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Difluoromethanesulfonic acid(1)readily reacts with P_2O_5 at room temperature to givedifluoromethyl difluoromethanesulfonate(2)and SO_2 in stead of the expected acid anhydride.Ifperfluorosulfonic acid(3)perfluorocarboxylic acid(5)or KI was added to this reaction mixture,di-fluoromethyl perfluorosulfonate(4),difluoromethyl perfluorocarboxylate(6)and HCF_2I(7)wasformed respectively in addition to 2.A similar result was obtained using POCl_3 or SOCl_2 insteadof P_2O_5 as dehydrating agent.The mechanisms of the formation of difluorocarbene were discussed.
Difluoromethanesulfonic acid (1) readily reacts with P 2 O 5 at room temperature to give difluoromethyl difluoromethanesulfonate (2) and SO 2 in stead of the expected acid anhydride. Iperfluorosulfonic acid (3) perfluorocarboxylic acid (5) or KI was added to this reaction mixture, di-fluoromethyl perfluorosulfonate (4), difluoromethyl perfluorocarboxylate (6) and HCF_2I (7) were formed respectively in addition to 2.A similar result was obtained using POCl_3 or SOCl_2 instead of P_2O_5 as dehydrating agent. These mechanisms of the formation of difluorocarbene were discussed.