Metal complex catalyst and preparation method of 2, 4, 4-trimethyl adipic acid

The invention relates to a metal complex catalyst and a preparation method of 2, 4, 4-trimethyl adipic acid. The metal complex catalyst is used for preparing 2, 4, 4-trimethyl adipic acid, the metal complex catalyst comprises a transition metal salt and a ligand, the ligand is selected from at least one of # imgabs 0 # imgabs 1 #, R1 is selected from halogen elements, hydrogen, methyl, ethyl or methoxyl, R2 is selected from halogen elements, hydrogen, methyl, ethyl, tert-butyl or methoxyl, R3 is selected from halogen elements, hydrogen, methyl, ethyl, tert-butyl or methoxyl, and R4 is selected from halogen elements, hydrogen, methyl, ethyl, tert-butyl or methoxyl. And R3 and R4 are respectively and independently selected from hydrogen or methyl. The metal complex catalyst can be used for selectively preparing the 2, 4, 4-trimethyl adipic acid, and the 2, 4, 4-trimethyl adipic acid with high purity and high yield can be obtained through simple crystallization post-treatment. 本发明涉及一种金属配合物催化剂以及2,4,4-三甲基己二酸的制备方法。