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Malononitrile reacts in superacidic solutions HF/MF5 (M = As, Sb) with formation of the corresponding salts [H2C(CNX)2][MF6]2 (M = As, Sb; X = H, D). The occurrence of double protonation is strongly dependent on the stoichiometric ratio of the Lewis acid with regard to malononitrile. Deuterated species were obtained by replacing hydrogen fluoride with deuterium fluoride. The double protonated salts...
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