| 摘要 |
PURPOSE:To prevent the discoloration of dibromodicyanobutane, emission of stimulant odor, corrosion of the apparatus, and the agglomeration of the product, by washing dibromodicyanobutane with water and then with a specific aqueous solution of an inorganic salt. CONSTITUTION:A dibromodicyanobutane (e.g. 1,2-dibromo-2,4-dicyanobutane) can be purified by washing with an aqueous solution of a compound containing alkali metal, alkaline earth metal or ammonium ion as the cationic component and an oxygen-containing anion (e.g. nitrate radical, sulfate radical, etc.) as the anionic component at 0-70 deg.C, preferably 10-40 deg.C. The concentration of the solution is 0.01-50wt%, preferably 0.1-5wt%. USE:Useful as a synthetic intermediate of agricultural chemicals and pharmaceuticals. Especially, 1,2-dibromo-2,4-dicyanobutane is useful as an antiseptic and a mildewproofing agent.
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