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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Tungsten
Alkynes
Carbon Monoxide
Nuclear magnetic resonance
Nucleophiles
Propellers

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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.",
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Synthesis and nuclear magnetic resonance studies of co-ordinatively unsaturated alkyne complexes of tungsten(II). / Davidson, Jack L.; Vasapollo, Giuseppe.

In: Journal of the Chemical Society, Dalton Transactions, No. 11, 1985, p. 2239-2245.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Synthesis and nuclear magnetic resonance studies of co-ordinatively unsaturated alkyne complexes of tungsten(II)

AU - Davidson, Jack L.

AU - Vasapollo, Giuseppe

PY - 1985

Y1 - 1985

N2 - [{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.

AB - [{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.

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