| 摘要 |
NEW MATERIAL:The compound of formula I [R<1> is phenyl or (substituted) allyl; R<2> is cyclohexyl or alkyl; R<1> is not R<2>]. EXAMPLE:(-)-[(4R,5R)-2,2-dimethyl-1,3-dioxolan-4-ylmethyl(dicyclohexyl )-5-ylme thyl(diphenyl)]bisphosphine. USE:An industrial catalyst for asymmetric hydrogenation reaction, asymmetric isomerization reaction, etc. PREPARATION:The compound of formula I can be produced e.g. by thermally reacting L-(+)-tartaric acid diethyl ester, acetone and p-toluenesulfonic acid in a solvent to obtain a compound of formula II (Et is ethyl), reducing the compound, reacting the product successively with benzyl bromide, p- toluenesulfonyl chloride and chlorodiphenylphosphine, hydrolyzing the resultant compound of formula III and reacting with chlorodicyclohexyl-phosphine, etc., in the same manner.
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