Contributions to the structure of some sulphonyl-benzamidines and -guanidines

Abstract

The solution spectra of some sulphonyl-benzamidines and -guanidines, in conjuction with the weakly acidic nature of these compounds, provide evidence for the predominance of the sulphonylimino- over the sulphonyl-amino-tautomers. As the iodomethylsulphonyl derivatives show the same structures in chloroform solution as those indicated by their capacity to ring-close in aqueous alkali, assignment of the configuration about the carbon–nitrogen double bond has been possible.