Thermal decomposition of diazo-2,3,4-triphenylcyclopentadiene in the presence of carbene acceptors was not a satisfactory method for the preparation of triphenylcyclopentadienylides. Pyridinium and phosphonium ylides were made by modified salt methods, and an arsonium ylide by a condensation reaction with triphenylarsine oxide.
D. Lloyd and M. I. C. Singer, J. Chem. Soc. C, 1971, 2941 DOI: 10.1039/J39710002941
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