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(A) $DiBAL-H$ (Diisobutylaluminium hydride) is a selective reducing agent that reduces esters $(-COOEt)$ and nitriles $(-CN)$ to aldehydes $(-CHO)$ at

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(A) $DiBAL-H$ (Diisobutylaluminium hydride) is a selective reducing agent that reduces esters $(-COOEt)$ and nitriles $(-CN)$ to aldehydes $(-CHO)$ at low temperatures (typically $-78 \ ^{\circ}C$).In the given reaction,the starting material contains both an ester group $(-COOEt)$ and an aldehyde group $(-CHO)$.$DiBAL-H$ will selectively reduce the ester group to an aldehyde group while leaving the existing aldehyde group unaffected.Therefore,the ester group $EtO-CO-CH_2-$ is converted to $OHC-CH_2-$.The final product is $OHC-CH_2-cyclopent-3-ene-CH_2CH_2CHO$.

Consider the above reaction and predict the major product.

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