6-Heptenal is an aldehyde that also contains a C=C double bond between carbons 6 and 7. If this substrate is treated with excess (or a LOT of) H2 in the presence of Pt, Pd, or Ni metal, the major substrate product would be 1-heptanol 6-hepten-1-ol 5-hepten-1-ol O heptanal 3 of these 4 responses are major substrate products for this reaction

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Reactions at the Alpha Carbon Atom

The position next to the ketone or aldehyde functional group is termed as alpha position and the reaction which occurs at alpha position is called alpha substitution reaction. In an alpha substitution reaction, the alpha proton atom is substituted by an electrophile by the formation of an enol intermediate or enolate ion intermediate. Most of the carbonyl compounds go through an alpha substitution reaction.