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The gas-phase photolysis of 2-fluorocyclohexanone at 313 nm and 120°C is reported. The primary dissociative step appears to be The 1-fluoropentanediyl species can disproportionate to form the 1-and 5-fluoro-l-pentenes, or cyclize to form vibrationally excited fluorocyclopentane. The latter molecule either undergoes collisional stabilization or decomposes unimolecularly to give cyclopentene and HF. The half-quenching pressure for the latter reaction was 2 torr. The disproportionation-to-combination ratio for the diradical was found to be 1.2. Some brief preliminary experiments on the liquid-phase photolysis of 2-chlorocyclohexanone and 8-fluorocyclohexanone are also described.

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