The zwitterionic adduct between tri-n-butylphosphine and carbon disulphide reacts under neutral conditions with two equivalents of dimethyl and diethyl acetylenedicarboxylate, dibenzoylacetylene and methyl benzoylpropiolate to give novel crystalline dithiole-containing ylides whose structure is established by X-ray crystallography.
R. A. Aitken, G. Ferguson and S. V. Raut, J. Chem. Soc., Chem. Commun., 1991, 812 DOI: 10.1039/C39910000812
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