The present invention relates to a method of preparing a tocopherol or protected tocopherol with a reduced content of phenolic compound or protected phenolic compound, particularly of (2R,3R)-2,3,4,6,7-pentamethyl-2- (4,8,12-trimethyltridecyl)-2,3-dihydrobenzofuran-5-ol or (2R,3R)-2,3,4,6,7- pentamethyl-2-(4,8,12-trimethyltridecyl)-2,3-dihydrobenzofuran-5-yl acetate, comprising the step of contacting tocopherol or protected tocopherol in neat or in the form of a highly concentrated solution with an acid activated bleaching earth. This method is rather efficient in removal of substantial amounts of this impurity.
本发明涉及一种制备
生育酚或保护
生育酚的方法,其减少了
酚类化合物或保护
酚类化合物的含量,特别是(2R,3R)-2,3,4,6,7-五甲基-2-(4,8,12-三甲基
十三烷基)-
2,3-二氢苯并呋喃-5-醇或(2R,3R)-2,3,4,6,7-五甲基-2-(4,8,12-三甲基
十三烷基)-
2,3-二氢苯并呋喃-5-乙酸酯的方法,包括将
生育酚或保护
生育酚与酸活化漂
白土接触的步骤,无论是在纯净形式还是高浓度溶液形式。这种方法在去除大量杂质方面非常有效。