期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 129, 期 47, 页码 14684-14696出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja074477n
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资金
- NIGMS NIH HHS [R01 GM074774] Funding Source: Medline
This work details an in-depth evaluation of an unprecedented mechanism for the hydrosilylation of carbonyl compounds catalyzed by (PPh3)(2)Re(O)(2)I. The proposed mechanism involves addition of a silane Si-H bond across one of the rhenium-oxo bonds to form siloxyrhenium hydride intermediate 2 that reacts with a carbonyl substrate to generate siloxyrhenium alkoxide 4, which, in turn, affords the silyl ether product. Compelling evidence for the operation of this pathway includes the following: (a) isolation and structural characterization by X-ray diffraction of siloxyrhenium hydricle intermediate 2, (b) demonstration of the catalytic competence of intermediate 2 in the hydrosilylation reaction, (c) H-1 and 31P{H-1} NMR and ESI-MS evidence for single-turnover conversion of 2 into 1, (d) observation of intermediate 2 in the working catalyst system, and (e) kinetic analysis of the catalytic hydrosilylation of carbonyl compounds by 1.
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