Process for the preparation of 3, 4-alkylenedioxythiophene-2,5-dicarboxylic acid derivatives
申请人:——
公开号:US20020002287A1
公开(公告)日:2002-01-03
A process for the preparation of 3,4-alkylenedioxythiophene-2,5-dicarboxylic acid derivatives of the general formulae IV and V
1
characterized in that at least 2 steps in accordance with formula scheme 1, in which R
1
, R
2
, R
3
and R
4
are identical or different and are a linear or branched, optionally substituted alkyl radical having 1 to 20 carbon atoms, A is lithium, sodium or potassium, and Hal is fluorine, chlorine, bromine or iodine, are carried out without isolation of the intermediates, gives the target products in high purity and yield.
2
Anti-microbial compositions comprising certain imidazolium ionic liquids and non-ionic or anionic surfactants and methods of using said compositions in the preservation of personal care and cosmetic applications are provided.