Process for the alkylation of 3,4-dihydroxythiophene-2,5-dicarboxylic esters
The invention relates to a process for the alkylation of 3,4-dihydroxythiophene-2, 5-dicarboxylic esters or their alkali metal or alkaline earth metal salts with alkylating agents in a polar diluent in the presence of quaternary onium salts.
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(2008/06/13)
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