Preparation of 1,4-dichlorobenzene

Details Preparation of 1,4-dichlorobenzene Preparation of 1,4-dichlorobenzene

1986-07-07

1988-02-23

Evans, J. E.

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

502217, 502226, 502231, 570210, C07C 1724, C07C 1712

Patent

active

047272015

ABSTRACT:
1,2-dichlorobenzene is isomerized to 1,4-dichlorobenzene in the presence of a catalyst comprising (a) at least one of AlCl.sub.3 and AlBr.sub.3 and (b) at least one of iodine, alkaline earth metal halides and sulfates and lanthanide halides. Benzene and/or dichlorobenzene is chlorinated with free chlorine in the presence of a catalyst composition comprising (a) at least one suitable metal halide (preferably AlCl.sub.3, SbCl.sub.5 or FeCl.sub.3) and (b) free iodine and/or at least one organic iodo-compound (preferably methyl iodide or p-iodochlorobenzene), so as to obtain a reaction product comprising 1,4-dichlorobenzene). A preferred catalyst composition comprises (a) at least one of AlCl.sub.3 and AlBr.sub.3, (b) free iodine and (c) at least one of alkaline earth metal halides, alkaline earth metal sulfates and lanthanide halides.

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Beilsteins Handbuch der Organischen Chemie, Vierten Ergaenzungswerk, Fuenfter Band, 1978, pp. 647, 648 and 654.
Beilsteins Handbuch der Organischen Chemie, Erstes Ergaenzungswerk, Fuenfter Band, 1930, pp. 110/111.

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