In order to prepare a 1° amine from an alkyl halide with simultaneous addition of one CH₂ group in the carbon chain, the reagent used as source of nitrogen is ___________.

Question

In order to prepare a 1° amine from an alkyl halide with simultaneous addition of one CH 2 group in the carbon chain, the reagent used as source of nitrogen is ___________.

Philoid · Accepted Answer

• When alkyl halide is heated under reflux with a solution of potassium cyanide in ethanolic medium, the halogen is replaced by a -CN group and a nitrile is produced.; here the N required comes from KCN.

• This is a very important reaction for obtaining some compounds like amine. The nitrile formed can be converted to a primary amine by treating it with LiAlH₄ or Na/C₂H₅OH reagents.

CH₃CH₂CH₂Br + CN^-→ CH₃CH₂CH₂CN + Br^-

CH₃CH₂CH₂Br + KCN → CH₃CH₂CH₂CN + KBr

Hence the source of N is KCN and other 3 options (i) Sodium amide, NaNH₂

(ii) Sodium azide, NaN₃ (iv) Potassium phthalimide, C₆H₄(CO)₂N^- K⁺ are entirely wrong

In order to prepare a 1° amine from an alkyl halide with simultaneous addition of one CH2 group in the carbon chain, the reagent used as source of nitrogen is ___________.

In order to prepare a 1° amine from an alkyl halide with simultaneous addition of one CH₂ group in the carbon chain, the reagent used as source of nitrogen is ___________.