If I have a dithienyl-benzothiadiazole, and I intend to brominate only one out of two thiophene ring of the structure. Did anyone have any idea/pathway how to do it? Can it be done by controlling the ratio of bromine source?
Andrei Gavryushin
Normally you get the statistic mixture, and in this case it seems it will not be easy to separate the products. It is easier to control it on the stage of the synthesis, i. e. the coupling of the dibromobenzothiadiazole, like here, for example
https://www.google.ch/patents/WO2003020790A2?cl=en
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