| 摘要 |
A process for the manufacture of uniform, phosphonic compounds selected from the group consisting of phosphonic acids having at least two carbon atoms and at least two phosphorus atoms in their molecule and salts of said acids which consists essentially of the steps of acylating PCl3 with an excess of acylating agents selected from the group consisting of aliphatic and aromatic carboxylic acids having at least two carbon atoms in their molecules in the presence of water or acylating phosphorous acid with an excess of acid chlorides or acid anhydrides of the above acids at elevated temperatures up to the reaction boiling point, cooling the reaction mixture to a temperature above 30 DEG C and below the boiling point of the alcohol added and adding thereto an alcohol selected from the group consisting of methanol, ethanol, propanol, butanol and pentanol, said alcohol being added in amounts of from 1.1 to 20 times the stoichiometrical amount, calculated on said excess of acylating agent, maintaining the reaction mixture in the said temperature range for a time sufficient to form volatile components, and recovering said phosphonic compounds free from impurities.
|
