Cleavage of Co-C Bond in a Cobaltathiirane by Hydrogen Chloride and Reformation of Co-C Bond by Tetrabutylammonium Fluoride

Abstract

Abstract The cobaltadithiolene complex, (η5-cyclopentadienyl)(1-methoxycarbonyl-1,2-ethenedithiolato)cobalt(III) (1a) reacts with trimethylsilyldiazomethane by formal addition of Me3SiCH to the Co-S bond to afford a cobaltathiirane (2a). Addition of hydrogen chloride to 2a causes the cleavage of the Co-C bond to give chloro(η5-cyclopentadienyl)[[1-(trimethylsilyl)methylthio-κS]-1-methoxycarbonylethene-2-thiolato-κS]cobalt(III)(4a). By the reaction with tetrabutylammonium fluoride in THF, 4a undergoes loss of Cl and Me3Si to afford (η5-cyclopentadienyl)[(methylene-κC-thio-κS)-1-methoxycarbonylethene-2-thiolato-κS]cobalt(III)(2c).