申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0688770A2
公开(公告)日:1995-12-27
A process for preparing a hydroxyflavan compound which comprises reacting a polyhydric phenol compound of formula (2):
wherein at
least one of W, X, Y and Z is hydroxy;
with a ketone in the presence of (i) an acid catalyst and (ii) water and/or a seed crystal, using an organic solvent which is insoluble in water, produces the hydroxyflavan compound in high yield and with high selectivity while maintaining high conversion of the polyhydric phenol.
一种制备羟基黄烷化合物的工艺,包括使式(2)的多水酚化合物发生反应:
其中
其中 W、X、Y 和 Z 中至少有一个是羟基;
与酮在(i)酸催化剂和(ii)水和/或籽晶存在下,使用不溶于水的有机溶剂,以高收率和高选择性生产羟基黄烷化合物,同时保持多氢苯酚的高转化率。