A re-examination of the oxidation of cyclohexene (1) with hydrogen peroxide-vanadium pentoxide (HP-VP, Eisenbraun, Bader, Polacheck, and Reif Vol. 28 is a major product of the oxidation of cyclohexene with HP-VP, and that it actually exceeds 2-cyclohexen-lone (3) in the product mixture by a ratio of 2.3:1. The oxidation was repreated several times according to the published procedure,2 and each experiment gave essentially the same product boiling at 61-63°( 14 mm.) in reasonable agreement with the reported value.
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