Novel trifluoromethyl benzal chlorides and process for the preparation thereof
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.