Question

write preparation of ethanol from rosenmund reduction​

Answer 1

The preparation of ethanol from Rosemund reduction is:

The reaction for the formation of acetaldehyde from acetyl chloride(Rosemund Reduction):

$CH_3COCl$ ↔ $CH_3CHO$

• The catalyst used here is Lindlar catalyst which is $H_2/Pd-BaSO_4$ and Boiling Xylene which converts the acetyl chloride to acetaldehyde.
• Rosemund reduction is the preparation of aldehydes from acetyl chlorides with the help of some specific catalyst, namely the "Lindlar catalyst". The aldehyde can be further reacted with Nicotinamide adenine dinucleotide to make alcohol.

The reaction for the preparation of ethanol from acetaldehyde:

$CH_3CHO$ ↔ $CH_3CH_2OH$

• The catalyst used here $NADH + H^+$ is Nicotinamide Adenine Dinucleotide and hydrogen to make ethanol.

Answer 2

Explanation

ROSENMUND REACTION -

• The reaction was first reported in 1918 by Wilhelm Rosenmund.
• The chemical reaction is the hydrogenation process in which acid chlorides are converted to aldehydes.
• The reaction is catalyzed and accelerated by the palladium or barium sulfate.
• The hydrogen gas accelerates the substitution reaction by replacing chloride with hydroxide.
• The reaction is given as -

                             $ROCl + H_2$ → $ROH +HCl$

• The aldehyde undergoes a reaction to form alcohol by the palladium over barium sulfate.

                             $ROH + H_2 + HCl$ → $ROH$

• Further, alcohol is converted to alkane by the activation of hydrogen.

                            $ROH + H_2$ → $RCH_3$