13C and 1H NMR investigation of the structure of N″-sulphonyl-N-alkylideneformamidrazones

The ¹³C and ¹H NMR spectra of N″-sulphonyl-N-alkylideneformamidrazones have been recorded and the chemical shifts assigned. The tautomeric structure proved to be an N²- alkylidenehydrazide sulphonylimide. The barrier to rotation around the CN¹ bond was estimated from variable from temperature ¹H NMR measurements, and the Z/E ratio and its solvent dependence was investigated.