Synthesis and nuclear magnetic resonance studies of co-ordinatively unsaturated alkyne complexes of tungsten(II)

Jack L. Davidson, Giuseppe Vasapollo

Research output: Contribution to journalArticle

Abstract

[{WBr2(CO)4}2] reacts with alkynes RC=CR' (R = R' = Me, Et, or Ph) and PhC=CMe to give dimeric complexes [{WBr2(CO)(RC=CR')2}2]. These react with nucleophiles (L) to give monoalkyne complexes [WBr2(CO)L2(RC=CR')] [L = CNBut, P(OMe)3, or PPh3; R = R' = Me or Ph; R = Me, R' = Ph) which exist in cis and/or trans isomeric forms and which exhibit alkyne 'propeller rotation' according to 1H and 31P n.m.r. studies. The isolation of [WBr2(CO)(CNBut)(MeC=CMe)2] indicates that the reactions proceed via monomeric bis-alkyne intermediates.

Original languageEnglish
Pages (from-to)2239-2245
Number of pages7
JournalJournal of the Chemical Society, Dalton Transactions
Issue number11
DOIs
Publication statusPublished - 1985

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