The reactivity of the radical cations of methyl 2, 2-diphenylcyclohexyl ether (7), 6, 6-diphenyl- 1, 4-dioxaspiro [4.5] decane (8), methyl cis-and trans-2-phenylcyclohexyl ether (9 cis and trans), and 6-phenyl-1, 4-dioxaspiro [4.5] decane (10), generated by photosensitized (electron transfer) irradiation, has been studied. Solutions of the ethers and acetals in acetonitrile-methanol (3: 1), with 1, 4-dicyanobenzene (2) serving as the electron acceptor ...