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US 6,677,461 B2Granted
Ligands and asymmetric catalysts made by using the same
AssigneeJapan as Represented by the President of the University of Tokyo
InventorsMasakatsu Shibasaki, Motomu Kanai, Yoshitaka Hamashima
Life of this patent
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Abstract
A ligand expressed by a general formula (1) in claim 1, wherein R1, R2 and R3 denote substituting groups on aromatic rings, X is P or As, and n is 1 to 3.
Claims9
A ligand expressed by a general formula (1):
- in which R1, R2 and R3 are selected from alkyl, ether, amine and ester, X is P or As, and n is 1 to 3.
Ligand expressed by a general formula (2):
- in which R1, R2 and R3 are selected from alkyl, ether, amine and ester, R4 is an electron-withdrawing group, X is P or As, and n is 1 to 3.
Dependencies are inferred from the claim text.