The cis and trans isomers of 1-(carbo-t-butylperoxy)-1, 4-dimethylcyclohexane undergo thermal decomposition at 60" in cumene at essentially the same rates (cis isomer, AH*= 27.5 kcal/mol, AS*= 5.1 eu; trans isomer, AH*= 27.8 kcal/mol, AS*= 5.8 eu). The products, cis-and trans-1, 4-dimethylcyclohexane, l,. l-dimethylcyclohexene, and 4- methylmethylenecyclohexane, formed from the 1, 4-dimethylcyclohexyl radical are the ...