1968 年 88 巻 5 号 p. 491-498
When the oxidation of thiocarbanilide (Ia) with sodium peroxide was carried out in aqueous ethanol under refluxing for the purpose of preparing carbanilide (IIa), unexpected 1-phenyl-2-benzimidazolinone (IIIa) was obtained besides IIa, the former being identified with the authentic sample by mixed mp and infrared spectra. Similar cyclization was confirmed with several other symmetric and asymmetric thiocarbanilides.