Perkin reaction scope

The condensation product of dithiooxamide with benzaldehyde has been shown to be 2,5-diphenylthiazolo[5,4-d]thiazole (equation 75) (60JA2719). Its formation involves dehydration of the reactants and further dehydrogenation. The reaction is comparable in scope with condensations such as the Perkin reaction, and many 2,5-diarylthiazolo[5,4-c ]thiazoles have been prepared from a variety of aryl aldehydes. Condensation products were not obtained from simple aliphatic aldehydes (71JMC743). 

Boyce, C.B.C., Webb, S.B., and Phillips, L., The phosphorus trichloride-oxygen-olefin reaction. Scope and mechanism, J. Chem. Soc., Perkin Trans. 1, 1650, 1974. 

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