Method for the nuclear chlorination of ortho-xylene
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United States of America Patent
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Aug 16, 2005
Grant Date -
Mar 18, 2004
app pub date -
Sep 10, 2003
filing date -
Sep 12, 2002
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Abstract
A method for the nuclear chlorination of ortho-xylene using a chlorinating agent in the presence of at least one Friedel-Crafts catalyst and chloro-substituted 2,8-dimethylphenoxathiin as co-catalyst. The co-catalyst used is preferably tetrachlorinated 2,8-dimethylphenoxathiin, in particular 1,3,7,9-tetrachloro-2,8-dimethylphenoxathiin of the formula ##STR1##
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