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脂族、芳族和杂环羧酸在1,1′-草酰二咪唑(LibigsAnn Chem 1979:1756)作脱水剂和甲磺酸存在下,在乙
Aliphatic, aromatic and heterocyclic carboxylic acids are reacted in the presence of 1,1’-oxalydiimidazole (Libigsnn Chem 1979: 1756) as a dehydrating agent and methanesulfonic acid in the presence of