Thermolysis gave 2-phenylbenzoxazole from 2,3-diphenyl-Δ3-1,2,4-oxadiazolin-5-one and from 2,5-diphenyl-Δ4-1,2,4-oxadiazoline-3-one and also gave benzoxazolinone from the latter by new ring transformations which accompanied the formation of 2-phenylbenzimidazole and 2,4-diphenyl-Δ2-1,3,4-oxadiazolin-5-one as respective major products.
J. H. Boyer and P. S. Ellis, J. Chem. Soc., Chem. Commun., 1977, 489 DOI: 10.1039/C39770000489
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