期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 27, 期 32, 页码 8273-8276出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202100877
关键词
boron; hydrosilylation; Lewis acids; silicon; silylium ions
资金
- Berlin Graduate School of Natural Sciences and Engineering
- Projekt DEAL
The hydrosilylation of ketenes promoted by boron Lewis acid catalyst accelerates the reaction with hydrosilanes, providing access to a new class of aldehyde-derived silyl enol ethers. Moderate to high yields are obtained, with a preference for Z configuration.
Little-explored hydrosilylation of ketenes promoted by main-group catalysts is reported. The boron Lewis acid tris(pentafluorophenyl)borane accelerates the slow uncatalyzed reaction of ketenes and hydrosilanes, thereby providing a convenient access to the new class of beta,beta-di- and beta-monoaryl-substituted aldehyde-derived silyl enol ethers. Yields are moderate to high, and Z configuration is preferred. The corresponding silyl bis-enol ethers are also available when using dihydrosilanes. The related trityl-cation-initiated hydrosilylation involving self-regeneration of silylium ions is far less effective.
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