The major product A obtained in the above rea | vedclass

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(A) The reaction of a $1,2$-amino alcohol with $HNO_2$ (Tiffeneau-Demjanov rearrangement or similar pinacol-type rearrangement) involves the formation

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(A) The reaction of a $1,2$-amino alcohol with $HNO_2$ (Tiffeneau-Demjanov rearrangement or similar pinacol-type rearrangement) involves the formation of a diazonium ion followed by the migration of an anti-periplanar group to the carbocation center formed after the loss of $N_2$. In the given Newman projection,the $Ph$ group is anti to the $-N_2^+$ group. Upon loss of $N_2$,the $Ph$ group migrates to the adjacent carbon,resulting in the formation of a ketone. Based on the stereochemistry of the migration,the $Ph$ group migrates to the carbonyl carbon,leading to the product shown in image $355-$a404.

The major product $A$ obtained in the above reaction is:

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