Predict the product of the following reaction: CH 3 - CH 2 - COOCH 3 → ii . H 3 O ⊕ i . AlH i - Bu 2 ?

Esters can be converted to aldehydes using diisobutylaluminum hydride (DIBAH). The reaction is usually carried out at - 78 ° C to prevent a reaction with the aldehyde product. The chemical reaction is as follows: CH 3 - CH 2 - COOCH 3 → ii . H 3 O ⊕ i . AlH i - Bu 2 CH 3 - CH 2 - CHO ⏟ Propanal .

Write short notes on the stephen reaction.

Alkyl nitriles undergo reduction with the help of tin (II) chloride and hydrochloric acid and form an intermediate imine salt which undergoes hydrolysis with water, giving the final result as aldehydes. R − CN + 2 [ H ] → SnCl 2 / dil . HCl R − CH = NHHCl → H 2 O R − CHO + NH 4 Cl

Explain the following reaction: Cannizzaro reaction

Cannizzaro's reaction: The self oxidation-reduction (disproportionation) reaction of aldehydes which do not have α -hydrogen atom, on treatment with concentrated alkali is known as the Cannizzaro's reaction. In this reaction, two molecules of aldehydes participate where one is reduced to alcohol and the other is oxidised to carboxylic acid. For example, when methanal is treated with concentrated potassium hydroxide, methanol and potassium methanoate are produced. 2 HCHO → Con . KOH CH 3 OH + HCOOK