METHOD OF PRODUCING CARBOXYPHENOXYCYCLOTRIPHOSPHAZENES Russian patent published in 2025 - IPC C07B41/08 C07F9/6581 C07B41/04 

FIELD: chemistry.

SUBSTANCE: invention relates to organic chemistry, specifically to the technology of producing carboxyphenoxycyclophosphazenes, which can be used as modifiers of dental filling compositions in order to improve the adhesion and mechanical properties of the obtained compositions. Method of producing carboxyphenoxycyclophosphazenes is characterized by that chlorine atoms in chlorocyclophosphazenes are replaced with 4-methylparaben in an acetone medium at temperature of 56 °C for 2 hours, in the presence of molar excess of potassium carbonate. After that, the reaction mass is filtered, acetone is removed under reduced pressure, synthesized 4-methyl-carboxyphenoxycyclophosphazenes are dissolved in tetrahydrofuran, mixing with aqueous sodium tert-butoxide and stirring the obtained solution at room temperature for 3 hours. Further, the solution is precipitated in 1000 ml of acidified water, filtered, repeatedly washed with distilled water and dried in a vacuum drying cabinet to constant weight.

EFFECT: providing a method for synthesis of cyclotriphosphazenes containing reactive carboxyl groups in order to obtain a homogeneous mixture with a basic dental composition.

1 cl, 9 dwg, 2 ex