1,3-Dimethylcyclohexane
The preferred chair has both methyl groups equatorial, which minimises 1,3-diaxial repulsions. In the 1,3-disubstituted case this is possible only for the cis-isomer, which is 7 kJ/mol more stable than the trans-isomer (in the 1,3-trans isomer one of the methyl groups must be axial).
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