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Benzoic acid to benzaldehyde...

Benzoic acid to benzaldehyde

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`C_(6)H_(5)COOH underset("Pyridine")overset(SOCl_(2))rarr C_(6)H_(5)COCl underset("Quinoline")overset(H_(2)//Pd-BaSO_(4))rarr C_(6)H_(5)CHO` (Rosenmund.s reaction)
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