Abstract
Abstract1H, 13C, 14N and 15N NMR methods were applied to the study of some Type A mesoionic 1,3‐diphenyltetrazoles with various exocyclic groups. The ring structures of these tetrazoles are confirmed by the nitrogen NMR data. The shielding of N‐4 increases consecutively by amounts of ca 10 ppm as the bonded exocyclic atom changes from S to C to O.
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