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enter image description hereI know the mechanism of this reaction but it is stated that these are stereospecific in nature . why do we call these stereospecific explain with example.

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    $\begingroup$ The hydrogen being abstracted by the base, and the leaving group must be anti-periplanar. This requirement determines the stereochemistry unambiguously , and thus the reaction is stereospecific. $\endgroup$ – getafix Aug 17 '16 at 20:27

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