Water → 6-Chloro-3-hydrazinyl-4-methylpyridazine

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3,6-Dichloro-4-methylpyridazine (Combi-Blocks) (60 g, 361 mmol) was dissolved in hydrazine monohydrate (Aldrich) (335 mL, 5411 mmol) and the solution was stirred at 80° C. for 1 h, forming a white precipitate. The reaction mixture is dilutes with water and the precipitated products isolated by filtration. The solid crude product is suspended in EtOH and left in an ultra sound bath for 1 h. The desired product (22.4 g) was obtained after filtration and drying under vacuum as a beige solid. tR: 0.31 min (LC-MS 2); ESI-MS: 160.0 [M+H]+ (LC-MS 2). 1H NMR (400 MHz; DMSO-d6) δ ppm 7.83 (br.s, 1H) 7.32 (s, 1H) 4.49 (br.s, 2H) 2.05 (s, 3H).

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