Method for the nuclear chlorination of ortho-xylene

Details Method for the nuclear chlorination of ortho-xylene Method for the nuclear chlorination of ortho-xylene

2005-08-16

2005-08-16

Keys, Rosalynd (Department: 1621)

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

Organic compounds

Halogen containing

C570S208000, C570S210000

Reexamination Certificate

active

06930216

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

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