Abstract
In a previous work [1], a gaussian distribution of perfluorinated oligomers CF3 (CF2)nCU with n = 1–13 has been obtained, starting from CF2Br2 and an excess of copper powder in DMF, at a temperature above 65° C.By using zinc activation upon CF2Br2 in DMF, in the presence of a pre-formed C6F13CU, chain-extension reactions occur via insertions of :CF2 into the carbon-copper bond, but we also obtain shorter chains than the starting copper reagent.On the other hand, with lead activation upon CF2Br2 in CH2Cl2, in the presence of N(C4H9)4Br, these chain-extension reactions occur, but in this case, we do not observe the formation of shorter chain than the starting substrate.
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