期刊
CANADIAN JOURNAL OF CHEMISTRY
卷 92, 期 6, 页码 462-470出版社
CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
DOI: 10.1139/cjc-2013-0532
关键词
germene; alkyne; cycloaddition; mechanism
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- University of Western Ontario
- King Abdul Aziz University (Saudi Arabia)
A variety of terminal alkynes were added to dimesitylfluorenylidenegermane, Mes(2)Ge=CR2 (where CR2 = fluorenylidene). The addition of phenylacetylene and 1-hexyne to Mes(2)Ge=CR2 gave a germacyclohexene via a cycloaddition where the germene acts as the 4 pi component and the alkyne as the 2 pi component. Through the use of a mechanistic probe, trans-(2-phenylcyclopropyl)-acetylene, the reaction was postulated to proceed through a concerted [2+4] cycloaddition. The addition of ethoxyacetylene to the germene produced both a [2+2] cycloadduct, a germacyclobutene, and a [2+4] cycloadduct, a germacyclohexene. The results of this study are compared to the results of the addition of alkynes to Mes(2)Ge=CHCH2-t-Bu.
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