申请人:Kyowa Yuka Co., Ltd.
公开号:EP1010684A1
公开(公告)日:2000-06-21
The present invention provides a method for manufacturing 3,4-dihydroxy-3-cyclobutene-1,2-dione represented by the following general formula (III) (usual name: "squaric acid") through the following reaction processes 1 ∼ 4, using a vinyl ether represented by the following general formula (V) and a halogenoacetyl halide represented by the following general formula (VI) as starting materials.
[wherein, R1 represents an alkyl group; and R2, R3, R4, and X are the same or different and each represents halogen]
本发明提供了一种以下述通式(V)代表的乙烯基醚和下述通式(VI)代表的卤代乙酰卤为起始原料,通过下述反应过程1∼4制造下述通式(III)代表的3,4-二羟基-3-环丁烯-1,2-二酮(通常名称:"方酸")的方法。
[其中,R1 代表烷基;R2、R3、R4 和 X 相同或不同,且各自代表卤素。]