Abnormal hydroxylation by permanganate of cyclopentadiene (1a) and 1, 3-cyclohexadiene (1b) has been described previously. This pathway, referred to as the epoxidic pathway, gives (1, 2, 3, 4/0)-1, 2-epoxydiols (3), and (1, 2, 3/4)-and (1, 2, 4/3)-tetrols (5 and 6) in addition to normal products. A second abnormal pathway, described by other authors, converts 1, 5-hexadiene (7) and related dienes (9) into tetrahydrofurandiols (8 and 10). ...
