o-Nitrosobenzaldehyde is a reactive intermediate useful in the synthesis of nitrogen heterocycles. Previous strategies for using o-nitrosobenzaldehyde involve its isolation via chromatography and/or formation under harsh conditions. Herein, this intermediate was photochemically generated in situ from o-nitrobenzyl alcohols in a mild, efficient manner for the construction of 1,2-dihydro-3 H-indazol-3-ones using an aqueous solvent at room temperature. This convenient reaction offers several advantages over reported methods. The commercially available photoreactor employed 3 × 18 W bulbs outputting broad emission above 365 nm.

中文翻译：

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室温下在水溶液中光化学制备1,2-二氢-3 H-吲唑-3-酮。

邻硝基苯甲醛是一种反应性中间体，可用于合成氮杂环。以前使用邻亚硝基苯甲醛的策略涉及通过色谱分离和/或在苛刻条件下形成。在此，该中间体以温和，有效的方式从邻硝基苄基醇原位光化学生成，用于在室温下使用水性溶剂构建1,2-二氢-3 H-吲唑-3-酮。与报道的方法相比，这种方便的反应具有多个优点。市售的光反应器使用3×18 W灯泡，可在365 nm以上发出宽广的发射光。