Process for the preparation of bromoisophthalic acid compounds
申请人:——
公开号:US20040015010A1
公开(公告)日:2004-01-22
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)
1
wherein R
1
and R
2
independently of one another are hydrogen atom or C
1-6
alkyl, 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.
PROCESS FOR THE PREPARATION OF BROMOISOPHTHALIC ACID COMPOUNDS
申请人:Nissan Chemical Industries, Ltd.
公开号:EP1293495A1
公开(公告)日:2003-03-19
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 R1 and R2 independently of one another are hydrogen atom or C1-6 alkyl, 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.