A convenient method for the synthesis of 2-arylazocarboxylates from 2-arylhydrazinecarboxylates by aerobicoxidation with ironphthalocyanine is described. The reaction is applicable to oxidative activation of 1-acyl-2-phenylhydrazines. Some preliminary experiments suggest Michaelis–Menten kinetics and participation of radical species in the reaction mechanism.
Aerobic recycling: A catalytic amount of a hydrazine reagent is sufficient to promote Mitsunobureactions in the presence of triphenylphosphine, an iron catalyst, and air. The active form of the catalyst, an azo species, can be readily generated by iron‐catalyzed aerobic oxidation. MS=molecular sieves, Pc=phthalocyanine.
Oxadiazolinone derivatives of the formula: ##STR1## wherein R represents alkyl of 1 through 4 carbon atoms, R.sub.1 represents halogen, alkyl of 1 through 4 carbon atoms, alkoxy of 1 through 4 carbon atoms or alkylthio of 1 through 4 carbon atoms, and R.sub.2 represents hydrogen, halogen, alkyl of 1 through 4 carbon atoms, alkoxy of 1 through 4 carbon atoms or alkylthio of 1 through 4 carbon atoms, are useful as anthelmintics.