Process for preparing 1-alkyl-4-(2-chloro-3-alkoxy-4-alkylsulfon

Details Process for preparing 1-alkyl-4-(2-chloro-3-alkoxy-4-alkylsulfon Process for preparing 1-alkyl-4-(2-chloro-3-alkoxy-4-alkylsulfon

1998-03-24

2000-01-18

Higel, Floyd D.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

5483641, 5483657, 5483661, 5483664, 5483667, 5483671, 562429, 562432, 562474, 562840, 568 35, C07D23120, C07D23108, C07D40312, C07C31500, C07C32300, C07C31900

Patent

active

060159111

ABSTRACT:
Herbicidal 1-alkyl-4-(2-chloro-3-alkoxy-4-alkylsulfonylbenzoyl)-5-hydroxypyrazole compounds, as well as 1-halo-2-chloro-3-alkoxy-4-alkylsulfonylbenzene compounds and 2-chloro-3-alkoxy-4-alkylsulfonylbenzoic acid compounds, were prepared in good yield by the reaction of the corresponding 3-chloro compound with an alkali metal alkoxide compound. 1-Halo-2-chloro-3-alkoxy-4-alkylsulfonylbenzene and 1-halo-2,3-dichloro-4-alkylsulfonylbenzene compounds were converted to compounds having hydroxycarbonyl, alkoxycarbonyl, or 1-alkyl-5-hydroxypyrazole-4-carbonyl substituents in place of the 1-halo substituent by reaction with carbon monoxide and water, an alcohol, or a 1-alkyl-5-hydroxypyrazole compound, respectively, in the presence of a palladium II salt:trihydrocarbylphosphine complex type catalyst.

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