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
该方法是用于制备一般式IV和V的3,4-烷基二氧
硫杂苯-2,5-二
羧酸衍
生物的过程,其特征在于至少按照公式方案1进行2步反应,其中R1、R2、R3和R4相同或不同,是线性或支链的,可以是有1到20个碳原子的取代烷基基团,A是
锂、
钠或
钾,Hal是
氟、
氯、
溴或
碘,在不分离中间体的情况下,以高纯度和收率得到目标产物。