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.
Regioselective functionalization of glycerol with a dithiocarbamate moiety: an environmentally friendly route to safer fungicides
作者:Rodolphe De Sousa、Cyril Thurier、Christophe Len、Yannick Pouilloux、Joël Barrault、François Jérôme
DOI:10.1039/c1gc15053g
日期:——
report here a convenient pathway for the direct functionalization of glycerol with a dithiocarbamate moiety. This work opens up a cost-efficient and environmentally friendly route to safer fungicides. It should be noted that whereas functionalization of glycerol usually suffers from a lack of selectivity, we show here that our process is fully regioselective.