¹H‐NMR‐Spektroskopische Isomerenzuordnung bei Cyclisierungs‐Reaktionen an Benzo‐kondensierten N‐Heterocyclen

Abstract

1 H‐NMR Spectroscopic Assignments of Isomeres to Cyclization Reactions of Benzo‐condensed N‐Heterocycles Cyclic N‐acyl benzazoles show downfield shifts of the aromatic H a proton at the 1 H‐n.m.r. spectrum from 0.5 to 1.95 ppm which allows an assignment of possible isomeres and in some cases statements about the tautomerism. The ΔδH a values of 40 different azolo‐, azino‐, and azepino condensed benzimidazoles are given.