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US 5,296,634 AGranted
Method for preparing 4-alkylsulfonyl-2-chloro-m-xylene
AssigneeNissan Chemical Industries, Ltd.
InventorsMasatoshi Baba, Eiichi Oya
Life of this patent
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Abstract
The present invention provides a method for preparing a 4-alkylsulfonyl-2-chloro-m-xylene useful as an intermediate for agricultural chemicals.
Claims8
A method for preparing a 4-alkylsulfonyl-2-chloro-m-xylene of the formula (E):
- ##STR3## wherein R is a C.sub.1-8 alkyl group or a C.sub.3-8 cycloalkyl group, which comprises reacting a reducing agent with a 4-alkylsulfonyl-6-bromo-2-chloro-m-xylene of the formula (D-2):
- ##STR4## wherein R is as defined above and the reducing agent comprises hydrogen and one or more catalysts selected from the group consisting of palladium, platinum, ruthenium, Raney nickel, platinum oxide and ruthenium oxide.
A method for preparing a 4-alkylsulfonyl-6-bromo-2-chloro-m-xylene of the formula (D-2):
- ##STR5## wherein R is a C.sub.1-8 alkyl group or a C.sub.3-8 cycloalkyl group, which comprises reacting a chlorinating agent with a 4-alkylsulfonyl-6-bromo-m-xylene of the formula (D-1):
- ##STR6## wherein R is as defined above and the chlorinating agent is one or more members selected from the group consisting of chlorine, hypochlorous acid, sulfuryl chloride, N-chlorosuccinimide and trichloroisocyanuric acid.
Dependencies are inferred from the claim text.