Electrochemical synthesis method for preparing halogenated hydantoin
A technology of dibromohydantoin and hydantoin, which is applied in the field of preparation of various dibromohydantoin and bromochlorohydantoin high-efficiency disinfection, sterilization and algicides, and can solve the problem of difficult production control of liquid bromine or chlorine, hydantoin Problems such as obvious decomposition and high cost of raw materials are achieved to achieve the effect of convenient and simple feeding operation, cheap and easy-to-obtain raw materials, and high product yield
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Embodiment 1
[0025] Add 30mL of water, 1.28g (0.01mol) of dimethylhydantoin and 1.90g (0.02mol) of magnesium chloride into a 100mL flask, insert an electrode with both the anode and cathode of Pt, connect the circuit, energize and electrolyze, and keep the current at 0.05A (using The electrode area is 1cm 2 ), while stirring, dilute hydrochloric acid was added dropwise in the electrolysis process so that the pH was at 2, electrolysis for 21.5 hours (equal to approximately 4 times the theoretical time value), filtered, washed with water, and dried to obtain 0.49g of product dichlorodimethylhydantoin, the yield 25.0%
Embodiment 2
[0027] Add 30mL of sodium chloride solution with a concentration of 0.2g / mL, 1.28g (0.01mol) of dimethylhydantoin in a 100mL flask, insert an electrode with Au as the anode and C as the cathode, connect the circuit, energize and electrolyze, and keep the current at 0.5A (with an electrode area of 1cm 2 ), while stirring, dilute hydrochloric acid was added dropwise in the electrolysis process so that the pH was at 4-5, electrolysis was performed for 10.5 hours (equal to approximately 5 times the theoretical time value), filtered, washed with water, and dried to obtain 1.42 g of product dichlorodimethylhydantoin, Yield 72.3%.
Embodiment 3
[0029] Add 30mL of water, 2.80g (0.01mol) of xylylene hydantoin and 1.90g (0.02mol) of magnesium chloride into a 100mL flask, insert electrodes with both cathode and anode being Pt, connect the circuit, energize and electrolyze, and keep the current at 0.1A ( The electrode area used is 1cm 2 ), while stirring, dilute hydrochloric acid was added dropwise in the electrolysis process so that the pH was at 6-7, and the electrolysis was performed for 10.5 hours (approximately equal to the theoretical time value), filtered, washed with water, and dried to obtain 2.61g of product dichlorodiphenylhydantoin. Rate 75.0%.
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