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Communication | Regular issue | Vol 6, No. 7, 1977, pp.911-927
Published online, 1st January, 1970
DOI: 10.3987/R-1977-07-0911
Dynamic Conformationaland Exchange Processes in 2-(4’-Pyridyl)benzazoles

Claude Marzin,* Michael E. Peek, José Elguero, Hubert P. Figeys, and Nicole Defay

*Université des Sciences et Techinique du Languedoc, Plave E. Bataillon, 34060 Montpellier Cedex, France

Abstract

The barrier to the rotation about the C-C bond linking the two heterocycles of 2-(4’-pyridyl)benzazoles and of their pyridinium salts is too low to be measured by proton nmr spectroscopy at 60 MHz. A slowing down of the proton exchange between the two benzimidazole nitrogen atoms has been shown to occur. The conformation of the different molecules is discussed.