Question

Semi-empirical calculations indicate that for cis-1,4-di-tert-butylcyclohexane, a twist boat conformation is approximately 1 kcal/mol (4.2 kJ/mol) more stable than the chair conformation. Propose an explanation.

Answer 1

Soluton cilmich chinen axial Twist Boat HCC (more stable) t-butyl group tries to move our b q1k 9 чң е9 44 ovql of the axiar position. Position Cless stable). In cis 1,4-di-t-butyl cyclohexane, In chair conformation the bulky test.butyl group is in axial position hence it is not stable and try to occupy stable equatorian position in twish Boat. hence Twist Boat conformation is Ikall mol (4.2kJ/mol is more stable than chair conformation.