N ‐Heteroaralkyl substituted α‐amidinium thiolsulfates

The syntheses of a number of N ‐substituted α‐amidinium thiolsulfates, CH 2 (S 2 O 3 − )‐C(=NH 2 + )NH(CH 2 )nR are described, where n was varied from 1 to 3 and R represents such heteroaryl groups as 2‐furyl, 2‐thienyl, 3‐indolyl and 2‐, 3‐ and 4‐pyridyl. The preparation of S ‐(2‐imidazolinemethyl)thiolsulfuric acid, as an example of an N, N' ‐disubstituted α‐amidinium thiolsulfate, is also reported.