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The solution spectra of some sulphonyl-benzamidines and -guanidines, in conjunction with the weakly acidic nature of these compounds, provide evidence for the predominance of the sulphonylimino-over the sulphonylamino-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 carbonnitrogen double bond has been possible.THE detailed structure of sulphonyl-amidines and -guanidines has received little study despite the doubt regarding the position of the equilibrium between the tautomers (I) and (11). The preliminary considerations of Barber and the empirical U.V. studies of Angyal and Warburton favoured the sulphonylimino-form for (I; R1 = 9-AcNH*C,H,, R2 = Ph, R3 = H), but no definitive studies have been made on the ' linear ' sulphonylamidine and sulphonylguanidine systems. Examination of the few

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