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1037nal fraction, b.p. 63-65', probably consisted of an azeotrope. The yield of pure ester represents the minimum value for large mechanical losses were sustained in handling the small sample.We are indebted to the Research Corporation for financial aid in the pursuance of this work. Acknowledgment.MORLEY CHEJIICAL LABORATORY WESTERN RESERVE UNIVERSITY CLEVELAND 6, OHIO Triazines. XVI.

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.

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