Conversion of I to II: | vedclass

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(D) In $1-$bromotriptycene,the bromine atom is found to be virtually inert to nucleophiles.This is because the rigid structure of the triptycene molec

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does not take place

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(D) In $1-$bromotriptycene,the bromine atom is found to be virtually inert to nucleophiles.This is because the rigid structure of the triptycene molecule prevents the formation of a planar carbocation intermediate required for an $S_N1$ reaction.Furthermore,the backside attack by a nucleophile,which is necessary for an $S_N2$ reaction,is sterically hindered by the three benzene rings,making it impossible for the nucleophile to approach the carbon atom bonded to the bromine.Therefore,the conversion does not take place under standard conditions.

Conversion of $I$ to $II$:

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