Oxidation process
AssigneeSyngenta Participations AG
InventorsClive A. Henrick, Randall A. Scheuerman
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Abstract
Preparation of 2,5-dichlorophenol by selectively oxidizing 1,4-dichlorobenzene using a peroxo-, hydroperoxo-, superoxo- or alkylperoxo-vanadium species in the presence of an α-hydroxy-, dibasic-, tribasic- or sulfonic acid.
Claims20
A process for the preparation of 2,5-dichlorophenol which comprises selectively oxidizing 1,4-dichlorobenzene using a peroxo-, hydroperoxo-, superoxo- or alkylperoxo-vanadium species in the presence of an acid selected from an α-hydroxy-, dibasic-, tribasic- or sulfonic acid or mixtures thereof.
A process for preparing dicamba which comprises the steps of,
- a. selectively oxidizing 1,4-dichlorobenzene using a peroxo-, hydroperoxo-, superoxo-, or alkyleroxo-vanadium species in the presence of an acid selected from the group consisting of an α-hydroxy-, dibasic-, tribasic- or sulfonic acid and mixture thereof, to form 2,5-dichlorophenol,
- b. carboxylating the 2,5-dichlorophenol to give 2-hydroxy-3,6-dichlorobenzoic acid,
- c. methylating the 2-hydroxy-3,6-dichlorobenzoic acid and saponifying the product to give dicamba which may be isolated in free acid or salt or ester form.
A process for the preparation of 2,5-dichlorophenol which comprises selectively oxidizing 1,4-dichlorobenzene using a peroxo-, hydroperoxo-, superoxo- or alkylperoxo vanadium species in the presence of an acid selected from the group consisting of phosphoric, alkylphosphonic and arylphosphonic acids.
Dependencies are inferred from the claim text.