To determine the product ‘B’, we need to analyze the given reaction sequence step-by-step:
The first step involves the reduction of the cyano group (−CN) using diisobutylaluminium hydride (DIBAL-H) followed by hydrolysis.
This transforms the −CN group into an aldehyde group.
Thus, compound 'A' is formed by converting the nitrile to an aldehyde.
In the second step, compound ‘A’ reacts with acetaldehyde (CH3CHO) under aldol condensation conditions (presence of dilute NaOH and heat).
Aldol condensation occurs when enolate ions, formed from aldehydes or ketones in basic conditions, react with another aldehyde or ketone. Here, the enolate form of acetaldehyde will add to the aldehyde formed from the initial reduction.
This reaction leads to the formation of a β-hydroxy ketone or aldehyde, which can further undergo dehydration to form an α,β-unsaturated carbonyl compound.
Therefore, the major product ‘B’ is the unsaturated carbonyl compound formed through the aldol condensation reaction.
The correct option representing product ‘B’ is:
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Approach Solution -2
The correct answer is (B) : 2nd reaction is the cross aldol reaction.
The primary and secondary amines, including several amine derivatives, have a direct impact on their properties due to the presence of hydrogen bonding. The compounds containing phosphorus have a lower boiling point and the compounds containing amines and alcohol have a higher boiling point. The structure of alkanols is immensely similar to that of amine except the presence of the hydroxyl group. In such a case, oxygen has a higher electronegativity than that of nitrogen, so alkanol compounds are more acidic in nature in comparison to the amines.
On account of the ability to form hydrogen bonds, the amines have tendencies of high solubility in water. The amine molecules such as Ethyl, diethyl, triethyl, and Methyl are gaseous in nature. Whereas, higher weight amines have a solid structure and alkyl amines have a liquid structure. There is an ammonia smell to gaseous amines and a fishy smell to liquid amines. The solubility of amines entirely depends upon the number of carbon atoms in the molecule.
