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3-phenylcyclopentene
It is based on E2 Mechanism
The general form of the E2 mechanism is as follows:
B: = base
X = leaving group (usually halide or tosylate)
In the E2 mechanism, a base abstracts a proton neighboring the leaving group, forcing the electrons down to make a double bond, and, in so doing, forcing off the leaving group. When numerous things happen simultaneously in a mechanism, such as the E2 reaction, it is called a concerted step.
if u can understand ok otherwise i will write the reaction
The given compound we may regard as a secondary halide, and many sec and tert halides undergo elimination by E1 mechanism. Formation of carbocation is the r.d.s.Thus in this case the proton attached to carbon having phenyl goup is likely to be eliminated, forming a tertiary carbocation, more stable than the other possibility a secondary.This would then eliminate the bromide ion to form 1-Phenylcyclopentene.
It has been observed that the dehydrohalogenation of substituted cycloalkyl halides follows the Saytzeff's rule; thus supporting formation of 1-phenylcyclopentene.
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