D. Boulahia et al., Synthesis of fluorinated telomers. Part 6. Telomerization of hexafluoropropene with alpha,omega-diiodoperfluoroalkanes, J FLUORINE, 94(2), 1999, pp. 175-182
The synthesis of highly fluorinated telomers produced from the thermal bulk
telomerization of hexafluoropropene (HFP) with alpha,omega-diiodoperfluoro
alkanes is described. That involving 1,2-diiodotetrafluoroethane was unsucc
essful because of the thermal decomposition of this diiodide from 190 degre
es C. An optimization of the telomerization reaction involving 1,4-diiodope
rfluorobutane taking into account key parameters such as the initial [IC4F8
I](0)/[HFP](0) molar ratio, the temperature and the time of the reaction is
attempted. The conditions for the highest conversion of IC4F8I and also fo
r directing the reaction toward the monoadduct or the diadduct are discusse
d. Both these telomers were reduced with tributylstannane into HC4F8(C3F6)(
x)H (with x=1 or 2) and H-C3F6-C4F8-C3F6-H, the H-1 and F-19-NMR spectra of
which confirmed the structure of each derivative. (C) 1999 Elsevier Scienc
e S.A. All rights reserved.