Fluorinated cyclic ketones photolysis

Irradiation of cyclic ketones having perfluoroalkyl groups causes cleavage of a ring to yield acyclic products [I74 (equation 44) Similarly, perfluonnated ketones undergo decarbonylation when irradiated [775]. Gas-phase photolysis of perfluorodiazoketones, in the presence of a trapping agent, yields fluorinated furan as a major product [176] (equation 45)... 

Gas-phase photolysis of the cyclic ketones CFa-(CFj) CF,-C 0 x = 2—5) at 3130 A does not involve migration of fluorine atoms, and the products can be explained on the basis of the general Scheme 11. Reactions 1 and la are the only ones of importance for perfluorocyclopentanone and perfluorocyclohexanone (c/. photolysis of perfiuorocyclobutanone to per-fluorocyclopropane and carbon monoxide ), and reactions 3a and 3b are important only for perfluorocyclo-octanone. 

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