申请人:NIPPOH CHEMICALS CO., LTD.
公开号:EP0174844A2
公开(公告)日:1986-03-19
A method for the production of an α-aryl-alkanoic acid represented by the general formula II
wherein R3 stands for a hydrogen atom or an alkyl group and Ar for an aromatic residue, characterized by subjecting an α-haloalkyl-aryl ketal represented by the general formula I:
wherein Ar has the same meaning as defined above. R1 and R2 independently stand for an alkyl group and embrace the case wherein they jointly form a cyclic acetal, R3 has the same meaning as defined above, and X stands for a halogen atom, to a rearrangement reaction in the presence of at least one zinc compound. selected from the group consisting of oxide, hydroxide, sulfide, carbonate, and basic carbonate of zinc and subsequently hydrolyzing the product of the rearrangement reaction.
一种生产通式 II 所代表的 α-芳基烷酸的方法
其中 R3 代表氢原子或烷基,Ar 代表芳香族残基,其特征是将通式 I 所代表的 α-卤代烷基-芳基缩酮加入其中:
其中 Ar 的含义与上述定义相同。R1 和 R2 分别代表一个烷基,在它们共同形成环状缩醛的情况下,R3 的含义与上述定义相同,X 代表一个卤素原子,在至少一种选自氧化锌、氢氧化锌、硫化锌、碳酸锌和碱式碳酸锌的锌化合物的存在下进行重排反应,然后水解重排反应的产物。