A partir d'acides cinnamiques substitués on a préparé les styrylisocyanates correspondants qui, par cyclisation thermique, ont fourni des isocarbostyriles que l'action de l'oxychlorure de phosphore transforme en chloro‐1‐isoquinoléines. Ce procédé de synthèse s'est montré supérieur aux méthodes connues.
1,2,4‐Oxadiazole (V) has been prepared by formylation of formamidoxime with acetico‐formic anhydride and cyclization of the O‐formyl derivative VI. Some N‐formyl‐formamidoxime (VII) is formed during this reaction. Isolated by the salting out of its aqueous solution the crude oxadiazole is purified by means of its addition product with CdCl2, which yields pure oxadiazole by steam distillation and subsequent salting out.
Des thiknopyridones isombres ont ktb obtenues par cyclisation d'isocyanates de (jT-thiCnyl)vinyle, puis transformdes en thiknopyridines correspondantes.
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