克酮酸合成新方法研究

Study on the New Synthetic Process of Croconic Acid

研究了克酮酸的新合成路线，以四氯苯醌为原料，经甲氧基化，水解，氧化脱羧三步制得高纯度的克酮酸。和从乙二醛出发的传统制法相比，该路线原料易得，条件温和，总收率可达３５％，远高于传统法的约１０％

Croconic acid(or 4,5dihydroxy4cyclopentene1,2,3trione) is a key intermediate for near IR croconic dyes. The new synthetic route from chloranil(tetrachloro1,4benzoquinone) through methoxylation, hydroxylation and decarboxylation was studied. This route gives better yield(35%) than the traditional one through glyoxaltripolymerization(<10%).