Stable crystalline phosphorus ylides are obtained in excellent yields from the 1:1:1 addition reaction between triphenylphosphine, dialkyl acetylenedicarboxylate and strong NH-acids, such as imidazole, benzimidazole, benzotriazole or carbazole.
I. Yavari, M. Taher Maghsoodlou, H. Djahaniani and N. Hazeri, J. Chem. Res. (S), 1999, 216 DOI: 10.1039/A807638C
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