An unusually stable thionitrite from N-acetyl-D,L-penicillamine; X-ray crystal and molecular structure of 2-(acetylamino)-2-carboxy-1,1-dimethylethyl thionitrite

N-Acetyl-D,L-penicillamine (1) was converted by HNO2 into a thionitrite (3) which was stable as a solid and atypically so even in solution; X-ray structural parameters are given for (3), and both homolytic and heterolytic reactions are described.