In the following reaction sequence,the major | vedclass

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(A) The reaction of $o$-xylene with succinic anhydride in the presence of anhydrous $AlCl_3$ is a Friedel-Crafts acylation reaction. The electrophile

Vedclass · Accepted Answer

$A$ = $4-$($3$,$4$-dimethylphenyl)$-4-$oxobutanoic acid; $B$ = $6,7-$dimethyl$-3,4-$dihydronaphthalen-$1$(2H)-one

Vedclass · Answer

(A) The reaction of $o$-xylene with succinic anhydride in the presence of anhydrous $AlCl_3$ is a Friedel-Crafts acylation reaction. The electrophile attacks the more electron-rich position of the benzene ring. For $o$-xylene,the para position relative to one methyl group is the most reactive,leading to the formation of $4-(3,4-	ext{dimethylphenyl})-4-	ext{oxobutanoic acid}$ as product $A$.Next,the Clemmensen reduction $(Zn-Hg/HCl)$ reduces the ketone group to a methylene group,forming $4-(3,4-	ext{dimethylphenyl})butanoic acid$.Finally,treatment with $H_3PO_4$ causes intramolecular cyclization (Friedel-Crafts acylation) to form the cyclic ketone,$6,7-	ext{dimethyl}-3,4-	ext{dihydronaphthalen}-1(2H)-	ext{one}$ as product $B$.

In the following reaction sequence,the major products $A$ and $B$ are:

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