Process for the preparation of triarylboranes
AssigneeE. I. Du Pont de Nemours and Company
InventorsNicholas Nazarenko, William Carl Seidel
Life of this patent
Estimating the term…
Abstract
Preparation of triarylboranes, e.g. triphenylborane by reacting an alkali metal, e.g. sodium; an organohalide, e.g. chlorobenzene and an orthoborate ester, e.g. triisopropylorthoborate in an inert organic solvent, recovering the borane by contacting the reaction product with water while maintaining the ratio of borane to hydrolysis products (e.g. borinic acid) at at least 13/1, distilling volatiles from the aqueous mixture and contacting the resultant material with acid to a pH not less than about 6 to form the borane.
Claims7
In a process for the preparation of triarylboranes by reacting an alkali metal, an aryl halide and a borate ester in an inert organic solvent at a ratio of halide to ester in the range of about 3.5:1 to 3:1 and thereafter contacting the reactants with water to obtain an aqueous solution of the alkali metal hydroxide salt of the triarylborane, the improvement which comprises recovering said triarylborane, the improvement which comprises recovering said triarylborane by acidifying said aqueous solution of a pH not less than about 6 to precipitate the borane and thereafter separating the triarylborane from the aqueous solution.
Dependencies are inferred from the claim text.