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The atropisomerism about a heptafluoroisopropyl to aryl bond in 5-amino-4-heptafluoroisopropyl indazole is reported. The through-space hydrogen fluorine coupling of the indazole H-3 proton with the tertiary F atom is shown to be useful to distinguish the two rotamers. The same atropisomerism is also observed in the analogous indole, benzofuran, and naphthaline derivatives. 相似文献
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