1. Cyclohexane Chair Conformations “Ring-Flip” Conformers
CH 4-6: Cycloalkane Conformations II
Cyclohexane Chair Conformations “Ring-Flip” Conformers
In a conformational “ring – flip” all axial and equatorial groups “switch positions” due to C – C bond rotations.
Are these isomers?
NO!!! They are conformers.

2. Example:
1) Name the compound drawn to the right. Ignore cis-trans designations.
2-fluoro-4-isopropyl-1-methyl cyclohexane
2) Draw the most stable chair conformer.
Remember: Most stable conformer is with the largest substituent in the equatorial position!

3. NO! They are stereoisomers!
3) Draw the “ring-flip” conformer.
…is this a reasonable conformer….
Steric Hindrance: electron pair repulsion causes ring strain!
NO! They are stereoisomers!