Question

In the following reaction, ' $A$ ' is
 

• A.
• B.
• C.
• D.

Hint:

Carbamates (R-NH-C(=O)OR’) are commonly formed by the reaction of primary amines with chloroformates (RO-C(=O)-Cl).

Answer 1

The Correct Option is A

Analysis of the Given Reaction:

The given reaction involves a substitution of the hydroxyl group (-OH) with an ethyl carbamate (-COOEt) group to form the major product. The steps are as follows:

1. The compound NH₂−CH₂OH reacts with ethyl chloroformate (EtO-C(=O)-Cl) under basic or catalytic conditions.
2. The primary amine group (−NH₂) undergoes nucleophilic attack on the carbonyl carbon of ethyl chloroformate, resulting in the formation of a carbamate group (NH-C(=O)OEt).

The major product, A, is NH-C(=O)OEt, as shown in option (1).

Answer 2

The correct answer is option (A) : 

Initially lone pair electrons of −NH₂​ attack electrophilic carbon, after then lone pair electrons of oxygen attack leading to the formation of a cyclic compound.