A NEW TELOGEN FOR TELECHELIC OLIGOMERS OF CHLOROTRIFLUOROTHYLENE

Elemental iodine is slightly soluble in liquid chlorotrifluoroethylene (CTFE) under autogenous pressure at room temperature. Exposure of a mixture of no more than 0.22 mol of iodine with 1 mol of CTFE in a borosilicate glass Carius tube to sunlight, an artificial UV source or to gamma-radiation resu...

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Bibliographic Details
Published inJournal of fluorine chemistry Vol. 73; no. 1; pp. 87 - 94
Main Authors CHAMBERS, RD, GREENHALL, MP, WRIGHT, AP, CAPORICCIO, G
Format Journal Article
LanguageEnglish
Published LAUSANNE Elsevier 01.07.1995
Subjects
Chemistry
Chemistry, Inorganic & Nuclear
Chemistry, Organic
Physical Sciences
Science & Technology
CHLOROTRIFLUOROETHYLENE
MASS SPECTROMETRY
IR SPECTROSCOPY
TELOGENS
NMR SPECTROSCOPY
TELECHELIC OLIGOMERS
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Summary:Elemental iodine is slightly soluble in liquid chlorotrifluoroethylene (CTFE) under autogenous pressure at room temperature. Exposure of a mixture of no more than 0.22 mol of iodine with 1 mol of CTFE in a borosilicate glass Carius tube to sunlight, an artificial UV source or to gamma-radiation resulted in complete conversion of all the solid iodine initially to ICF2CFCII (1), which was isolated and characterised. The reaction is reversible, the equilibrium constant for I-2+ CTFE(liq). reversible arrow 1 being ca. 0.22. Thus with light or heat, isolated unconfined 1 reverted to iodine and CTFE. Additional irradiation of 1 confined with excess liquid CTFE led to the irreversible formation of telomers I(CF2CFCl)(n)I (2). The average value of n in the distribution of telomers increased with dose giving liquids (n = 2-4) or greases (n = 2-10) which were much more stable than 1. Upon bromination, individual telomers in the series Br(CF2CFCl)(n)Br were isolated and characterised.
ISSN:0022-1139
1873-3328
DOI:10.1016/0022-1139(94)03206-F