Trans-l,2-dimethylcyclohexane

One after the other, step through (or animate) the sequence of structures depicting ring inversion in cyclohexane, methylcyclohexane and trans-l,2-dimethylcyclohexane. Is the overall motion involved in the ring inversion similar in all three Describe any differences. 

Fe(opba)]20 catalyzes the oxidation of cyclohexane and adamantane with total yields up to 5 % based on the oxidant after 24 h with a ratio A/K of 0.9 and a ratio 3°/2° of 3 (84). These results are in line with a mechanism involving hydroxyl radicals as transient intermediates. In the oxidation of cyclohexane catalyzed by [Fe(tpca)(H20]20 (C104)2, the average alcohol-to-ketone ratio is equal to 7, which is much higher than the value characteristic of radical chain oxidation (54). Also, the stereospecificity observed in the oxidation of cis- and trans-l,2-dimethylcyclohexane (up to 97% retention of configuration) points toward the involvement of a metal-based oxidant (83). A few other complexes showing low to moderate catalytic activity in the oxidation of cyclohexane and/or adamantane are listed in Table IV. 

The exchanges accompanying the pinacol rearrangement in the oyclohexane-l,2-diol and cyclopentane-1,2-diol systems have also been investigated. The pinacolic rearrangement of both cis- (17) and trans-l,2-dimethylcyclohexane-l,2-diol (18) in aqueous acid gives 1-acetyl-methylcyclopentane and a small amount of 2,2-dimethylcyclohexanone... 

Like the 1,4-dimethyl derivatives, trans-l, 2-dimethylcyclohexane has a lower heat of combustion (see Table 3.2) and is more stable than cf.y-l,2-dimethylcyclohexane. The cis stereoisomer has two chair conformations of equal energy, each containing one axial and one equatorial methyl group. 

Dimethyl trans-l,2-dimethylcyclohexane-l,2-dicarboxylate reacts with sodium and trimethylsilyl chloride to give a very high yield of the ring-expanded product (65). ... 

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