Cycloalkenes into carbonyl compounds

In certain polyfluorinated cyclic compounds difiuoromethylene groups are hydrolyzed to carbonyl groups relatively easily.141 This is usually associated with the formation of cycloalkene intermediates, since the proximity of a C = C bond notably increases the reactivity of a difluoro-methylene group towards hydrolytic reactions. Thus, easy conversion of such groups to oxo groups has been observed in many cyclobutene derivatives. 2-Chloro-l,l,2-trifluoro-3-phenyl-cyclobutane is converted by potassium hydroxide into cyclobutene 1 and cyclobut-2-enone 2.141... 

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