Abstract: The photolysis of 2-methylcyclohexanone at 3130 A in both the gas and liquid phase has been critically reexamined. Contrary to an earlier report, both trans-and cis-5- heptenal are obtained as major products. Separate photolysis of various mixtures of the product aldehydes established that these geometric isomers are not readily interconverted under the reaction conditions. It can therefore be concluded that the unsaturated ...
