The 15N chemical shifts and 1H15N and 13C15N coupling constants of nine monolabelled indazoles were measured and assigned. The experimental values are discussed in terms of the indazolic and iso‐indazolic structures, and compared with literature data for other related heterocycles. All the results are consistent with an N‐1(H) tautomeric structure for indazole in DMSO‐d6.
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Fruchier et al. (1982) studied this question.
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