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13C and 15N NMR study of mesoionic type A and type B tetrazoles with four nitrogen atoms in the exocyclic group

13C and 15N NMR measurements are reported from a study of five mesoionic compounds containing either the 2,3‐diphenyl‐ or 1,3‐diphenyltetrazolium ring, and either the 2,3‐diphenyltetrazolium ring or its linear analogue as an exocyclic group. Three 15N‐labelled compounds were synthesized for signal assignment purposes. Some 15N13C and 15N15N coupling constants were determined. A proton was found to be located on the exocyclic groups of two of the compounds.