.alpha., .beta.-Unsaturated acids of the formula ##STR1## wherein R.sup.1 signifies C.sub.1 -C.sub.5 -alkyl and Ar signifies an aryl group which is optionally substituted by one or more substituents selected from the group consisting of halogen, phenyl, C.sub.1 -C.sub.5 -alkyl, C.sub.1 -C.sub.5 -alkoxy, perfluorinated C.sub.1 -C.sub.5 -alkyl or perfluorinated C.sub.1 -C.sub.5 -alkoxy can be obtained from new or known compounds of the formula ##STR2## Compounds I can be converted by asymmetric hydrogenation into corresponding optically active saturated acids.
α,β-不饱和酸的
化学式为##
STR1##其中R.sup.1表示C.sub.1-C.sub.5-烷基,Ar表示芳基,可以选择性地被来自卤素、
苯基、C.sub.1-C.sub.5-烷基、C.sub.1-C.sub.5-烷
氧基、
全氟C.sub.1-C.sub.5-烷基或
全氟C.sub.1-C.sub.5-烷
氧基的一个或多个取代基所取代。可以从新的或已知的化合物的
化学式##
STR2##中获得化合物I。化合物I可以通过不对称
氢化转化为相应的光学活性饱和酸。