The acid-catalysed reaction of benzoin with ethyl orthoformate yields 2-ethoxy-4,5-diphenyl-1,3-dioxole which on pyrolysis in the presence of a carboxylic acid forms diphenylethyne: pyrolysis under reduced pressure of the compound alone forms diphenylethyne and diphenylketen.
G. I. Moss, G. Crank and F. W. Eastwood, J. Chem. Soc. D, 1970, 206 DOI: 10.1039/C29700000206
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