Patent ID: 6429320
Filing Date: 2002-08-06
Classification: C07D

Abstract:
A process for purifying compounds, said process comprising:(a) providing a first mixture comprising at least one compound selected from the group consisting of tocopherol compounds and sterol compounds, and an alcohol having from about 10 to about 30 carbon atoms; (b) reacting the first mixture with one or more boron-containing compounds selected from the group consisting of boric acid, alkoxy borates, alkoxy boroxines, phenoxy borates and phenoxy boroxines to form a second mixture comprising one or more orthoborate esters, wherein the mole ratio of combined tocopherol, sterol and alcohol to boron is at least about 2.5:1; (c) heating the second mixture to remove low boiling point components to form a residue comprising the one or more orthoborate esters; (d) contacting the residue with one or more compounds capable of solvolyzing the one or more orthoborate esters to form a third mixture comprising one or more resulting boron-containing compounds, the alcohol and the at least one compound selected from the group consisting of tocopherol compounds and sterol compounds; and (e) recovering the at least one compound selected from the group consisting of tocopherol compounds and sterol compounds.