Characteristic coupling constants ¹J_(13C-13C) of some mesoionic methylides contaIning a diphenyltetrazolium ring

Abstract

¹J_(13C-13C) data are presented for some Types A and B tetrazoliwn methylides. The results show a large amoWlt of double bond character for the C₅-C₆ bond which is significantly reduced upon protonation. A similar decrease in bond order is noted for the C₆-C₈ bond following protonation.