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US 7,888,534 B2Granted
Diaryl alkylphosphonates and methods for preparing same
AssigneeFrx Polymers, Inc.
InventorsDieter Freitag, Savvas Hadjikyriacou
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Abstract
A method for preparing substantially pure optionally substituted diaryl alkylphosphonates from an optionally substituted triarylphosphite and an optionally substituted trialkylphosphite or an optionally substituted alkanol under special reaction conditions is described.
Claims24
A method for preparing an optionally substituted diaryl alkylphosphonate comprising:
- heating an optionally substituted triarylphosphite to a temperature of from about 210° C. to about 260° C.;
- adding to the heated optionally substituted triarylphosphite a mixture comprising:
- (i) an optionally substituted trialkylphosphite in a molar excess of from at least 10% to about 50% of the optionally substituted triarylphosphite and further a catalyst;
- or
- (ii) an optionally substituted alkanol in a molar excess of from at least 10% to about 50% of the optionally substituted triarylphosphite and further a catalyst;
- and
- reacting the mixture and the heated optionally substituted triarylphosphite to form the optionally substituted diaryl alkylphosphonate wherein the optionally substituted diaryl alkylphosphonate contains less than 1% total product residual triarylphosphite.
4 more elements
A method for preparing optionally substituted diaryl alkylphosphonate comprising:
- combining an optionally substituted triarylphosphite and at least one catalyst to form a triarylphosphite catalytic mixture;
- heating the triarylphosphite catalytic mixture to from about 210° C. to about 260° C.;
- adding to the heated triarylphosphite catalytic mixture:
- (i) an optionally substituted trialkylphosphite in a molar excess of from at least 10% to about 50% of the optionally substituted triarylphosphite;
- or
- (ii) an optionally substituted alkanol in a molar excess of from at least 10% to about 50% of the optionally substituted triarylphosphite;
- and
- reacting the triarylphosphite catalytic mixture and the at least one optionally substituted trialkylphosphite or at least one optionally substituted alkanol to form the optionally substituted diaryl alkylphosphonate wherein the optionally substituted diaryl alkylphosphonate contains less than 1% total product residual triarylphosphite.
5 more elements
Dependencies are inferred from the claim text.