The preparation of 1-aryl- and 1-heteroaryl-alkene-1,2-dithiolates
Abstract
It is shown that alkaline hydrolysis of 2-(NN-dialkylamino)-1,3-dithiolium salts produces solutions of ene-1,2-dithiolate salts which are trapped by reaction with iodomethane. The dithiolium salts were prepared by reaction of α-bromoketones with sodium NN-dialkyldithiocarbamates, followed by sulphuric acid-catalysed dehydrative ring-closure of the resulting β-oxoalkyl NN-dialkyldithiocarbamates.