Alkene metathesis catalysed by [WBr2(CO)2(dienel)]/AlCl2Et

Jack L. Davidson, Giuseppe Vasapollo, C. Francesco Nobile, Adriano Sacco

Research output: Contribution to journalArticle

Abstract

[WBr2(CO)2(diene)]/AlCl2Et mixtures promote metathesis of cis-2-pentene to give 2-butene and 3-hexene. For diene = norbornadiene the reaction is catalytic, and is accompanied by cis to trans isomerisation of the 2-pentene, whereas for diene = 1,5-cyclooctadiene or cyclooctatetraene the metathesis is essentially stoicheiometric. The same complexes catalyze the metathesis of trans-2-pentene to give 2-butene and 3-hexene, but at approximately twice the rate observed for the cis-alkene. [WBr2(CO)2(diene)]/AlCl2Et mixtures also catalyse the metathesis of 1,7-octadiene to give cyclohexene and ethene. The intermediacy of metal carbene derivatives in such reactions is supported by the reactions of [WBr2(CO)2(norbornadiene)] with alkylating agents SiMe4 and MeMgBr which give methane, whereas [WBr2(CO)2(norbornadiene)] and AlCl2Et in the absence of alkenes gave virtually stoicheiometric amounts of ethane. © 1989.

Original languageEnglish
Pages (from-to)297-302
Number of pages6
JournalJournal of Organometallic Chemistry
Volume371
Issue number3
Publication statusPublished - 1 Aug 1989

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    Davidson, J. L., Vasapollo, G., Nobile, C. F., & Sacco, A. (1989). Alkene metathesis catalysed by [WBr2(CO)2(dienel)]/AlCl2Et. Journal of Organometallic Chemistry, 371(3), 297-302.