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Reaction of tetrachlorothiophene with silver difluoride gave 2,2,5,5-tetrafluoro-3,4-dichlorothiolene. Experiments were carried out to exchange halogen atoms of chlorinated and brominated 2,5-dimethylthiophenes with fluorine by means of silver fluoride. Only these halogen atoms were substituted by fluorine which were attached to methyl groups. An attempt to force the replacement of the 0-bonded chlorine atoms of 2,5-bis(trifluoromethyl)-3,4-dichlorothiophene by means of silver difluoride resulted in opening and desulfurization of the thiophene ring, thereby forming l,l,l,2, 5,6,6,6-oetafluoro-3,4dichlorohexadiene-3,4.