申请人:The United States of America as represented by the Secretary of
公开号:US04477389A1
公开(公告)日:1984-10-16
Two procedures are described that can be used to prepare polyhalogenated phenyl isocyanates (2,4,6-trichloro,2,3,5,6-tetrachloro, pentachloro, 2,4,6-tribromo and 2,4,6-trifluoro derivatives) from the corresponding anilines in good yields (95-99%) with small amounts of urea byproducts (1-5%) within reasonable reaction times (3-6 hours). These are: 1. Liquid phase phosgenation of polyhalogenated anilines with tertiary amines as a hydrogen chloride acceptor. 2. Liquid phase phosgenation of polyhalogenated anilines in excess phosgene at the beginning and throughout the reaction.
本文描述了两种方法,可以用于制备多卤代苯基异氰酸酯(2,4,6-三氯、2,3,5,6-四氯、五氯、2,4,6-三溴和2,4,6-三氟衍生物),从相应的苯胺中获得良好的收率(95-99%),并在合理的反应时间(3-6小时)内产生少量的尿素副产物(1-5%)。这两种方法分别是:1. 液相光气化合成多卤代苯胺,使用三级胺作为氢氯酸受体。2. 液相光气化合成多卤代苯胺,在反应开始时和整个反应过程中使用过量的光气。