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Question
What is the major product of the given E2 reaction?
What is the major product of the given E2 reaction?
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Solution
The correct option is B
The transition state of E2 consists of a H atom and a leaving group from the substrate aligned in the plane.
Thus, H and Br from anti positions should be eliminated. Rotating a carbon atom with its substitutes so as to make H and Br in antiposition (180o) and the elimination gives a cis-product where two methyl groups and ethyl groups are on same side.
The transition state of E2 consists of a H atom and a leaving group from the substrate aligned in the plane.
Thus, H and Br from anti positions should be eliminated. Rotating a carbon atom with its substitutes so as to make H and Br in antiposition (180o) and the elimination gives a cis-product where two methyl groups and ethyl groups are on same side.
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