申请人:MITSUI TOATSU CHEMICALS, Inc.
公开号:EP0219553A1
公开(公告)日:1987-04-29
A process for preparing 3-phenoxybenzyl 2-(4-alkoxyphenyl)-2-methylpropyl ethers represented by formula (I).
(wherein R represents a lower alkyl group, and X, and X2 each represents a hydrogen atom or a fluorine atom) by hydrogenating 3-phenoxybenzyl 2-(4-alkoxy-3- halogenophenyl)-2-methylpropyl ethers or 3-phenoxybenzyl 2-(4-alkoxy-3,5-dihalogenophenyll-2-methylpropyl ethers represented by formula (II),
(wherein R, X1, and X2 are as defined above, and Y, and Y2 each represents a hydrogen atom, a chlorine atom, a bromine atom or an iodine atom, with at least one of Y, and Y2 being a chlorine, bromine or iodine atom) to remove the chlorine, bromine or iodine atom, which process is carried out in the presence of a hydrogenation catalyst by using as a hydrogenating agent a lower aliphatic alcohol and an alkaline compound selected from among an alkali metal hydroxide and an alkaline earth metal hydroxide. This process enables the compound (I) to be obtained in a high yield without using hydrogen.
一种制备由式(I)代表的3-苯氧基苄基2-(4-烷氧基苯基)-2-甲基丙基醚的工艺。
(其中 R 代表低级烷基,X 和 X2 分别代表氢原子或氟原子)的工艺,该工艺通过氢化由式(II)代表的 3-苯氧基苄基 2-(4-烷氧基-3-卤素苯基)-2-甲基丙基醚或 3-苯氧基苄基 2-(4-烷氧基-3,5-二卤素苯基)-2-甲基丙基醚、
(其中 R、X1 和 X2 如上定义,Y 和 Y2 分别代表氢原子、氯原子、溴原子或碘原子,其中 Y 和 Y2 中至少有一个是氯、溴或碘原子),以除去氯、溴或碘原子、该工艺在氢化催化剂存在下进行,使用低脂醇和碱金属氢氧化物和碱土金属氢氧化物中的碱性化合物作为氢化剂。这种工艺可以在不使用氢气的情况下获得高产率的化合物(I)。