Intermolecular and Intramolecular, Platinum-Catalyzed, Acceptorless Dehydrogenative Coupling of Hydrosilanes with Aryl and Aliphatic Methyl C−H Bonds
作者:Naofumi Tsukada、John F. Hartwig
DOI:10.1021/ja050612p
日期:2005.4.1
Intermolecular acceptorless dehydrogenative coupling of silanes with arene C-H bonds and intramolecular coupling of silanes with aryl and alkyl C-H bonds occur in good yield in the presence of 5 mol % of TpMe2PtMe2H (TpMe2 = hydridotris(3,5-dimethylpyrazolyl)borate) and related platinum(IV) complexes. The intermolecular reactions of arenes occurred with both trialkyl and dialkylaryl silanes. Intramolecular reactions of dialkylsilylalkylarenes occurred at aryl C-H bonds, and reactions of tributylsilane or dibutylphenylsilane occurred intramolecularly at the aliphatic, primary C-H bond. The reactions of arenes occurred preferentially at the least sterically hindered C-H bonds and preferentially with more electron-poor arenes. Crossover experiments and the lack of reactivity of the arylsilanes with H2 imply that the dehydrogenative silylation of arenes can be irreversible, even in a closed reaction vessel.
Über die austauschbarkeit von methyl- und phenylgruppen am silicium von silacyclopentan bei der einwirkung von alkyl- und aryllithiumverbindungen in diethylether oder tetrahydrofuran
作者:Adalbert Maercker、Reinhard Stötzel
DOI:10.1016/0022-328x(84)80558-6
日期:1984.10
MAERCKER, A.;STOETZEL, R., J. ORGANOMET. CHEM., 1984, 273, N 3, C57-C63
作者:MAERCKER, A.、STOETZEL, R.
DOI:——
日期:——
Rhodium-Catalyzed Intramolecular Silylation of Unactivated C(sp<sup>3</sup>)–H Bonds
The treatment of a variety of hydrosilanes, each incorporating a benzylic C(sp3)–H bond, with a rhodium catalyst resulted in intramolecular dehydrogenativesilylation. This silylation reaction was found to occur at typically unreactive C(sp3)–H bonds located at terminal positions on alkyl chains. Interestingly, the rhodium catalyst also promoted regioselective silylation at a site internal to an alkyl