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1.
公开(公告)号:US3996291A
公开(公告)日:1976-12-07
申请号:US560831
申请日:1975-03-21
申请人: Henri Dietrich , Jorg Kallen , Gottfried Seifert
发明人: Henri Dietrich , Jorg Kallen , Gottfried Seifert
摘要: Production of 4-hydroxy-3,5-dibromobenzaldehyde reacting p-cresol with bromine, converting the 2,6-dibromo-p-cresol obtained as the first reaction product into 4-hydroxy-3,5-dibromobenzal bromide by further bromination and hydrolysing the latter.
摘要翻译: 生产4-羟基-3,5-二溴苯甲醛使对甲酚与溴反应,将作为第一反应产物获得的2,6-二溴 - 对甲酚进一步溴化转化为4-羟基-3,5-二溴苄溴, 水解后者。
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公开(公告)号:US3935251A
公开(公告)日:1976-01-27
申请号:US449176
申请日:1974-03-07
申请人: Joachim Dazzi , Rudolf Kirchmayr , Henri Dietrich
发明人: Joachim Dazzi , Rudolf Kirchmayr , Henri Dietrich
IPC分类号: C08L67/00 , C07D307/91 , C08G85/00 , C08K5/00 , C08K5/1535 , C08L1/00 , C08L23/00 , C08L27/00 , C08L33/00 , C08L33/02 , C08L77/00 , C08L101/00
CPC分类号: C07D307/91 , C08K5/1535
摘要: Polyhalogenated dibenzofuranes having at least six halogen atoms are prepared by halogenation of 2,4,8-trichlorodibenzofurane or of dibenzofurane. The halogenation may be achieved by Cl.sub.2, Br.sub.2, SO.sub.2 Cl.sub.2, S.sub.2 Cl.sub.2 or similar halogen donors. The products are flameproofing agents for polymers, especially for polyesters and polyolefins. Examples are octachloro-, trichlorotribromo- and trichlorotetrabromo-benzofurane.
摘要翻译: 具有至少六个卤素原子的多卤代二苯并呋喃通过卤化2,4,8-三氯二苯并呋喃或二苯并呋喃来制备。 卤化可以通过Cl 2,Br 2,SO 2 Cl 2,S 2 Cl 2或类似的卤素供体来实现。 该产品是用于聚合物的防火剂,特别是聚酯和聚烯烃。 实例是八氯,三氯三溴和三氯四溴 - 苯并呋喃。
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