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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Cyanoform ： ウィキペディア英語版 Cyanoform Cyanoform (tricyanomethane) is a cyanocarbon and derivative of methane with three cyano groups. For many years, chemists have been unable to isolate this compound as a neat, free acid. However, in September 2015, reports surfaced of a successful isolation.〔Soltner, T.; Häusler J.; Kornath A.J. "The Existence of Tricyanomethane" ''Angewandte Chemie International Edition'' 2015. 〕 Dilute solutions of this acid, as well as its salts, have long been well known. Cyanoform ranks as one of the most acidic of the carbon acids with an estimated pKa of -5.1 in water and measured pKa 5.1 in acetonitrile.〔Raamat, E.; Kaupmees, K.; Ovsjannikov, G.; Trummal, A.; Kütt, A.; Saame, J.; Koppel, I.; Kaljurand, I.; Lipping, L.; Rodima, T.; Pihl, V.; Koppel, I. A.; Leito, I. "Acidities of strong neutral Brønsted acids in different media." ''J. Phys. Org. Chem''. 2013, ''26'', 162-170. 〕 The reaction of sulfuric acid with sodium tricyanomethanide in water (a reaction first tried by H. Schmidtmann in 1896 with inconclusive results) is reported to result in the formation of the hydrate (NC)3C−H3O+ or the formation of (''Z'')-3- amino-2-cyano-3-hydroxyacrylamide (H2N)(OH)C=C(CN)CONH2 depending on the precise conditions. The reaction of HCl gas with sodium tricyanomethanide dissolved in THF is reported to yield 1-chloro-1-amino-2,2-dicyanoethylene ((NC)2C=C(NH2)Cl) and its tautomer. ==Isolation== In September 2015 Cyanoform was successfully isolated by a team of scientists at Ludwig Maximilian University of Munich. The team discovered that cyanoform was stable at temperatures below –40° Celsius; previous beliefs were that Cyanoform was stable at room temperature. The isolation confirmed that cyanoform is a colorless liquid.〔Mole, B - Elusive acid finally created https://www.sciencenews.org/article/elusive-acid-finally-created〕 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「Cyanoform」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.