Write the reaction of primary amine with Carbon disulphide (CS₂).

Question 64 of 69

CS_2

Puducherry TnboardTamil Nadu HSC (DGE) Board 2024Subjective· 3mImportance★★★★★

93% · 64/69 Questions

🔒 Locked · start free trial →

You're viewing a preview — the full solution, concept, methods & PYQ mapping are locked.

Start your 14-day free trial to unlock the full solution →

A primary amine adds across carbon disulphide's $C=S$ bond to form an alkyl dithiocarbamic acid, which then loses $H_2S$ (usually promoted by $HgCl_2$ ) to give an alkyl isothiocyanate — the mustard-oil reaction.

Step 1 — Addition: A primary amine ( $R-NH_2$ ), acting as a nucleophile, adds to the electrophilic carbon of carbon disulphide ( $CS_2$ ): $R-NH_2 + CS_2 \rightarrow R-NH-C(=S)-SH$ giving an N-alkyl dithiocarbamic acid.

Step 2 — Desulphurisation to isothiocyanate: This dithiocarbamic acid is unstable and, especially in the presence of a desulphurising/dehydrosulphurising agent such as mercury(II) chloride ( $HgCl_2$ ), loses hydrogen sulphide to form the alkyl isothiocyanate: $R-NH-C(=S)-SH \xrightarrow{HgCl_2} R-N=C=S + H_2S$

…

Start your 14-day free trial to unlock the full solution →

←Previous questionQ20 — When aniline reacts with acetic anhydride, the product formed is : (a)…→Next questionQ22 — (a) (i) How acetic acid is prepared from Grignard reagent ? (ii) What …

Q.Write the reaction of primary amine with Carbon disulphide ( $CS_2$ ).

Concept understanding — Chemical Reactions of Amines

Q.Write the reaction of primary amine with Carbon disulphide (CS2CS_2CS2​).

🎓Unlock everything free for 14 days

Q.Write the reaction of primary amine with Carbon disulphide ( $CS_2$ ).

Unlock everything free for 14 days