Asymmetric hydrisilylation catalyzed by polymeric thiazolidine rhodium catalystswas conducted. Almost the same optical yields have been obtained when comb-shapedpolymeric ligands and their corresponding monomer comple...Asymmetric hydrisilylation catalyzed by polymeric thiazolidine rhodium catalystswas conducted. Almost the same optical yields have been obtained when comb-shapedpolymeric ligands and their corresponding monomer complexed rhodium cataltystswere used to asymmetric hydrosilylation of acetophenone. Optical yield of chira 1- methylbenzyl alcohol reaches as high as 71.5%. Temperature dependence of enantio- selective hydrosilylation of acetophenone was discussed.展开更多
The title ligand(A) was synthesized through condensation of 2-pyridine aldehydeand L-methyl cysteine hydrochloride. The isomers of (A) were separated by column chromatography. The in-situ prepared catalyst from (A) wi...The title ligand(A) was synthesized through condensation of 2-pyridine aldehydeand L-methyl cysteine hydrochloride. The isomers of (A) were separated by column chromatography. The in-situ prepared catalyst from (A) with [Rh(COD)CI]2 (COD:cyclooctadiene) has been used to catalyze the asymmetric hydrosilylation of acetophenone. The resultsshowed that only the configuration of C4, but not that of C2 affected the optical yield andconfiguration of the products.展开更多
文摘Asymmetric hydrisilylation catalyzed by polymeric thiazolidine rhodium catalystswas conducted. Almost the same optical yields have been obtained when comb-shapedpolymeric ligands and their corresponding monomer complexed rhodium cataltystswere used to asymmetric hydrosilylation of acetophenone. Optical yield of chira 1- methylbenzyl alcohol reaches as high as 71.5%. Temperature dependence of enantio- selective hydrosilylation of acetophenone was discussed.
文摘The title ligand(A) was synthesized through condensation of 2-pyridine aldehydeand L-methyl cysteine hydrochloride. The isomers of (A) were separated by column chromatography. The in-situ prepared catalyst from (A) with [Rh(COD)CI]2 (COD:cyclooctadiene) has been used to catalyze the asymmetric hydrosilylation of acetophenone. The resultsshowed that only the configuration of C4, but not that of C2 affected the optical yield andconfiguration of the products.
