Structure of Products of Reaction between Benzoylacetylene and 1,5-Diphenyldithiobiuret.

Reaction of benzoylacetylene with 1,5-diphenyldithiobiuret in glacial AcOH in the presence of equimolar amounts of HClO₄ leads exclusively to 2-benzoylmethyl-4,6-di(phenylimino)-1,3,5-dithiazinium perchlorate. In MeOH, benzene, and MeCN medium, the reaction proceeds nonselectively and a mixture is formed that includes 2-benzoylmethyl-4,6-di(phenylimino)-1,3,5-dithiazine, 2-benzoylmethyl-4-benzoylvinylthio-3-phenyl-6-phenylimino-1,3,5-thiadiazine, 2-benzoylmethyl-4,6-di-(thiocarbonyl)-1,3-diphenyl-1,3,5-triazine, and N-benzoylvinyl-N'-phenylthiourea. [ABSTRACT FROM AUTHOR]