Patent ID: 8471066
Filing Date: 2013-06-25
Classification: C07F

Abstract:
1. A process for preparing a phosphoromonochloridite comprising contacting phosphorus trichloride (PCl 3 ) with an aromatic diol represented by the formula: wherein: in a slurry comprising a portion of the aromatic diol in solid form and comprising a solution phase comprising the remaining portion of the aromatic diol and an organic solvent, wherein the slurry comprises less than 5 mole percent of a nitrogen base, calculated on total moles of the aromatic diol, wherein the organic solvent has a low hydrogen chloride solubility, wherein the molar ratio of the PCl wherein m and R with the proviso that the reaction time is from greater than about 3 hours to less than about 48 hours, that greater than about 95 mole percent of the aromatic diol is converted in the reaction, and that the contacting is conducted at a reaction temperature from greater than about 25° to less than 75° C.