Preparation of arylphosphinic acids
AssigneeStauffer Chemical Company
InventorsWalter L. Magee, Jr., Arthur C. Bayer
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Abstract
Arylphosphinic acids are prepared by reacting an aromatic compound with phosphorus trichloride in the presence of aluminum chloride to form an aluminum/phosphorus complex and then hydrolyzing the complex with aqueous phosphoric acid to form the arylphosphinic acid as an insoluble phase and a soluble aluminum salt. The arylphosphinic acid and aluminum salt are then easily separated.
Claims6
A process for the preparation of arylphosphinic acid comprising reacting an aromatic compound susceptible to electrophilic ring substitution with phosphorus trichloride in the presence of aluminum chloride to form a first reaction product and then reacting said first reaction product with aqueous phosphoric acid, at a strength of at least 10% by weight, to form an insoluble arylphosphinic acid and a soluble aluminum salt.
Dependencies are inferred from the claim text.