METHOD FOR PREPARING DITHIOCARBAMATES IN PARTICULAR FROM POLYOLS OF THE GLYCEROL TYPE
申请人:Jerome Francois
公开号:US20120264941A1
公开(公告)日:2012-10-18
The present invention concerns a method for the synthesis of glycerol dithiocarbamates or bis-dithiocarbamates (GDTCs) in which a reaction medium comprising (1) a carbonate selected from diethyl carbonate, dimethyl carbonate and ethylene or propylene carbonate associated with a glycerol type polyol in the presence of a basic catalyst or (2) a cyclic carbonate comprising five ring members, in a solvent medium, is supplemented with a primary or secondary amine in the presence of carbon disulphide, and the GDTC formed is recovered. In particular, a glycerol type polyol is brought into the presence of diethyl carbonate in the presence of a catalyst, then a primary or secondary amine is added to the reaction medium in the presence of carbon disulphide, and the GDTC formed is recovered. The invention can be used for one-step synthesis of glycerol dithiocarbamates directly from glycerol as the starting material and solvent. This method involves glycerol, diethyl carbonate, carbon disulphide (CS
2
) and a primary or secondary amine to produce glycerol dithiocarbamates; the glycerol/NaOH phase can be recycled 6 times without a noticeable drop in yield; the ethyl acetate is also recycled after each extraction.
本发明涉及一种合成甘油二硫代氨基甲酸酯或双硫代氨基甲酸酯(GDTCs)的方法,其中在反应介质中加入(1)选择自乙酸二乙酯、甲酸二甲酯和乙二醇或丙二醇碳酸酯的碳酸盐与一种甘油型多元醇,在碱性催化剂的存在下,或者(2)包含五个环成员的环状碳酸盐,在溶剂介质中,加入一种一次或二次胺和碳二硫化物,然后回收形成的GDTC。特别地,将一种甘油型多元醇与乙酸二乙酯在催化剂的存在下混合,然后在碳二硫化物的存在下向反应介质中加入一种一次或二次胺,最后回收形成的GDTC。该发明可用于直接从甘油作为起始物和溶剂一步合成甘油二硫代氨基甲酸酯。该方法涉及甘油、乙酸二乙酯、碳二硫化物(CS2)和一种一次或二次胺来产生甘油二硫代氨基甲酸酯;甘油/氢氧化钠相可循环使用6次而不会明显降低产率;每次萃取后乙酸乙酯也可回收利用。