Preparation of halogenated benzene derivatives
AssigneeTosoh Corporation
InventorsToshio Hironaka, Kazuhiko Sekizawa, Yukihiro Tsutsumi
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Abstract
In the liquid phase chlorination of benzene derivatives including benzene per se in the presence of a zeolite possessing the main pores having the opening formed of a 12-membered oxygen ring; para-substituted chlorinated benzene derivatives are preferentially obtained by adding a small quantity of a quaternary ammonium salt or salts to the reaction mixture.
Claims13
A process for preparing para-substituted halogenated benzene derivatives comprising subjecting a benzene derivative to halogenation by reacting the bezene derivative with elementary halogen in the liquid phase in the presence of a catalyst comprising a zeolite possessing the main pores which have the opening formed of a 12-membered oxygen ring;
- wherein at least one quaternary ammonium salt is present in the reaction system.
Dependencies are inferred from the claim text.