Given the following partial structure, add a substituent X to C-1 so that it satisfies the indicated stereochemical requirement. What is the A—C—C—X torsion (dihedral) angle in each?
(a) Anti to A
(b) Gauche to A
(c) Anti to C-3
(d) Gauche to C-3
Sample Solution (a) In order to be anti to A, substituent X must be axial. The blue lines in the drawing show the A—C—C—X torsion angle to be 180°
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