There is provided a process for the de-enrichment of enantiomerically enriched compositions which comprises reacting an enantiomerically enriched composition comprising at least a first enantiomer or diastereomer of a substrate comprising a carbon-heteroatom bond, wherein the carbon is a chiral centre and the heteroatom is a group V heteroatom, in the presence of a catalyst system and optionally a reaction promoter to give a product composition comprising first and second enantiomers or diastereomers of the substrate having a carbon-heteroatom bond, the ratio of second to first enantiomer or diastereomer in the product composition being greater than the ratio of second to first enantiomer or diastereomer in the enantiomerically enriched composition. Preferred catalyst systems include transition metal halide complex of the formula M
n
X
p
Y
r
wherein M is a transition metal; X is a halide; Y is a neutral optionally substituted hydrocarbyl complexing group, a neutral optionally substituted perhalogenated hydrocarbyl complexing group, or an optionally substituted cyclopentadienyl complexing group; and n, p and r are integers. The reaction promoter is preferably a halide salt.
提供了一种去富集对映体的方法,包括在催化剂系统和可选的反应
促进剂存在下,反应一种包含至少一种底物的对映体富集组合物,所述底物包括一个碳-杂原子键,其中碳是手性中心,杂原子是V族杂原子,以得到一种产品组合物,其中包括底物的第一和第二对映体或二对映异构体,其碳-杂原子键的第二对第一对映体或对映异构体的比率大于对映体富集组合物中第二对第一对映体或对映异构体的比率。优选的催化剂系统包括配合物MnXpYr的过渡
金属卤化物,其中M是过渡
金属;X是卤化物;Y是中性的、可选的取代的羟烷基配位基团、中性的、可选的取代的
全氟烃基配位基团或可选的取代的
环戊二烯基配位基团;n、p和r是整数。反应
促进剂优选为卤化物盐。