cis- and trans-1,4-Dimethylcyclohexane C8H16

Section 2.14. Identification of cis-trans structures.

Check that you can identify the cis and trans isomers from the models. As with the 1,2-dimethylcyclohexanes, the cis isomer is forced to have one methyl axial, and the trans isomer can have both equatorial. The energy difference for one methyl axial is 7.5 kJ, so for two axial methyl groups, it will be 15 kJ, meaning that virtually all the molecules exist in the diequatorial conformation.


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File created Thu Jan 30 21:53:42 2003