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The 2-H olefins, R1CH[dbnd]CF2 (1: CF3 2: SF5) react with the silylphosphites (R2O)2POSiMe3 (3a: R2 = Et; 3b: R2 = SiMe3) to yield the (E/Z) phosphonates R1CH[dbnd]CFP(O)(OR2)2, 4a/b and 5a/b and fluorotrimethylsilane. In the case of R2 = SiMe3 hydrolyses furnished the acids R1CH[dbnd]CFP(O)(OH)2, 4c and 5c. The preparation of (E)-SF5CF[dbnd]CFP(O)(OH)2, 7 is reported, too.
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