A novel K2O and La2O3 promoted nickel catalyst supported on a-Al2O3 was prepared by co-impregnation method, and it exhibited higher activity and 6-aminocapronitrile selectivity than Ni/a-Al2O3 during the hydrogenation...A novel K2O and La2O3 promoted nickel catalyst supported on a-Al2O3 was prepared by co-impregnation method, and it exhibited higher activity and 6-aminocapronitrile selectivity than Ni/a-Al2O3 during the hydrogenation of adiponitrile in the absence of ammonia, i.e., K2O and La2O3 improved the performance of the nickel-based catalyst.展开更多
Highly enantioselective Rh-catalyzed partial hydrogenation of unprotected simple 2-alkyl-5-aryl-disubstituted pyrroles has been successfully developed,generating a series of chiral 1-pyrroline derivatives generally wi...Highly enantioselective Rh-catalyzed partial hydrogenation of unprotected simple 2-alkyl-5-aryl-disubstituted pyrroles has been successfully developed,generating a series of chiral 1-pyrroline derivatives generally with excellent results(95%-99%yields,91%-96%ee).Moreover,2,5-aryl-1H-pyrroles were hydrogenated well in high yields and good enantioselectivities.This efficient protocol features easily accessible substrates,wide substrate scope,well functional group compatibility,commercially available rhodium precursor and chiral ligand.It provides a versatile route to access chiral 1-pyrroline derivatives that are of great importance in organic synthesis and pharmaceutical chemistry.展开更多
文摘A novel K2O and La2O3 promoted nickel catalyst supported on a-Al2O3 was prepared by co-impregnation method, and it exhibited higher activity and 6-aminocapronitrile selectivity than Ni/a-Al2O3 during the hydrogenation of adiponitrile in the absence of ammonia, i.e., K2O and La2O3 improved the performance of the nickel-based catalyst.
基金support from the National Natural Science Foundation of China(No.22071187)the Natural Science Foundation of Jiangsu Province(No.BK20190213)the Natural Science Foundation of Hubei Province(Nos.2020CFA036,2021CFA069).
文摘Highly enantioselective Rh-catalyzed partial hydrogenation of unprotected simple 2-alkyl-5-aryl-disubstituted pyrroles has been successfully developed,generating a series of chiral 1-pyrroline derivatives generally with excellent results(95%-99%yields,91%-96%ee).Moreover,2,5-aryl-1H-pyrroles were hydrogenated well in high yields and good enantioselectivities.This efficient protocol features easily accessible substrates,wide substrate scope,well functional group compatibility,commercially available rhodium precursor and chiral ligand.It provides a versatile route to access chiral 1-pyrroline derivatives that are of great importance in organic synthesis and pharmaceutical chemistry.
