Question

How many Aldol Products are possible with addition between Acetaldehyde and propanal?

Answer 1

In order to this question, we will discuss the types of Aldol Products are possible with addition between Acetaldehyde and propanal. And then we will also discuss how alcohol is eliminated in aldol condensation of propanal.

Complete answer:
There are four possible products of aldol condensation between acetaldehyde and propanal. The aldol of acetaldehyde with itself will be one of the products. Similarly, one will be propanal with propanal. The final two aldols will be cross aldols.
$C{H_3} - CO - C{H_3}\xrightarrow{{dilute\,NaOH}}C{H_3} - {C_2}{H_3} - C{H_2} - CO - C{H_3}$
The above reaction is Propane Aldol condensation.
The Claisen-Schmidt condensation is the reaction between an aldehyde/ketone and an aromatic carbonyl molecule lacking an alpha-hydrogen (cross aldol condensation). Rainer Ludwig Claisen and J. G. Schmidt, two of the reaction's pioneering pioneers, independently published on the subject in 1880 and 1881.
If we mix acetaldehyde with propanal in the presence of sodium hydroxide, a crossover aldol reaction with four distinct products is expected. Because each aldehyde contains a hydrogen, it can be transformed into an enolate and react with the carbonyl form of itself or another molecule.
Only carbonyl compounds with alpha hydrogen and alpha carbon atoms experience aldol condensation. Carbonyl compounds include both aldehyde and ketone molecules. Condensation of aldol can be utilised to expand the carbon chain. Carbonyl compounds' alpha hydrogen possess acidic properties. As a result, they are easily eliminated with bases (alkalis) and result in carbanion.

Note:
By establishing a double bond, the alcohol group in the aldol product is removed (dehydration). Propanal aldol condensation also produces an aldol product. Now we'll look at some aldol condensation examples involving aldehydes and ketones. When two or more aldehydes or ketones are present, a mixture of compounds is produced.