Reactions of tetrafluoroethene oligomers part 11 [1] flash vacuum thermolysis of some products derived from the pentamer and hexamer oligomers.
作者:Paul L. Coe、Michael I. Cook、Ian R. Owen
DOI:10.1016/s0022-1139(00)83931-7
日期:1989.3
Flash vacuum thermolysis of a variety of derivatives of tetrafluoroethene oligomers in the temperature range 450-600° at 20mm - 0.4mm Hg affords a number of unusual products. Thus, the pentamer (1) affords perfluoro 1,2,3- trimethyl cyclobutene (2), and perfluoro-2,3-dimethylpentadiene (3,) (4) as previously reported, but in much different ratios. The diazoalkane (5) affords and -3H-perfluoro-4-methylhex-3-ene
Reactions involving fluoride ion. Part 23. Thermolytic defluorination of perfluoroalkenes in the synthesis of fluorinated dienes and cyclobutenes
作者:Richard D. Chambers、Andrew A. Lindley、Harold C. Fielding、John S. Moilliet、Graham Whittaker
DOI:10.1039/p19810001064
日期:——
3-dimethylbutadiene (over Pt) and perfluoro-3,4-dimethylhexa-2,4-diene (over Fe), together with other products. Similar reactions occur with other fluorinated alkenes and the variation between fragmentation and defluorination is rationalised on the basis of the metal used, etc. The fluoride induced reaction between perfluoropropene and perfluorobut-2-ene gives perfluoro-2,3-dimethylpent-2-ene.
Polyfluoro-1,2-epoxy alkanes and cycloalkanes. Part IV [1]. Thermal reactions of the epoxides of the pentamer and hexamer oligomers of tetrafluoroethene
Co-pyrolysis of (1) with bromine afforded (E) and (Z) 2-bromoperfluoro-3-methylpent-2-ene (6a, 6b), whilst with toluene, (E) and (Z) 2H-perfluoro-3-methylpent-2-ene (7a, 7b) were obtained: (1) with excess cyclohexene also gave (7a, 7b). The oxiran (2), on pyrolysis alone, gave only (3). In the presence of bromine, (2) gave an equimolar mixture of 1-bromoperfluoro-3-methylpentan-2-one (8) and 3-bromoperfluoro-3-methylpentane