Proton magnetic resonance studies of products formed by cyanobenzenes and nitrocyanobenzenes when dissolved in liquid ammonia
Abstract
Meisenheimer-like anionic σ-complexes have been identified by 1H n.m.r. spectroscopy in liquid ammonia solutions of 1,3,5-tricyanobenzene, of 1,2,4,5-tetracyanobenzene (pyromellitonitrile), and of 3,5-dinitrobenzonitrile.