Abstract N-(3, 4-Dialkoxyphenylthiomethyl) aroylamides (la, b) reacted with phosphoryl chloride to give not only the expected 4H-and 2H-1, 3-benzothiazine derivatives (4a, b and 5a, b), but also dibenzodithiocins of new (dibenzo [d, g][1, 3] dithiocins 2a, b) and known (dibenzo [b, f][1, 5] dithiocins 3a, b) types. The analogous reaction of the 4-methylaroylamide 8a furnished the 4H-1, 3-benzothiazine 9a, the dibenzo [b, f][1, 5] dithiocin derivative 10a ...