity in mammals; pharmaceutical compositions of matter containing these compounds and processes for their preparation.

Abstract: Branched phosphorus-containing polyarylene ethers comprising repeating units of the structure ##STR1## wherein q and z are 0 or 1; andm has an average value from 1 to 10,statistically alternating with branching points units of the structures ##STR2## p being an integer from 1 to 4, and methods for making such ethers by polycondensing appropriate aromatic bifunctional compounds in the presence of further condensable compounds having more than two reactive groups.

Abstract: The present invention relates to a process for preparing a finely divided, highly reactive magnesium from magnesium hydride, magnesium anthracene and/or its derivatives or magnesium butadiene and/or its alkyl or phenyl derivatives, which process is characterized in that the respective magnesium-containing compound is thermally decomposed at a pressure from 10.sup.