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|Section2= |Section3= }} Acetic oxalic anhydride is an organic compound with formula or (H3C-(C=O)-O-(C=O)-)2. It can be viewed as a mixed anhydride, formally derived from acetic acid (H3C-(C=O)OH) and oxalic acid ((-(C=O)OH)2), in 2:1 molecular ratio, by the loss of two water molecules. It is an unstable colorless crystalline solid, soluble in diethyl ether, that decomposes at about −3 °C into acetic anhydride (-(C=O)-)2O, carbon dioxide () and carbon monoxide (CO). It is hydrolyzed by water into acetic and oxalic acids.〔 Unlike some other anhydrides, it cannot be obtained directly from the acids. It was synthesized in 1953 by W. Edwards and W. M. Henley, by reacting silver oxalate () suspended in diethyl ether with acetyl chloride at temperatures below −5 °C and distilling off the solvent under low pressure. It can also be obtained by reacting anhydrous oxalic acid with ketene (=C=O).〔W. R. Edwards and Walter M. Henley (1953), ''Acetic Oxalic Anhydride''. J. Am. Chem. Soc., volume 75, issue 14, pages 3857-3859. 〕 Acetic oxalic anhydride was conjectured to be an intermediate in the decomposition of anhydrous oxalic acid by acetic anhydride.〔 ==See also== * Oxalic anhydride 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Acetic oxalic anhydride」の詳細全文を読む スポンサード リンク
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