Method of making chlorobenzenes

Details Method of making chlorobenzenes Method of making chlorobenzenes

1996-06-10

1998-01-20

Rotman, Alan L.

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

Organic compounds

Halogen containing

570209, 570201, 570191, 570194, C07C 2208, C07C 2508, C07C 2510

Patent

active

057103550

ABSTRACT:
Disclosed is a method of making a chlorobenzene having the general formulas ##STR1## where X is Cl or F, and X' is X or CF.sub.3. A compound having the formula ##STR2## is sulfonated using at least 2 moles per mole of said compound of a sulfonating agent selected from the group consisting of sulfuric acid, chlorosulfonic acid, and mixtures thereof, to produce a sulfonated compound. The sulfonated compound is chlorodesulfonated to produce a chlorobenzene, such as 1,2,4-trichlorobenzene. Preferably, the starting material is ortho-dichlorobenzene.

REFERENCES:
patent: 3897321 (1975-07-01), Blank et al.
patent: 4012442 (1977-03-01), Blank et al.
patent: 4778932 (1988-10-01), Manami et al.

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