The total strain energy of conformation D is 7.5 kcal/mole (R denotes an unspeci

Question

The total strain energy of conformation D is 7.5 kcal/mole (R denotes an unspecified alkyl group). What strain energy (in kcal/mole) is associated with a single H:R eclipsed interaction?

http://s9.postimg.org/g49jrepn3/image.png

Assuming that the angle strain of compound F is 21.5 kcal/mole what is the total strain energy
(in kcal/mole) of compound F?

http://s13.postimg.org/djf0ijnrb/image.png

The total strain energy of conformation D is 7.5 kcal/mole (R denotes an unspecified alkyl group). What strain energy (in kcal/mole) is associated with a single H:R eclipsed interaction? Assuming that the angle strain of compound F is 21.5 kcal/mole what is the total strain energy (in kcal/mole) of compound F?

Explanation / Answer

The strain energy for the staggered form (given in the image) is 7.5 kcal/mole. For the eclipsed conformation, the energy would be almost twice that of the staggered form.

Energy of the eclipsed form is 15 kcal/mole.

For compound F, the total strain energy will be 21.5 + 2*21.5 = 64.5 kcal/mole.

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