Indole derivatives.

The nature of the products of reduction of nitro compounds of the indole series containing a polysulfide chain depends on the length of the latter. In mono- and disulfides only the nitro groups are reduced, and diamino monosulfides and diamino disulfides are formed. In the reduction of the dinitro trisulfide the chain is cleaved and an amino thiol is formed. The reduction of acetylthionitro compounds is accompanied by migration of the S-N bond, as a result of which an acetamido thiol is formed.