In the following reactions,the product S is | vedclass

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(A) The reaction sequence is as follows: \ $1$. Ozonolysis of $5$-methylindene followed by reductive workup $(Zn, H_2O)$ yields a dialdehyde intermed

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$6-$methylisoquinoline

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(A) The reaction sequence is as follows: \ $1$. Ozonolysis of $5$-methylindene followed by reductive workup $(Zn, H_2O)$ yields a dialdehyde intermediate $(R)$,which is $2-(2-oxopropyl)benzaldehyde$ derivative. \ $2$. The reaction of this dialdehyde with $NH_3$ involves an intramolecular condensation reaction. \ $3$. The nitrogen atom of ammonia attacks one of the carbonyl groups to form an imine,which then undergoes cyclization with the other carbonyl group. \ $4$. Subsequent dehydration leads to the formation of the aromatic heterocyclic compound $S$,which is $6$-methylisoquinoline.

In the following reactions,the product $S$ is

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