Downstream synthetic route of Phthalazine

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It is a common heterocyclic compound, the phthalazine compound, Phthalazine, cas is 253-52-1 its synthesis route is as follows.

A. A solution of phthalazine (2.5 g, 19.2 mmol) in concentrated sulfuric acid (30 mL) is treated slowly with potassium nitrate (2 g, 19.2 mmol). After 18 h the solution is cooled. Water (30 mL) is added. The solution is basified using 10 M NaOH to pH 13 (litmus). The solution is cooled for 18 h, filtered to give 5-nitro-phthalazine (0.93 g).

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Reference£º
Patent; Calvo, Raul R.; Cheung, Wing S.; Player, Mark R.; US2006/116368; (2006); A1;,
Phthalazine – Wikipedia
Phthalazine | C8H6N2 – PubChem