Question

Hydrogenation is one of the simplest of the addition reactions to an alkene. Yet understanding the stereochemical outcome can be challenging. Hydrogenation is considered a syn - addition reaction (both atoms are added to the cartoons on one side of the pi - bond). As H_2 or D_2 we symmetric, no regioselectivity (/.e which cartoon of the alkene to add to) is in play. The stereochemical patterns developed below for both symmetric and non - symmetric alkenes are applicable to any syn - addition reactions. For the following deuteration reactions, provide the information requested in the boxes. The first two examples are completed with Et representing CH_2 CH_3.

Answer 1