申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0160246A1
公开(公告)日:1985-11-06
A method for producing a 2-phenylbenzotriazole useful as an ultraviolet absorber and represented by the general formula (III),
wherein R1 represents a hydrogen or chlorine atom, or a C1-C4 lower alkyl or lower alkoxy, carboxy or sulfonic acid group, R2 represents a hydrogen or chlorine atom, or a C1-C4 lower alkyl or lower alkoxy group, and R3, R4 and R5 each represent a hydrogen or chlorine atom, or a C1-C12 alkyl, phenyl, C1-C8 alkyl group-substituted phenyl, phenyl-C1-C8 alkyl, hydroxy, phenoxy or C1-C4 alkoxy group, which comprises reducing a 2-phenylbenzotriazol-N-oxide represented by the general formula (II),
wherein RI, R2, R3, R4 and R5 represent the same meanings as described above, with one or more members selected from the group consisting of phosphorus, hypophosphorous acid and its salts in the presence of an alkali and a napthoquinone in the absence or presence of a surface active agent, or comprises reducing an o-nitroazobenzene represented by the general formula (I),
wherein R1, R2, R3, R4 and R5 represent the same meanings as described above, with one or more members selected from the group consisting of phosphorus, hypophosphorous acid and its salts in the presence of an alkali and a naphthoquinone in the absence or presence of a surface active agent to obtain a 2-phenylbenzotriazol-N-oxide represented by the general formula (II),
wherein R1, R2, R3, R4 and R5 represent the same meanings as describe above, and reducing the resulting compound (II) with one or more members selected from the group consisting of phosphorus, hypophosphorous add and its salts in the presence of an alkali and a naphthoquinone in the absence or presence of a surface active agent.
一种由通式(III)表示的可用作紫外线吸收剂的2-苯基苯并三唑的生产方法、
其中 R1 代表氢原子或氯原子,或 C1-C4 低级烷基或低级烷氧基、羧基或磺酸基,R2 代表氢原子或氯原子,或 C1-C4 低级烷基或低级烷氧基,R3、R4 和 R5 各代表氢原子或氯原子,或 C1-C12 烷基、苯基、C1-C8 烷基取代的苯基、苯基-C1-C8 烷基、羟基、苯氧基或 C1-C4 烷氧基,该方法包括还原通式(II)代表的 2-苯基苯并三唑-N-氧化物、
其中 RI、R2、R3、R4 和 R5 代表与上述相同的含义,一个或多个成员选自磷、次磷 酸及其盐组成的组,在碱和萘醌存在或不存在表面活性剂的情况下,或包括还原通式 (I)所代表的邻硝基偶氮苯、
其中 R1、R2、R3、R4 和 R5 代表与上述相同的含义,在无表面活性剂或有表面活性剂存在的情况下,用选自磷、次磷酸及其盐组成的组中的一个或多个成员,在碱和萘醌存在的情况下,得到通式 (II) 所代表的 2-苯基苯并三唑-N-氧化物、
其中 R1、R2、R3、R4 和 R5 所代表的含义与上述相同,在没有或有表面活性 剂存在的情况下,在碱和萘醌存在的情况下,用选自磷、次磷加及其盐组成的 组中的一个或多个成员还原所得到的化合物 (II)。