Silyl Group Migration in 2-(Trialkylsilyl)thiophenetricarbonylchromium(0) Complexes

Michael S. Loft; David A. Widdowson; Timothy J. Mowlem

doi:10.1055/s-1992-21292

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Synlett 1992; 1992(2): 135-136
DOI: 10.1055/s-1992-21292

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Silyl Group Migration in 2-(Trialkylsilyl)thiophenetricarbonylchromium(0) Complexes

Michael S. Loft^* , David A. Widdowson, Timothy J. Mowlem

^*Department of Chemistry, Imperial College of Science, Technology and Medicine, London, SW7 2AY, England

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Publication Date:
08 March 2002 (online)

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Deprotonation of 5-methyl-2-(trialkylsilyl)thiophenetricarbonylchromium(0) complexes (5, R₃ = Me₃, Et₃, i-PrMe₂) with tert-butyllithium resulted in intermolecular silyl transfer reactions which generated, inter alia, 2-methyl-3-(trialkylsilyl) thiophenetricarbonylchromium(0) (7) and 2-methyl-3,5-bis(trialkylsilyl)thiophenetricarbonylchromium(0) (8). The bulky silanes (5, R₃ = t-BuMe₂, i-Pr₃) were stable to these conditions.

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