Telomerisation du fluorure de vinylidene avec CCl 4 et CCl 3-R

Abstract

We have studied the telomerization of vinylidene fluoride with carbon tetrachloride, trichloroethanol and methyl trichloroacetate by redox catalysis as well as radical initiation. In all cases, we obtained telomers having the structure : R-CCl 2-(CH 2-CF 2) n-Cl where R=Cl, CH 2OH and CO 2CH3. The first adducts n=1 to 3 have been isolated in each case and analysed by 1H, 13C and 19F NMR spectroscopy. We did not observe any reverse addition of the monomer on itself. We have also compared the two types of initiation for the selectivity of structures and the chain lengths. It should be noted that with CCl 4 in the presence of deficiency of telogen, (often done to increase the DP n) we obtain adducts having the structure : Cl-(CF 2-CH 2) x-CCl 2-(CH 2-CF 2) y-Cl.