申请人:Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
公开号:US04994600A1
公开(公告)日:1991-02-19
A process for preparing trans-.beta.-benzoylacrylic acid ester having the general formula (I): ##STR1## wherein R is alkyl group or aralkyl group, which comprises dealcoholizing .beta.-benzoyl-.alpha.-alkoxypropionic acid ester having the general formula (II): ##STR2## wherein R is above, in the presence of an acid catalyst to give trans-.beta.-benzoylacrylic acid ester having the general formula (I). According to the process of the present invention, the by-product (II) produced in the esterification reaction of .beta.-benzoylacrylic acid (III) with the alcohol (V) by the dehydration reaction can be converted into the compound (I) by the dealcoholization reaction in the presence of the acid catalyst and thus trans-.beta.-benzoylacrylic acid ester (I) with a high purity can be produced in an industrially advantageous manner.
一种制备具有通式(I)的反式-β-苯甲酰丙烯酸酯的方法:
其中R是烷基或芳基烷基,包括在酸催化剂存在下脱醇β-苯甲酰-α-烷氧基丙酸酯,其具有通式(II):
其中R如上,在酸催化剂存在下,将上述化合物转化为具有通式(I)的反式-β-苯甲酰丙烯酸酯。根据本发明的方法,通过酸催化剂存在下的脱醇反应,可以将在β-苯甲酰丙烯酸(III)与醇(V)的酯化反应中产生的副产物(II)转化为化合物(I),从而可以以工业优势的方式生产高纯度的反式-β-苯甲酰丙烯酸酯(I)。