期刊
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
卷 32, 期 8, 页码 2960-2964出版社
WILEY-V C H VERLAG GMBH
DOI: 10.5012/bkcs.2011.32.8.2960
关键词
Amines; Enantioselectiviy; Hydrosilylation; Imines; Zinc
资金
- National Research Foundation of Korea [NRF-20090085824]
The efficient asymmetric hydrosilylation of imines in the presence of polymethylhydrosiloxane has been investigated by screening chiral diamine-zinc complexes. A series of chiral diamine ligands were prepared from optically pure 1,2-dipheny1-1,2-ethanediamine and screened for effectiveness. N-Benzylic substituents were required for high enantioselectivity; ligands with bulky groups or extra coordinating groups such as OH and S lowered the catalytic activity. The level of asymmetric induction was usually in >90% ee range for aromatic imine substrates. A linear correlation between the ee of the ligand and that of the product was observed, indicating the presence of a 1:1 ratio of ligand to metal coordination in the active catalytic complex.
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