The amounts of stereoisomeric 1,2-dimethylcyclohexanes formed on catalytic hydrogenation of 2-methyl(methylene)-cyclohexene reflect their relative stabilities or not is to be stated. Concept Introduction: > During catalytic hydrogenation, one hydrogen atom gets attached to each of the double bonded carbon atoms.It is a stereospecific syn addition;both hydrogensadd to the same face of the double bond. > In catalytic hydrogenation, the stereo selectivity depends on the direction from which hydrogen atoms are transferred from the catalyst to the double bond. > In the stereochemical reactions of cycloalkenes, the product of syn addition is formed exclusively even though it is less stable stereoisomer. > The stereoisomer in which the bulky substituents occupy maximum equatorial sites is less stable.

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Chapter 8.2, Problem 2P

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Interpretation:

The amounts of stereoisomeric 1,2-dimethylcyclohexanes formed on catalytic hydrogenation of 2-methyl(methylene)-cyclohexene reflect their relative stabilities or not is to be stated.

Concept Introduction:
>
During catalytic hydrogenation, one hydrogen atom gets attached to each of the double bonded carbon atoms.It is a stereospecific syn addition;both hydrogensadd to the same face of the double bond.
>
In catalytic hydrogenation, the stereo selectivity depends on the direction from which hydrogen atoms are transferred from the catalyst to the double bond.
>
In the stereochemical reactions of cycloalkenes, the product of syn addition is formed exclusively even though it is less stable stereoisomer.
>
The stereoisomer in which the bulky substituents occupy maximum equatorial sites is less stable.

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