Rhodium(II)-catalysed addition of dimethyl diazomalonate to thiophen: a simple synthesis of thiophenium bismethoxycarbonylmethylides and crystal and molecular structure of the unsubstituted methylide

Abstract

Rhodium(II) acetate-catalysed addition of dimethyl diazomalonate to thiophen and its derivatives results in the formation of stable crystalline thiophenium ylides; the structure of thiophenium bismethoxycarbonyl-methylide has been determined by X-ray analysis.