prov:value
| - A process for the preparation of a substituted 2,2'-dithiophene, which process comprises the steps a) reaction of a compound of the formula wherein Hal stands for hydrogen or halogen, especially Br, R1 and RV indepently are hydrogen or a substituent, n ranges from 0 to 6, preferably being 0; Y, if present, is substituted or unsubstituted phenylene, thiene, 1 ,2-ethylene, or is 1 ,2- ethinylene; R2
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