Which of the following pairs of reactants is | vedclass

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(B) Enamines are formed by the reaction of a carbonyl compound (aldehyde or ketone) having at least one $\alpha$-hydrogen with a secondary $(2^o)$ ami

Vedclass · Accepted Answer

Cyclohexanone + $(CH_3)_2NH$

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(B) Enamines are formed by the reaction of a carbonyl compound (aldehyde or ketone) having at least one $\alpha$-hydrogen with a secondary $(2^o)$ amine.Option $A$ involves a bulky secondary amine (diisopropylamine),which is sterically hindered and less effective.Option $B$ involves cyclohexanone (a ketone with $\alpha$-hydrogens) and dimethylamine (a simple,unhindered secondary amine). This pair is highly effective for enamine formation.Option $C$ involves a sterically hindered aldehyde (pivalaldehyde),which lacks $\alpha$-hydrogens,making it unable to form an enamine.Therefore,the pair in option $B$ is the most effective.

Which of the following pairs of reactants is most effective in forming an enamine?

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