A tethered ligand comprising the reaction product of an organofunctional silica and a ligand containing a functional group capable of reaction with said organofunctional silica, wherein the organofunctional silica is prepared from an alkyl silicate and an organofunctional silane is described. A supported catalyst is also described comprising additionally a source of catalytically-active metal. Methods for preparing the tethered ligand and supported catalyst are provided and uses of the supported catalyst for performing asymmetric reactions are claimed. The catalysts are readily separable from the reaction mixtures and may be re-used if desired.
描述了一种被束缚的
配体,包括有机功能
硅和含有可与该有机功能
硅反应的功能基团的
配体的反应产物,其中有机功能
硅是由烷基
硅酸酯和有机功能
硅烷制备而成。还描述了一种支持催化剂,其另外包括催化活性
金属的来源。提供了制备被束缚
配体和支持催化剂的方法,并声称使用支持催化剂进行不对称反应的用途。这些催化剂可以轻松地与反应混合物分离,并且如果需要,可以被重复使用。