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Unformatted text preview: Catalytic hydrogenation of aldehydes and ketones occurs, but is usually a second choice after metal hydride reduction. Alkenes and alkynes typically hydrogenate faster, while esters (RCO 2 R') and carboxylic acids (RCO 2 H) hydrogenate much slower, than aldehydes and ketones. general reactivity order in catalytic hydrogenation A AH 2 Pt/H 2 RC CR' > RR'C=CR''R''' > RCCl O = > RCH (R') O > RCOR' O > RCOH O very fast very slow Sometimes catalytic hydrogenation is a useful procedure because it reduces more than one functional group in a compound. 2 CH 3 CH O aldol condensation CH 3 CH=CHCH O 2-butenal H 2 Ni CH 3 CH 2 CH 2 CH 2 OH 1-butanol...
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- Organic chemistry, Lithium aluminium hydride, Aldehyde, catalytic hydrogenation, Hydride Transfer Agents