[CH3:1][O:2][CH:3]([O:14][CH3:15])[C:4]1[CH:5]=[C:6]([CH:11]=[CH:12][CH:13]=1)[C:7]([NH:9][NH2:10])=[O:8].[CH:16]([O-])([O-])OC>>[CH3:15][O:14][CH:3]([O:2][CH3:1])[C:4]1[CH:5]=[C:6]([C:7]2[O:8][CH:16]=[N:10][N:9]=2)[CH:11]=[CH:12][CH:13]=12.1 g of 3-dimethoxymethylbenzhydrazide and 12.7 g of methyl orthoformate were reacted at atmospheric pressure for 24 hours while distilling off the methanol formed. Excessive methyl orthoformate was removed by distillation under reduced pressure. The residue was purified by a column chromatography (eluant: n-hexane/ethyl acetate=3/1) to obtain 1.35 g of colorless oily 2-(3-dimethoxymethylphenyl)-1,3,4-oxadiazole.
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