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|Section2= |Section3= }} Ethylenetetracarboxylic acid is an organic compound with formula , or (HO(OC)-)2C=C(-(CO)OH)2. By removal of four protons, the acid yields the anion , ethylenetetracarboxylate, which is one of the oxocarbon anions (consisting solely of oxygen and carbon. By loss of 1 through 3 protons it forms the anions , , and , called respectively trihydrogen-, dihydrogen-, and hydrogenethylenetetracarboxylate. The same names are used for the corresponding esters. The acid can be obtained by hydrolysis of tetraethyl ethylenetetracarboxylate, which in turn can be obtained from diethyl dibromomalonate with sodium iodide.〔B. I. Zapadinskii, B. I. Liogon'kii, and A. A. Berlin (1973), ''Syntheses of Tetracarboxylic Acids''. Russian Chemical Reviews, volume 42 issue 11, page 939. (Online version ) accessed on 2010-01-03.〕 Ethylenetetracarboxylic dianhydride, a twofold anhydride of this compound, is an exotic oxocarbon synthesized by pyrolysis of ethylenetetracarboxilic acid in 1981 by Patterson and others.〔John M. Patterson, Nabeel F. Haidar, Loren L. Braun and Walter T. Smith, Jr. (1981), ''The pyrolytic behavior of ethylenetetracarboxylic acid''. Journal of Analytical and Applied Pyrolysis, Volume 2, Issue 4, Pages 331-337 〕 ==References== 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「ethylenetetracarboxylic acid」の詳細全文を読む スポンサード リンク
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