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.
R. J. Gillespie, J. Murray-Rust, P. Murray-Rust and A. E. A. Porter, J. Chem. Soc., Chem. Commun., 1978, 83 DOI: 10.1039/C39780000083
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