Researches on substituted arylamides of dithiocarboxylic acids

The following compounds hitherto undescribed in the literature, are prepared: ethyl esters of arylamides of cyanomonothiomalonic acid, with electronegative substituents in the phenyl groups, aryl amides of cyanoacetic acid, and nitriles of substituted anilides of arylazothiomalonic acid. Heating arylamides of cyanoacetic acid with -bromoacetophenone in absolute alcohol gives quaternary salts of 2-cyanomethyl-3-aryl-4-phenylthiazoles and their methylene bases. Reaction of the quarternary salts of 2-cyanomethyl-3-aryl-4-phenylthiazoles with substituted phenyldiazonium salts gives a number of 2-cyanoarylazomethylene-3-aryl-4-phenylthiazoles.