The propagation and termination rate constants have been determined for the autoxidation of 1,4-dioxan, tetrahydropyran, tetrahydrofuran, 2,s-dimethyltetrahydrofuran, and phthalan. The rate constants for a-hydrogen atom abstraction from sonle of the ethers by the tetralylperoxy radical and from tetralin by some ether peroxy radicals have been measured and compared. The chain transfer rate constants have been estimated for the reaction of the c~~mylperoxy radical with a-hydroperoxytetrahydrofuran, a-hydroperoxytetrahydropyran, and a-ethoxyethyl hydroperoxide.