1, 4-Dinitrocyclohexane (11) has been prepared by peroxytrifluoroacetic acid oxidation of 1, 4cvclohexanedione dioxime (I) and by sodium borohydride reduction of cis-or trans-l, 4- dibromo-l, 4-dinitrocyclohexane (VII). Oxidation of trans-1, 4-dibromo-1, 4- dinitrosocyclohexane (IIIa) by peroxytrifluoroacetic acid affords trans-VII. Incidental to the synthetic work the stereochemistry of the isomers of dibromo compounds IIIa and VI1 and ...