| Autor: |
M.S. Toy, Roger S. Stringham |
| Rok vydání: |
1976 |
| Předmět: |
|
| Zdroj: |
Journal of Fluorine Chemistry. 7:375-383 |
| ISSN: |
0022-1139 |
| DOI: |
10.1016/s0022-1139(00)82097-7 |
| Popis: |
Vicinal perfluorodi-t-butoxycycloalkanes and isomers have been prepared in 50 to 70% yields through photochemical reactions of (CF 3 ) 3 COOC(CF 3 ) 3 with perfluorocycloolefins (c-C 5 F 8 and c-C 6 F 10 ) under a 200-watt Hg lamp at −20°C. The two isomers of vic-C 5 F 8 [OC(CF 3 ) 3 ] 2 in 1:4 ratio have been fractionated and identified as cis- and trans-isomers respectively. The three isomers for vic-C 6 F 10 [OC(CF 3 ) 3 ] 2 in 1:4:2 ratio have been fractionated and tentatively identified as equatorial-equatorial, axialequatorial and axial-axial respectively. New 2,2′ -perfluorodimethoxycycloalkyls have been prepared in 60 to 80% yields through photolysis of CF 3 OOCF 3 with perfluorocycloolefins under a 2500-watt Hg-Xe lamp at −20°C. The attempted separations of the rotational isomers have been unsuccessful. The need of a strong ultra-violet source for primary perfluorodialkyl peroxide is discussed and the mechanism and the radical chain sequences are presented. Another new synthesis of bis(perfluoro-t-butyl) peroxide [D (CF 3 ) 3 CO-OC(CF 3 ) 3 ⋍34.5 kcal] from (CF 3 ) 3 COF using difluoroamino radicals as the fluoroxy fluorine atoms acceptor is described. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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