Why erythro isomer gives trans product after E2 elimination
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Answer:
Stereospecificity of E2 reactions
In this case, there's only one β hydrogen and therefore only one confirmation that allows to put it at 180o with the Br. It is not the most stable conformation, but the molecule has no choice as that is a requirement. Therefore, this is a stereospecific reaction.
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Explanation:
an erythro isomer is a compound in which two hydrogens of two SP3 adjacent carbons are in opposite directions (literally trans) .
Hence when E2 elimination occur the eliminating group and a hydrogen eliminates. Hence trans compound formed.
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