Can aldehydes undergo condensation reactions?

Can aldehydes undergo condensation reactions?

Aldol condensation occurs in aldehydes having α-hydrogen with a dilute base to give β-hydroxy aldehydes called aldols. This reaction is most commonly known as aldol condensation. If the condensation reaction occurs between two different carbonyl compounds it is called crossed aldol condensation.

Can aldehydes form enamines?

Most aldehydes and ketones react with 2º-amines to give products known as enamines (alkene + amine). It should be noted that, like acetal formation, these are acid-catalyzed reversible reactions in which water is lost.

What is the product of the reaction between a secondary amine and an aldehyde?

Secondary amines, R2NH, react with aldehydes or ketones to give carbinolamines which then dehydrate to give enamines. The carbinolamine in these reactions can only eliminate to give a C=C since there is no N-H in the carbinolamine. The products are called enamines because they are “alkene amines”.

What is carbonyl condensation reaction?

Carbonyl condensation reactions take place between two carbonyl‑containing reactants, one of which must possess an alpha‑hydrogen atom. The first step of the reaction involves the removal of an alpha‑hydrogen atom by a base.

Does amine react with aldehyde?

Aldehydes and ketones react with primary amines, in mildly acidic conditions, forming an imine (a Schiff base).

Which functional group is formed by the reaction of primary amine with aldehyde?

The reaction of aldehydes and ketones with ammonia or 1º-amines forms imine derivatives, also known as Schiff bases (compounds having a C=N function).

When secondary amine reacts with aldehyde and ketone yields?

Formation of an enamine occurs when a secondary amine reacts with an aldehyde or ketone, provided that the carbonyl compound has an a-hydrogen. As Eq. 19.60 illustrates, the two alkyl groups of a secondary amine may be part of a ring.

Can an amine react with aldehyde?

To summarize: Aldehydes and ketones react with primary amines (RNH2) to give imines, and with secondary amines (R2NH) to give enamines. In a third type of amine, a tertiary amine (R3N), all hydrogens of ammonia are replaced by alkyl or aryl groups.

Which compound is obtained by the reaction between aldehyde and ketone with hydroxyl amine?

Oxime Oximes
Oximes are organic compounds derived from condensation of aldehydes or ketones with hydroxylamine (NH2OH).

Do aldehydes and ketones undergo condensation reactions?

Aromatic aldehydes form a condensation product when heated with a cyanide ion dissolved in an alcohol‐water solution. This condensation leads to the formation of α hydroxy ketones. The cyanide ion is the only known catalyst for this condensation, because the cyanide ion has unique properties.