explain why t butyl group in t butyl cyclohexane is locked at equatorial position
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tert-Butyl groups "lock" cyclohexanes into a conformation where the tert-butyl group occupies an equatorial position and the ring-flip equilibrium is essentially stopped. To verify this fact, write the ring-flip equilibrium of cis-1-tert-butyl-4-methylcyclohexane such that the least stable chair conformation is the product (this will cause the ΔE to be greater than (or equal to) zero.
T = 298 K
R = 8.315 J/mole-K
H - Substituent Interaction 1,3-Diaxial Strain (kJ/mole)
H ←→ CH3 = 3.8
H ←→ C(CH3)3 = 11.4
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