期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 8, 页码 2505-2509出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201813305
关键词
C-O bond cleavage; homogeneous catalysis; hydroboration; lanthanum hydride; saturation kinetics
资金
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences
- U.S. Department of Energy by Iowa State University [DE-AC02-07CH11358]
The high catalytic reactivity of homoleptic tris(alkyl) lanthanum La{C(SiHMe2)(3)}(3) is highlighted by C-O bond cleavage in the hydroboration of esters and epoxides at room temperature. The catalytic hydroboration tolerates functionality typically susceptible to insertion, reduction, or cleavage reactions. Turnover numbers (TON) up to 10 000 are observed for aliphatic esters. Lanthanum hydrides, generated by reactions with pinacolborane, are competent for reduction of ketones but are inert toward esters. Instead, catalytic reduction of esters requires activation of the lanthanum hydride by pinacolborane.
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