What is the major product of the following reaction?

Question

Quizplus · Accepted Answer

In a cyclic structure the anti coplanar structure needed for elimination occurs when both the leaving group and the b hydrogen are axial. In this structure there are multiple hydrogens that can eliminate in the anti coplanar model. The major product arises from the elimination of the only b hydrogen that is trans to the leaving group and gives the Zaitsev product. As a quick shortcut, if your leaving group is wedged it will need a dashed hydrogen for the anti coplanar elimination. Likewise, if your leaving group is dashed it will need a wedged hydrogen for anti coplanar elimination.

What Is the Major Product of the Following Reaction