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Method for producing N- halogenated organic compounds. Hassan Ehrner Ghar; Bruce Peters; Edgar Shpilman; Dustin Thomas (USA). Usa 2005049420
Preparation of 2,4-dibromo-5,5-dimethylhydantoin aqueous disinfectant. Zhou, Li Xue; Zhu, Yunqi. Xuzhou Industrial Vocational and Technical College, Xuzhou, a native. China Journal of Nanjing Yegong University, Natural Science Edition (2004), 26 volumes, 6 issues, 36-40 pages.
Preparation method of 1, 3- dibromo-5,5-dimethylhydantoin granules for killing harmful bacteria in aquaculture water source. Yellow. (Wuxi Zhongshun Biotechnology Co., Ltd., Peop. People's Republic of China (PRC)). Ming Shu of Shen Qing Gong Kaishuo (2003), 6 pages, code: CNXXEV CN 14 10363.
Methods of microbial control in water system. Jonathan howarth; Christopher Nalepa; Michael j. Sanders (Albemarle Company, USA). Usa 664 1828
Synthesis and antibacterial activity of n, N- dihalo -5, 5- dimethylhydantoin. Zhang, victory; Xu and Zu Xun; Yellow,; Chen, Zuxing. Sch。 Chemistry. Materials science. Hubei University, Wuhan, Peop. China Xue Bao of Hubei University, Natural Science Class (2002), 24( 1), 63-65.
Method for producing n- halogenated organic compounds. Hassan Ehrner Ghar; Bruce Peters; Edgar E. Spearman, Jr.; Dustin h. Thomas (American Yabao Company). International percentage. (200 1), page 55.
1, 3- dibromo-5,5-dimethylhydantoin with enhanced performance. Hassan Ehrner Ghar; Jonathan howarth; Bruce Peters; Edgar E. Spearman, Jr.; Dustin h. Thomas (American Yabao Company). International percentage. Application number (200 1), 3 1 page WO.
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Composition and method using 1, 3- bromochloro -5- methyl -5- propyl hydantoin. Bhattacharya，Bhabatosh。 Great Lakes Chemical Company, USA. International percentage. Application (1997), page 24, WO 9743264.
New progress in preparation of 1, 3- dibromo-5,5-dimethylhydantoin. Makish, Yitzhak; Allard, Ann. Chemada, dorna Hanegov, Israel. Industry and trade. Engineering Chemistry Research (1995), 34 (6), 2 125-7. (This should be the closest to industrial production and the most accurate. )
Synthesis of 1, 3- dibromo-5,5-dimethylhydantoin. Xu,; Huang and Jin Xia; Li, Yan; Fang,. Leave chemistry. Hubei University, Wuhan, Peop. China Huaxue Century (1994), 16(5), 307-8, 3 1 1.
Organic synthesis using sodium bromate. Two. In the presence of sulfuric acid, N- bromoimide and amide can be easily synthesized from sodium bromate and hydrobromic acid (or sodium bromide E). Fujisaki, Zuo Shi; Hamura, Satoshi Estuary, Jiuxiong; Akiko Nishida. Fac。 English Yamaguchi University, Changpantai, Japan. Bulletin of Japanese Chemical Society (1993), 66(8), 2426-8.
Dense halogenated dimethyl hydantoin. Leon m. cole (Great Lakes Chemical Company, USA). The United States (1985), page 5, page 4532330.
1, 3- dihalo-5,5-dialkyl hydantoin. Burry, Zofija; Daniela Quait; Jia Voska, Romana. (Instytut Farmaceutyczny)。 Pol。 (1966), 2 pages in total, PL 5 1580.
abstract:
Title compds Get ready. It is easy to separate by known methods. From the reaction mixture. In this way, the yield of compounds. Much higher than 5,5-dialkyl hydantoin. The method can avoid acidification of the reaction mixture. And in this way prevent HCN from evolving. Therefore, 120 g. NH4HCO3 is at 50? In 1 18 ml. 25% ammonia, 50 ml. H2O, 35g KCN and 37ml. Add Me2CO, the mixture. Heat for 2.5 hours. Under vigorous stirring at 55-60℃? Three more hours. 90 years old? And cooled to 15? . 1000 ml sodium hydroxide (42g). Add H2O, 57 ml. Br drops within 30 minutes. , and mixt. Stir at 10- 15? 1.5 hours. And kept crystallizing overnight at room temperature. A yellow crystal of100g was obtained. Product m. 196-8? , containing. 99% 1, 3- dibromo-5,5-dimethylhydantoin. 1, 3- dichloro-5,5-dimethylhydantoin, m. 130-2? Similarly obtained.
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