Question

What is Hinsberg reagent?

Answer 1

$\text{Benzenesulphonyl chloride}\left(C_6{H}_{5}S{O}_{2}Cl\right)\text{is also known as Hinsberg's reagent.}$ It reacts with the primary and secondary amine to form sulphonamides. Secondary and tertiary amines can be distinguished by allowing them to react with Hinsberg's reagent ( benzene sulphonyl chloride $C_6{H}_{5}S{O}_{2}Cl$). Secondary amines react with Hinsberg's reagent to form a product that is insoluble in an alkali. For example, $N,N$ - diethylamine reacts with Hinsberg's reagent to form $N,N-$ diethyl benzene sulphonamide, which is insoluble in an alkali. Tertiary amines, however, do not react with Hinsberg's reagent.