An object of the present invention is to provide a method for reducing a halogenobenzoic acid ester, in which dehalogenation is inhibited, by using a readily available catalyst. The method comprises reducing an ester with hydrogen gas by using an aromatic hydrocarbon as a solvent in the presence of a ruthenium complex represented by the following general formula (1):
RuXY(CO)(L) (1)
where X and Y represent monovalent anionic ligands, and L represents a tridentate aminodiphosphine ligand represented by the following general formula (2):
where R
Z1
represents an alkyl group having 1 to 4 carbon atoms, each R
Z2
represents an alkyl group having 1 to 4 carbon atoms or a halogen atom, any adjacent two R
Z2
s may form a ring, Hal represents a halogen atom, and n represents 0 to 4.
本发明的目的是提供一种通过使用易得到的催化剂来减少卤代
苯甲酸酯的方法,其中脱卤作用被抑制。该方法涉及在芳香族烃溶剂的存在下,使用一种以下通式(1)所表示的
钌配合物将酯与
氢气还原:RuXY(CO)(L)(1),其中X和Y代表单价阴离子
配体,L代表一种由以下通式(2)所表示的三齿胺二
膦配体:其中RZ1代表具有1至4个碳原子的烷基,每个RZ2代表具有1至4个碳原子的烷基或卤素原子,任何相邻的两个RZ2可以形成环,Hal代表卤素原子,n代表0至4。