An unexpected migration of a ninhydrin carbon bearing a phenolic subunit has been observed when phenolic adducts of ninhydrin reacted with 2-aminophenol in butan-1-ol at the reflux temperature. The products were unambiguously assigned as 2-(1,3-dioxoisoindolin-2-yl)phenyl benzoates on the basis of NMR spectroscopy and X-ray crystallographic analysis.

中文翻译：

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将邻氨基苯酚核插入茚三酮-苯酚加合物：茚三酮碳的迁移导致 N-苯甲酸取代的邻苯二甲酰亚胺

当茚三酮的酚类加合物在回流温度下与 1-丁醇中的 2-氨基苯酚反应时，已经观察到带有酚亚单元的茚三酮碳的意外迁移。根据 NMR 光谱和 X 射线晶体学分析，产物明确指定为 2-(1,3-二氧异吲哚啉-2-基)苯基苯甲酸酯。