Proton and carbon-13 nuclear magnetic resonance studies of conformations of 1,3-dipyridylthioureas

Abstract
Studies of 1H and 13C chemical shifts and of 1H–1H, 13C–1H coupling constants of 1,3-di-(2-pyridyl)thiourea and its substituted derivatives indicate the occurrence of topomerisation between two internally hydrogen-bonded conformers, with a Z,EE,Z interconversion barrier of ca. 55.0 kJ mol–1.

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