Vn. Elokhina et al., REACTIONS OF 1-ACYL-2-BROMOACETYLENES WITH DITHIOCARBAMIC ACIDS, Bulletin of the Russian Academy of Sciences, Division of Chemical Sciences, 41(8), 1992, pp. 1441-1446
2-Acyl-2-bromoacetylenes react with dithiocarbamic acids in aprotic so
lvents (acetonitrile, chloroform, or ether) to give 5-acyl-2-diethylam
ino(heteryl)-1,3-dithiolium bromides, which on reaction with secondary
amines (diethylamine or morpholine) undergo cleavage of the 1,3-dithi
ole ring to give ithiocarbamoyl-2-diethylamino(morpholyl)ethylenes. X-
ray crystallographic studies on the product from one of these reaction
s has shown it to be 5-thenoyl-2-diethylamino-1,3-dithiolium bromide.