A cn group question 9 options two of these can be reduced to...

A -CN group… Question 9 options: Two of these Can be reduced to an amine Explodes when talked to Can react with Grignard reagents to give ethers after work up Adds an extra carbon atom to a molecule when used in synthesis.

Transcript

00:01 Dear students, cyclic acetyls are used as protecting groups for ketones and aldehydes.

00:09 Cyclic acetyls are used as protecting groups for ketones and aldehydes because they are inert to all of the following reagent except, we know cyclic acetyls are used as protecting groups.

00:23 Let us see how they are used.

00:25 This is a carmyl group, aldehyde or ketone.

00:29 So this, you can use ethylene glycol as a reagent here.

00:42 Then what will happen? it will form a protective group.

00:46 Now this is, this forms a protective group.

00:52 This is called a cyclic acetyl.

00:56 Now this cyclic acetyl can be attacked by only acid.

01:00 This is highly stable, can be attacked by only acids or aqueous acids, only acid or aqueous acid.

01:20 Then, but other reagents like oxidizing agent, reducing agent, aqueous base, they cannot attack because this will open only after the protonation, only after the protonation of the ring from the acid.

01:40 So this protonation will start the opening h plus, then this bond will break.

01:58 So this is the second step.

02:00 So in this way, the opening will take place.

02:03 But base cannot protonate it or oxidizing or reducing agent cannot protonate it.

02:08 Therefore, it is stable in aqueous base or in the presence of oxidizing and reducing agents.

02:15 Therefore, cyclic acetyls are used as protecting groups for ketones or aldehydes because they are inert to all of the following reagents except aqueous acids.

02:29 Now the second question is what is the product of the following sequence of reactions? here we are given benzaldehyde.

02:37 Now benzaldehyde reacts with sodium cyanide and hcl.

02:39 We know when benzaldehyde reacts with or an aldehyde reacts with sodium cyanide with in the presence of hcl it forms cyanohydrin...

Question

A -CN group… Question 9 options: Two of these Can be reduced to an amine Explodes when talked to Can react with Grignard reagents to give ethers after work up Adds an extra carbon atom to a molecule when used in synthesis.

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