| 摘要 |
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]
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