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)。