Process for preparing aryldiphosphate esters

Details Process for preparing aryldiphosphate esters Process for preparing aryldiphosphate esters

1990-11-13

1994-01-25

Reamer, James H.

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

Organic compounds

Phosphorus esters

558110, C07F 909

Patent

active

052817415

ABSTRACT:
A process is provided for preparing an aryl diphosphate ester containing less than 5% by weight of triarylphosphate. The process reacts a solution of a dihydroxy aromatic compound and an excess of phosphorus oxychloride in a nonaqueous solvent having a boiling point greater than 110.degree. C. The excess phosphorus oxychloride and part of the solvent are distilled from the solution at atmospheric pressure and the intermediate, a diphosphotetrachloridate solution, is reacted with a monohydric aryl compound. After extracting with an aqueous, alkaline solution the product is recovered by distilling off the remaining solvent.

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