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A series of β-keto acids can be α-functionalized by a series of glycols to produce some C-glycosides shown asfollows[1]:Comparatively,a series ofβ-keto acids also can beα-functionalized by a series of 2-cyclohexen-1-one derivetivesto produce some decarboxylative 1,5-dione derivatives [2].These series of the reactions experienced 1,4-addtionof β-keto acids toward ketene.