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The synthesis of some novel N‐1 substituted 4‐iodo‐ and 3,4‐diiodopyrazoles starting from the corresponding NH‐pyrazoles is described. On basis of their 13C nmr data and those of already known related congeners the influence of iodo‐ as well as N‐1 substituents on pyrazole 13C chemical shifts and 13C,1H spin coupling constants is investigated.
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Hölzer et al. (1995) studied this question.
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