You can't have both in a chair conformation!
![enter image description here][1]
- If the methyl groups in 1,4-dimethylcyclohexane adopt a bis-axial orientation, they are trans and they stay trans after ring flip.
If the methyl groups in 1,4-dimethylcyclohexane adopt a bis-axial orientation, they are trans and they stay trans after ring flip:
If your 1,4-dimethylcyclohexane is cis-substituted the orientation of the methyl groups is axial and equatorial, respectively:
![enter image description here][2]
- If your 1,4-dimethylcyclohexane is cis-substituted the orientation of the methyl groups is axial and equatorial, resp. [1]: https://i.sstatic.net/5hosP.png [2]: https://i.sstatic.net/levxN.png
