Abstract: The present invention relates to the technical field of chiral synthesis, and specifically provides the synthesis and use of a new type of oxa-spirodiphosphine ligands. The bisphosphine ligand is prepared with oxa-spirobisphenol as a starting material after triflation, palladium catalyzed coupling with diaryl phosphine oxide, reduction of trichlorosilane, further palladium catalyzed coupling with diaryl phosphine oxide, and further reduction of trichlorosilane. The oxa-spiro compound has central chirality, and thus includes L-oxa-spirodiphosphine ligand and R-oxa-spirodiphosphine ligand. The racemic spirodiphosphine ligand is capable of being synthesized from racemic oxa-spirobisphenol as a raw material. The present invention can be used as a chiral ligand in the asymmetric hydrogenation of unsaturated carboxylic acids. The complex of the ligand with ruthenium can achieve an enantioselectivity of greater than 99% in the asymmetric hydrogenation of methyl-cinnamic acid.

Abstract: The present invention relates to the technical field of chiral synthesis, and specifically provides a new type of oxa-spirodiphosphine ligands. The bisphosphine ligand is prepared with oxa-spirobisphenol as a starting material after triflation, palladium catalyzed coupling with diaryl phosphine oxide, reduction of trichlorosilane, further palladium catalyzed coupling with diaryl phosphine oxide, and further reduction of trichlorosilane. The oxa-spiro compound has central chirality, and thus includes L-oxa-spirodiphosphine ligand and R-oxa-spirodiphosphine ligand. The racemic spirodiphosphine ligand is capable of being synthesized from racemic oxa-spirobisphenol as a raw material. The present invention can be used as a chiral ligand in the asymmetric hydrogenation of unsaturated carboxylic acids. The complex of the ligand with ruthenium can achieve an enantioselectivity of greater than 99% in the asymmetric hydrogenation of methyl-cinnamic acid.

Abstract: The present invention provides an oxa-spirodiphosphine ligand having a structure of general Formula (I) below: wherein in general Formula (I), R1, R2, R3 and R4 are the same, and are alkyl, alkoxy, aryl, aryloxy, or hydrogen, in which R1, R2, R3 and R4 may or may not form a ring, any two of them may form a ring, or a polycyclic ring may be formed between two pairs of them; R5 and R6 is alkyl, aryl, or hydrogen; and R7 and R8 is alkyl, benzyl, or aryl. The present invention also provides a method for asymmetric hydrogenation of ?,?-unsaturated carboxylic acids. A complex of the oxa-spirodiphosphine ligand with ruthenium shows excellent activity and enantioselectivity in the asymmetric hydrogenation of various ?,?-unsaturated carboxylic acids, with which a chiral carboxylic acid product can be obtained with an enantioselectivity up to 99%.

Abstract: The present invention relates to the technical field of chiral synthesis, and specifically provides a new type of oxa-spirodiphosphine ligands. The bisphosphine ligand is prepared with oxa-spirobisphenol as a starting material after triflation, palladium catalyzed coupling with diaryl phosphine oxide, reduction of trichlorosilane, further palladium catalyzed coupling with diaryl phosphine oxide, and further reduction of trichlorosilane. The oxa-spiro compound has central chirality, and thus includes L-oxa-spirodiphosphine ligand and R-oxa-spirodiphosphine ligand. The racemic spirodiphosphine ligand is capable of being synthesized from racemic oxa-spirobisphenol as a raw material. The present invention can be used as a chiral ligand in the asymmetric hydrogenation of unsaturated carboxylic adds. The complex of the ligand with ruthenium can achieve an enantioselectivity of greater than 99% in the asymmetric hydrogenation of methyl-cinnamic acid.

Abstract: A homogeneous catalytic reaction method and a catalyst for isomerization and hydroformylation of long-chain internal olefins are disclosed. A rhodium-ruthenium metal complex is used as a catalyst; and the ligands are tetradentate phosphine ligands. By means of the catalytic system, homogeneous internal olefin isomerization aid hydroformylation can be performed under a certain temperature and pressure to obtain aldehyde products having high normal to iso ratios. The present invention is applicable to not only long-chain internal olefins (?C8) but also internal olefins having a carbon number less than 8.

Abstract: A homogeneous catalytic reaction method and a catalyst for isomerization and hydroformylation of long-chain internal olefins are disclosed. A rhodium-ruthenium metal complex is used as a catalyst; and the ligands are tetradentate phosphine ligands. By means of the catalytic system, homogeneous internal olefin isomerization aid hydroformylation can be performed under a certain temperature and pressure to obtain aldehyde products having high normal to iso ratios. The present invention is applicable to not only long-chain internal olefins (?C8) but also internal olefins having a carbon number less than 8.

Abstract: A ligand having the structure or its enantiomer; (I) wherein: each one of Ra, Rb, Rc and Rd is selected from alkyl, cycloalkyl, and aryl; the bridge group is selected from CH2NH; *CH(CH3)NH(C*,R); and the organocatalyst is an organic molecule catalyst covalently bound to the bridge group. Also, a catalyst having the structure or its enantiomer: (II) wherein: each one of Ra, Rb, Rc and Rd is selected from alkyl, cycloalkyl, and aryl; the bridge group is selected from CH2NH; *CH(CH3)NH(C*,R); and *CH(CH3)NH(C*,S); the organocatalyst is an organic molecule catalyst covalently bound to the bridge group; and M is selected from the group consisting of Rh, Pd, Cu, Ru, Ir, Ag, Au, Zn, Ni, Co, and Fe.

Abstract: A ligand having the structure or its enantiomer; (I) wherein: each one of Ra, Rb, Rc and Rd is selected from alkyl, cycloalkyl, and aryl; the bridge group is selected from CH2NH; *CH(CH3)NH(C*,R); and the organocatalyst is an organic molecule catalyst covalently bound to the bridge group. Also, a catalyst having the structure or its enantiomer: (II) wherein: each one of Ra, Rb, Rc and Rd is selected from alkyl, cycloalkyl, and aryl; the bridge group is selected from CH2NH; *CH(CH3)NH(C*,R); and *CH(CH3)NH(C*,S); the organocatalyst is an organic molecule catalyst covalently bound to the bridge group; and M is selected from the group consisting of Rh, Pd, Cu, Ru, Ir, Ag, Au, Zn, Ni, Co, and Fe.

Abstract: The present invention provides a chiral ligand, represented by a formula or its enantiomer: X and X? can be independently O, NH, NR, NCOR or S; each of Z1-Z7 and Z1?-Z7? can be independently H, alkyl, aryl, substituted alkyl, substituted aryl, alkoxyl, aryloxyl, nitro, amide, aryoxide, halide, hydroxyl, carboxylate, hetereoaryl, or a cyclic alkene, fused aryl, or cyclic ether group formed from any two adjacent Z groups or any two adjacent Z? groups; Y and Y? can be independently OH, OR, NH2, NHR, NR2, SH, PR2, OPR2, NHPR2, OP(OR)2, COOH, COOR, CONHR, or a linking group formed from Y and Y? groups together. Processes of preparing these ligands, catalysts that employ them and methods of using the catalysts are also provided.

Abstract: Phosphine triazole ligand compounds, prepared through click chemistry, complex with transition metals to form transition metal-phosphine triazole ligand complexes. These complexes are useful catalysts in coupling reactions such as Suzuki-Miyaura coupling, Stille coupling, Negishi coupling, Sonagashira coupling, carbon-heteroatom bond-forming reactions (C—O and C—N), alpha alkylation of carbonyls, Heck coupling reactions, and hydrogenation reactions.

Abstract: Tetraphosphorous ligands are combined with transition metal salts to form catalysts for use in hydroformylation, isomerization-hydroformylation, hydrocarboxylation, hydrocyan-ation, isomerization-formylation, hydroaminomethylation and similar related reactions.

Abstract: The present invention provides a chiral ligand, represented by a formula or its enantiomer: X and X? can be independently O, NH, NR, NCOR or S; each of Z1-Z7 and Z1?-Z7? can be independently H, alkyl, aryl, substituted alkyl, substituted aryl, alkoxyl, aryloxyl, nitro, amide, aryloxide, halide, hydroxyl, carboxylate, heteroaryl, or a cyclic alkene, fused aryl, or cyclic ether group formed from any two adjacent Z groups or any two adjacent Z? groups; Y and Y? can be independently OH, OR, NH2, NHR, NR2, SH, PR2, OPR2, NHPR2, OP(OR)2, COOH, COOR, CONHR, or a linking group formed from Y and Y? groups together. Processes of preparing these ligands, catalysts that employ them and methods of using the catalysts are also provided.

Abstract: Tetraphosphorous ligands are combined with transition metal salts to form catalysts for use in hydroformylation, isomerization-hydroformylation, hydrocarboxylation, hydrocyan-ation, isomerization-formylation, hydroaminomethylation and similar related reactions.

Abstract: A chiral ligand represented by the formula and its enantiomer: wherein A, X, Y and Z are as defined in the specification is provided. Also provided is a process of making the chiral ligands and catalysts prepared from these ligands and a transition metal, a salt thereof or a complex thereof. In addition, a method of preparing an asymmetric compound by a transition metal catalyzed asymmetric reaction, such as, hydrogenation, hydride transfer reaction, hydrosilylation, hydroboration, hydrovinylation, hydroformylation, hydrocarboxylation, allylic alkylation, epoxidation, cyclopropanation, Diels-Alder reaction, Aldol reaction, ene reaction, Heck reaction and Michael addition is provided.

Abstract: Tetraphosphorous ligands are combined with transition metal salts to form catalysts for use in hydroformylation, isomerization-hydroformylation, hydrocarboxylation, hydrocyan-ation, isomerization-formylation, hydroaminomethylation and similar related reactions.

Abstract: The present invention provides a chiral ligand, represented by a formula or its enantiomer: X and X? can be independently O, NH, NR, NCOR or S; each of Z1-Z7 and Z1?-Z7? can be independently H, alkyl, aryl, substituted alkyl, substituted aryl, alkoxyl, aryloxyl, nitro, amide, aryloxide, halide, hydroxyl, carboxylate, heteroaryl, or a cyclic alkene, fused aryl, or cyclic ether group formed from any two adjacent Z groups or any two adjacent Z? groups; Y and Y? can be independently OH, OR, NH2, NHR, NR2, SH, PR2, OPR2, NHPR2, OP(OR)2, COOH, COOR, CONHR, or a linking group formed from Y and Y? groups together. Processes of preparing these ligands, catalysts that employ them and methods of using the catalysts are also provided.

Abstract: Tetraphosphorous ligands are combined with transition metal salts to form catalysts for use in hydroformylation, isomerization-hydroformylation, hydrocarboxylation, hydrocyan-ation, isomerization-formylation, hydroaminomethylation and similar related reactions.

Abstract: Cyclic ?-(acylamino)acrylate derivatives were hydrogenated using Ru-chiral phosphine ligand catalysts and thereafter converted to the corresponding cyclic ?-aminoacids in high yield and enantioselectivity according to the reaction scheme:

Abstract: Phosphine triazole ligand compounds, prepared through click chemistry, complex with transition metals to form transition metal-phosphine triazole ligand complexes. These complexes are useful catalysts in coupling reactions such as Suzuki-Miyaura coupling, Stille coupling, Negishi coupling, Sonagashira coupling, carbon-heteroatom bond-forming reactions (C—O and C—N), alpha alkylation of carbonyls, Heck coupling reactions, and hydrogenation reactions.

Abstract: Chiral ligands and metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The metal complexes according to the present invention are useful as catalysts in asymmetric reactions, such as, hydrogenation, hydride transfer, allylic alkylation, hydrosilylation, hydroboration, hydrovinylation, hydroformylation, olefin metathesis, hydrocarboxylation, isomerization, cyclopropanation, Diels-Alder reaction, Heck reaction, isomerization, Aldol reaction, Michael addition; epoxidation, kinetic resolution and [m+n] cycloaddition. Processes for the preparation of the ligands are also described.