Application of chiral thiazolidine ligands to asymmetric hydrosilation
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Seven chiral thiazolidines bound rhodium complexes were synthesized and their catalytic asymmetric hydrosilation properties were investigated. It was found through investigation that the configuration of newly formed chiral centre C 2 * of substituted chiral thiazolidines prepared from L-cysteine or its esters has no effect on the final results of catalytic asymmetric hydrosilation. The direct reason for causing this phenomenon is reported by the present quantitative results for the first time: the rapid racemation of chiral center C 2 * of chiral thiazolidine ligands takes place under the catalysis of rhodium(I) complex [Rh(COD)Cl]2.
Keywordsasymmetric hydrosilation chiral thiazolidine ligands chiral rhodium(I) complex acetophenone α-phenylethanol
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