2,3,5,6-Tetrasubstituted p-benzoquinones of the formula I ##STR1## where R is bromine, C.sub.2 -C.sub.6 -acylthio or benzoylthio, their preparation and their use for the preparation of 4,8-dihydrobenzo[1,2-c:4,5-c']dithiophene-4,8-dione are described.
本发明涉及式I的2,3,5,6-四取代的p-苯醌,其中R为
溴,C.sub.2-C.sub.6-酰
硫基或苯甲酰
硫基,以及它们的制备方法和它们用于制备4,8-二氢苯并[1,2-c:4,5-c']二
硫吩-4,8-二酮的用途。