N-Heteroaralkyl substituted α-amidinium thiolsulfates

The syntheses of a number of N-substituted α-amidinium thiolsulfates, CH₂(S₂O₃^?)-C(=NH₂⁺)NH(CH₂)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.