Patent ID: 6331653
Filing Date: 2001-12-18
Classification: C07C

Abstract:
A method for manufacturing 3,4-dihydroxy-3-cyclobutene-1,2-dione represented by the following general formula (III), characterized in that a 3-alkoxy-2,2,4,4-tetrahalogenocyclobutanone derivative represented by the following general formula (I) is treated in the presence of an agent for dehydrohalogenation, to yield a 3-alkoxy-2,4,4-trihalogeno-2-cyclobutene-1-one derivative represented by the following general formula (II), and then the 3-alkoxy-2,4,4-trihalogeno-2-cyclobutene-1-one derivative is further hydrolyzed ##STR10##[wherein, R.sup.1 represents an alkyl group; and R.sup.2, R.sup.3 and X are the same or different and each represents halogen] ##STR11##[wherein, R.sup.1, R.sup.2, R.sup.3 and X have the same meanings as described above] ##STR12##