Process for the preparation of halogenated aromatics
申请人:Bayer Aktiengesellschaft
公开号:US05306849A1
公开(公告)日:1994-04-26
Halogenated aromatics are prepared by heating halogenoformic acid esters to 80.degree. to 280.degree. C. in the presence of hydrogen fluoride or a catalytic amount of one or more Lewis acids from the group comprising aluminium halides, iron halides and antimony halides, and in the liquid phase.
Liquid-Phase Decarboxylation of Aromatic Haloformates: A New Access to Chloro- and Fluoroaromatics
作者:Norbert Lui、Albrecht Marhold、Michael H. Rock
DOI:10.1021/jo9716486
日期:1998.4.1
1 with a Lewis acid in the liquid phase resulted in decarboxylation to the corresponding chloroaromatics 2. Fluoroaromatic compounds were synthesized from phenylchloroformates 1 through a sequential fluorination/decarboxylation in the liquid phase by treatment with excess anhydroushydrogenfluoride under mild conditions. In all cases, yields were increased by performing the reaction in 1,2,4-trichlorobenzene