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The thionation of bis(acylsilanes) with spacers of variable size with hexamethyldisilathiane under cobalt(II) chloride or trimethylsilyl triflate catalysis affords 2,5-bis(trialkylsilyl)-thiophenes, 2,6-bis(trialkylsilyl)-4H-thiopyrans and 2,7-bis(trialkylsilyl)-4,5-dihydrothiepine generally along with a minor amount of the corresponding oxo analogue. The synthesis of both symmetrical and unsymmetrical bis(trialkylsilyl) derivatives was achieved.
Laboratoire “Réactions Sélectives et Applications”, UMR CNRS 6519, Faculté des Sciences, Université de Reims, B.P. 1039, F-51687 Reims Cedex 2, France
Laboratoire “Réactions Sélectives et Applications”, UMR CNRS 6519, Faculté des Sciences, Université de Reims, B.P. 1039, F-51687 Reims Cedex 2, France