[CH3:1][O:2][CH:3]([O:13][CH3:14])[C:4]1[CH:5]=[C:6]([CH:10]=[CH:11][CH:12]=1)[C:7](O)=[O:8].C(N(CC)CC)C.C(Cl)(=O)OCC.O.[NH2:29][NH2:30]>C(Cl)Cl>[CH3:1][O:2][CH:3]([O:13][CH3:14])[C:4]1[CH:5]=[C:6]([CH:10]=[CH:11][CH:12]=1)[C:7]([NH:29][NH2:30])=[O:8]3.92 g of 3-dimethoxymethylbenzoic acid and 2.22 g of triethylamine were dissolved in 40 ml of methylene chloride. To the solution was dropwise added 2.28 g of ethyl chlorocarbonate at -30° to -20° C. The mixture was stirred for 30 minutes at the same temperature. The mixture was then cooled to -55° C., and 5.00 g of hydrazine hydrate was added thereto. The temperature of the mixture was elevated to room temperature. The methylene chloride layer was separated, washed with water and a saturated aqueous sodium chloride solution in this order and dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure. The residue was purified by a column chromatography (eluant: chloroform/ethanol=30/1) to obtain 4.13 g of colorless oily 3-dimethoxymethylbenzhydrazide.
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