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US06677461B2 Ligands and asymmetric catalysts made by using the same 失效
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Ligands and asymmetric catalysts made by using the same
摘要:
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.
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