1,2-Dimethylcyclohexane
The preferred chair has both methyls equatorial, which minimises 1,3-diaxial repulsions. In the 1,2-disubstituted case this is possible only for the trans-isomer, which is 6 kJ/mol more stable than the cis-isomer (in the 1,2-cis isomer one of the methyl groups must be axial).
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