申请人:OCCIDENTAL CHEMICAL CORPORATION
公开号:EP0077853A1
公开(公告)日:1983-05-04
Novel meta- and para-trifluoromethyl benzal chlorides and ring-halogenated derivatives are useful chemical intermediates for the preparation of meta- and para-trifluoromethyl benzaldehydes and various other useful end products. The novel compounds can be prepared from readily-available xylene starting materials in a process comprising (a) chlorinating meta- or para-xylene, or a ring-halogenated meta- or para-xylene, to form a trichloromethyl benzal chioride product and (B) reacting the trichloromethyl benzal chloride product with about 3 moles or less of anhydrous hydrogen fluoride in the presence of a halogen exchange catalyst.
新型的偏三氟和对三氟甲基苯甲醛氯化物和环卤化衍生物是制备偏三氟和对三氟甲基苯甲醛及其他各种有用最终产品的有用化学中间体。这些新型化合物可以用现成的二甲苯起始原料通过以下工艺制备:(a) 氯化间二甲苯或对二甲苯,或环卤化间二甲苯或对二甲苯,形成三氯甲基苯甲酰氯产物;(B) 在卤素交换催化剂存在下,使三氯甲基苯甲酰氯产物与约 3 摩尔或更少的无水氟化氢反应。