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(A) The reaction of a vicinal dihalide with $Zn$ dust in the presence of heat $(\Delta)$ is a dehalogenation reaction that leads to the formation of a

Vedclass · Accepted Answer

The product is $Ph-C(Me)=C(Ph)-Me$ (trans-isomer).

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(A) The reaction of a vicinal dihalide with $Zn$ dust in the presence of heat $(\Delta)$ is a dehalogenation reaction that leads to the formation of an alkene.In the given reactant,the two $Cl$ atoms are on adjacent carbons. The stereochemistry of the starting material is such that the two $Ph$ groups are on the same side (cis-like) and the two $Me$ groups are on the same side (cis-like) relative to the $C-C$ bond.When $Zn$ removes the two $Cl$ atoms,the $C-C$ bond rotates to form the most stable alkene product.The product formed is $1,2-diphenyl-1,2-dimethylethene$. Given the steric hindrance between the two bulky $Ph$ groups,the trans-isomer ($Ph$ groups on opposite sides) is more stable than the cis-isomer.Therefore,the major product is the trans-isomer: $Ph-C(Me)=C(Ph)-Me$.

Identify the major product of the following reaction:

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