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The deuterium-induced 13C isotope shifts of 21 nitrogen-containing benzoheterocyclic systems labelled at the NH position were measured in DMSO-d6 . The compounds included bridged diphenylamines, benzolactams, 4-quinolinone, acridinones, carbazoles and indoles. The variations of two-bond isotope effects are discussed as a function of cross-conjugation of the N—H(D) group and acidity of the NH proton.
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Morales‐Ríos et al. (1999) studied this question.
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