Preparation of nuclear chlorinated aromatic compounds

Details Preparation of nuclear chlorinated aromatic compounds Preparation of nuclear chlorinated aromatic compounds

1998-12-30

1999-11-09

Richter, Johann

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

Organic compounds

Nitriles

560358, 562840, 568656, 570127, 570185, 570251, C07C25500, C07C26300, C07C 5158, C07C 4100

Patent

active

059817895

ABSTRACT:
Disclosed is a method of preparing an aromatic compound having the general formula ##STR1## where R is CF.sub.3, OCF.sub.3, OC.sub.2 F.sub.5, CN, NCO, or COCl, m is 0, 1, or 2, n is 0, 1, or 2, q is 1 or 2, and q+m+n is an integer from 1 to 5. A vapor is prepared of a substrate having the general formula ##STR2## and a chlorinating agent. The mixture is reacted at a temperature above the boiling point of the substrate but below its decomposition temperature. The amount of chlorinating agent is about 0.5 to about 2 times the amount stoichiometrically required to replace the nitro groups on the substrate with chlorine. Unreacted substrate and partially reacted substrate are condensed from the product mixture and are recycled. The substrate is preferably in contact with the chlorinating agent before it is vaporized.

REFERENCES:
patent: 4582948 (1986-04-01), Tang et al.

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