Question

Flagpole hydrogens are known for to cause torsional strain. They are found in which configuration of cyclohexane conformers?

• A. Chair conformation
• B. Half-chair
• C. Boat conformation
• D. Twisted boat conformation.

Answer 1

Answer: (C), (D)

Twisted boat conformation.

Flagpole hydrogens cause a lot of torsional strain which leads to instability.

These are found in both boat and twisted boat conformers of cyclohexane, although the strain is reduced in twisted boat conformation.