chlorination of o - xylene
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The nuclear chlorination of ortho-xylene is known and is customarily performed in the presence of Friedel-Crafts catalysts, for example Fe, FeCl3, SbCl3 or SbCl5. The mononuclear chlorination produces in this manner a mixture of 4-chloro- and 3-chloro-isomers in a ratio of less than 1.5:1 (U.S. Pat.
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