Synthesis and reactions of the carbene complexes [M(SnPh3)(CO)2{C(OEt)Ph}L](M = Mo or W; L =η-C5H5,η-C5Me5 or indenyl), [M(SnPh3)(CO)2{C(OEt)Me}(η-C5H5)](M = Mo or W) and [MI(CO)2{C(OEt)R}(η-C5H5)](M = Mo or W, R = Me or Ph). X-Ray crystal structures of [Mo(SnPh3)(CO)2{C(OEt)Ph}(η-C5Me5)] and [WI(CO)2{C(OEt)Ph}(η-C5H5)]
- 1 January 1991
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. S,p. 749-758
- https://doi.org/10.1039/dt9910000749
Abstract
Treatment of the tricarbonyls [M(SnPh3)(CO)3L][M = Mo or W; L =η-C5H5, η-C5Me5 or η5-C9H7-(indenyl)] with LiPh followed by [OEt3][BF4] results in the formation of the carbenes [M(SnPh3)(CO)2{C(OEt)Ph}L] in good to high yields. Related reactions of [M(SnPh3)(CO)3(η-C5H5)] but using LiMe afford [M(SnPh3)(CO)2{C(OEt)Me}(η-C5H5)]. The complex trans-[M(SnPh3)(CO)2{C(OEt)Ph}(η-C5Me5)] is monoclinic, a, = 14.611(36), b= 16.788(20), c= 16.183(30)Å, β= 96.08(18)°, and R= 0.0888 for 2117 independent reflections. While the η-C5H5 and indenyl complexes exist as pairs of isomers in solution generated by rotation about the MCcarbene bond, the η-C5Me5 complexes exist as single isomers in solution. Treatment of [M(SnPh3)(CO)2{C(OEt)Ph}(η-C5H5)](M = Mo or W) with I2 results in formation of the iodometal species [MI(CO)2{C(OEt)Ph}(η-C5H5)]. The complex [WI(CO)2{C(OEt)Ph}(η-C5H5)] is monoclinic, a= 9.34(3), b= 13.00(2), c= 13.53(3)Å, β= 97.8(2)°, and R= 0.0812 for 2091 independent reflections. In solution this compound exists as the three trans isomers and one cis. Treatment of [M(SnPh3)(CO)2{C(OEt)Ph}(η-C5Me5)] with I2 results in the eventual formation of [MoPh(CO)3(η-C5Me5)] in the molybdenum case and [MI3(CO)2(η-C5Me5)] in both cases.Keywords
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