PROBLEM 12.3 - Organic Chemistry

Question

Question: Draw all alkenes that react with one equivalent of H₂ in the presence of a palladium catalyst to form each alkane. Consider constitutional isomers only

a.

b.

c.

     

Step-by-Step Solution

Answer

Answer

a.

b.

c.

H 2 Palladium catalyst

H₂ Palladium catalyst is a solid catalyst used in the hydrogenation reaction of alkenes.

The reactant and the catalyst are in different phases; therefore, the reaction is termed heterogeneous catalysis. 

Formation of alkanes from alkenes

Alkenes undergo a reduction reaction using a hydrogen palladium catalyst and form alkane.

The unsaturated carbon-carbon double bond is reduced to a saturated carbon-carbon single bond. 

 

Reaction of alkenes in the presence of H 2 palladium catalyst

Constitutional isomers of alkenes can result in the formation of identical alkanes.

a.

Formation of isopentane

from constitution isomer of 3-methyl-butene

b.

Formation of 1,1-dimethylcyclohexane

from constitutional isomers of dimethyl cyclohexene

c.

Formation of 1,1-dimethylcyclohexane

from constitutional isomers of dimethyl cyclohexene