CHAPTER 8: Question 13

3D Explanations

H_a and H_c are both in axial positions, so the torsional angle between them is 180^o. From Figure 8.15, this corresponds to a coupling constant of 12Hz.

The torsional angle between H_a (in an axial position) and H_d (in an equatorial position) is 60^o which according to Figure 8.15 corresponds to a coupling constant of about 3Hz.

The torsional angle between H_c (in an axial position) and H_b (in an equatorial position) is 60^o which according to Figure 8.15 corresponds to a coupling constant of about 3Hz.

The torsional angle between H_b and H_d, (both of which are in equatorial position) is also 60^o which according to Figure 8.15 corresponds to a coupling constant of about 3Hz.

The 3D structure below illustrates the torsional angles between the hydrogen atoms.

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