METHOD FOR PREPARING DITHIOCARBAMATES IN PARTICULAR FROM POLYOLS OF THE GLYCEROL TYPE

摘要

The present invention relates to a method for the synthesis of glyceryl dithiocarbamates or bisdithiocarbamates (GDTCs) in which a primary or secondary amine is added, in the presence of carbon sulphide, to a reaction medium comprising (1) a carbonate selected from diethyl carbonate, dimethyl carbonate, or ethylene carbonate or propylene carbonate combined with a polyol of the glycerol type in the presence of a basic catalyst, or (2) a cyclic carbonate comprising five ring members, in a solvent medium, and the GDTC formed is recovered. In particular, a polyol of the glycerol type is brought into contact with diethyl carbonate, in the presence of a catalyst, and then a primary or secondary amine is added, in the presence of carbon sulphide, to the reaction medium, and the GDTC formed is recovered. The invention makes it possible to synthesize glyceryl dithiocarbamates directly from glycerol as starting material and solvent, in a single step. This method involves glycerol, diethyl carbonate, carbon disulphide (CS2) and a primary or secondary amine so as to give the glyceryl dithiocarbamates, it having been possible to recycle the glycerol/NaOH phase 6 times without notable loss of yield, the ethyl acetate also being recycled after each extraction.