IS T S 5. The following incomplete reaction sequences give a starting material and a product that can be prepared from it. Show the reagents that would be necessary to carry out each transformation and any major products that would be formed in the intermediate stages. There may be more than one correct way to complete a sequence. CH3CHCH3 SCH2CH3 CH3CH CH2 991 II НС ОCH-CH2CH3 ОН НС- ОСHЗ ОСHЗ

Q: OH

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Q: H3C a. H3C .CH3 CH3 b. H3C° H3C *OH с. HO HOʻ

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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.