Calculate strain energy for the conformer pictured below, using strain energy in

Question

Calculate strain energy for the conformer pictured below, using strain energy increments from the table.

(Calculate your answer to the nearest 0.1 energy unit, and be sure to specify units, kJ/mol or kcal/mol. The answer is case sensitive.)

Strain Energy for Alkanes Interaction / Compound kJ/mol kcal/mol H : H eclipsing 4.0 1.0 H : CH3 eclipsing 5.8 1.4 CH3 : CH3 eclipsing 11.0 2.6 gauche butane 3.8 0.9 cyclopropane 115 27.5 cyclobutane 110 26.3 cyclopentane 26.0 6.2 cycloheptane 26.2 6.3 cyclooctane 40.5 9.7

Explanation / Answer

Answer –

Given the strain energy for alkanes and 2,3-dimethylbutane conformation. When we draw this given Sawhorse projection to Newman projection then we will get the given conformation is gauche conformation and there is 60o angle.

There are two CH3 –CH3 interaction, so the total energy for this one is

= 2*3.8

= 7.6 kJ/mole

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