申请人:Lonza AG
公开号:US05786501A1
公开(公告)日:1998-07-28
A process for the purification of alkyl alkylacetoacetates of the general formula: ##STR1## in which R.sup.1 is a C.sub.1 -C.sub.10 -alkyl group and R.sup.2 is a C.sub.1 -C.sub.4 -alkyl group. In the process, an alkyl alkylacetoacetate which contains an alkyl alkenylacetoacetate of the general formula: ##STR2## in which R.sup.1 and R.sup.2 have the above-stated meaning, and/or further by-products as an impurity, is converted with an ester of the general formula: ##STR3## in which R.sup.2 has the above-stated meaning, in the presence of a base, into an intermediate which is separated off.
一种用于纯化一般式为:##STR1## 其中R.sup.1为C.sub.1-C.sub.10烷基,R.sup.2为C.sub.1-C.sub.4烷基的烷基乙酰丙酮酸酯的过程。在该过程中,含有一般式为:##STR2## 其中R.sup.1和R.sup.2具有上述意义,和/或其他副产物作为杂质的烷基乙酰丙酮酸酯与一般式为:##STR3## 其中R.sup.2具有上述意义的酯在碱存在下转化为中间体,然后分离。