[WBr2(CO)4]2 reacts with RC≡CR1 (R = R1 = Me, Et, Ph; R = Me, R1 = Ph) to give [WBr2(CO)(RC≡CR1)2]2. These react with nucleophiles (L) to give WBr2(CO)L2(RC≡CR1) [L = CNCMe3, P(OMe)3, PPh3; R = R1 = Me, Ph; R = Me, R1 = Ph], which exist as cis and/or trans isomers and which exhibit alkyne propeller rotation, according to 1H and 31P NMR studies. The isolation of WBr2(CO)(CNCMe3)(MeC≡CMe)2 indicates that the reactions proceed via monomeric bis(alkyne) intermediates.
Synthesis and nuclear magnetic resonance studies of coordinatively unsaturated alkyne complexes of tungsten(II)
VASAPOLLO, Giuseppe
1985-01-01
Abstract
[WBr2(CO)4]2 reacts with RC≡CR1 (R = R1 = Me, Et, Ph; R = Me, R1 = Ph) to give [WBr2(CO)(RC≡CR1)2]2. These react with nucleophiles (L) to give WBr2(CO)L2(RC≡CR1) [L = CNCMe3, P(OMe)3, PPh3; R = R1 = Me, Ph; R = Me, R1 = Ph], which exist as cis and/or trans isomers and which exhibit alkyne propeller rotation, according to 1H and 31P NMR studies. The isolation of WBr2(CO)(CNCMe3)(MeC≡CMe)2 indicates that the reactions proceed via monomeric bis(alkyne) intermediates.File in questo prodotto:
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