Method of increasing certain isomeric ratios in chlorinating substituted benzenes
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United States of America Patent
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Apr 24, 2001
Grant Date -
N/A
app pub date -
Oct 28, 1999
filing date -
Oct 28, 1999
priority date (Note) -
Expired
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Abstract
Disclosed is a method of increasing the percentage of certain isomers made when di or tri-substituted benzenes are chlorinated in the presence of a Friedel-Crafts catalyst. The use of about 0.001 to about 1 wt % a cocatalyst during chlorination alters the isomeric ratio of the product mixture. In particular, the percentage of the 2,5-isomer is increased when said substituted benzene is ortho or meta-substituted, the percentage of the 3,4-isomer is increased when said substituted benzene is para-substituted, and the percentage of the 2,4,5-isomer is increased when said substituted benzene is 2,4-disubstituted, 3,4-disubstituted, or 2,5-disubstituted.
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