Cyclohexane
= Cyclohexane
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<Cyclohexane> is the cyclic <alkane> $\mathrm{C_6H_{12}}$. Its preferred <chair conformation> allows near-tetrahedral bond angles and largely staggered neighboring bonds.
Ring flips exchange axial and equatorial positions. Consequently a substituent can retain its up/down orientation while changing the steric interactions that determine conformational preference and reaction accessibility.