3-Aryl-5-methyl-1,2,4-oxadiazoles react cleanly with triphenylphosphine at ca. 200 °C in a bimolecular reaction involving nucleophilic attack at C-3 of the heterocycle to give aryl nitrile, acetonitrile, and triphenylphosphine oxide.
J. W. Brown and D. A. Wilson, J. Chem. Soc., Perkin Trans. 2, 1988, 123 DOI: 10.1039/P29880000123
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