Process for the preparing bromoisophithalic acid compound

Details Process for the preparing bromoisophithalic acid compound Process for the preparing bromoisophithalic acid compound

2005-02-15

2005-02-15

Tsang, Cecilia J. (Department: 1625)

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

Organic compounds

Carboxylic acid esters

C562S480000, C562S486000, C562S487000, C562S460000

Reexamination Certificate

active

06855845

ABSTRACT:
The present invention relates to a process for preparing bromoisophthalic acid compounds, particularly 5-bromoisophthalic acid compounds and 4,5-dibromoisophthalic acid compounds comprising brominating an isophthalic acid compound of the general formula (1)wherein R1and R2independently of one another are hydrogen atom or C1-6alkyl, with bromine in a solvent containing sulfur trioxide. The object of the invention is to provide a process for preparing bromoisophthalic acid compounds, particularly 5-bromoisophthalic acid compounds and 4,5-dibromoisophthalic acid compounds in a highly selective manner by using bromine that is industrially inexpensive.

REFERENCES:
patent: 2596945 (1952-05-01), Shokal et al.
patent: 3142701 (1964-07-01), Graham
patent: A 54-32435 (1979-03-01), None
patent: 10114712 (1979-03-01), None
patent: A 61-171452 (1986-08-01), None
patent: A 10-114712 (1998-05-01), None

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