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|Section2= |Section3= }} Amavadin is a vanadium-containing anion found in three species of poisonous ''Amanita'' mushrooms: ''A. muscaria'', ''A. regalis'', and ''A. velatipes''. Amavadin was first isolated and identified in 1972 by Kneifel and Bayer.〔Kneifel, H.; Bayer, E. “Stereochemistry and total synthesis of amavadin, the naturally occurring vanadium anion of ''Amanita muscaria''.” ''J. Am. Chem. Soc.'' 1986, 108:11, pp. 3075–3077. .〕 This anion, which appears as a blue solution, is an eight-coordinate vanadium complex.〔 A Ca2+ cation is often used to crystallize amavadin to obtain a good quality X-ray diffraction.〔 Oxidized amavadin can be isolated as its PPh4+ salt. The oxidized form contains vanadium(V), which can be used to obtain an NMR spectrum. ==Preparation== The formation of amavadin begins with the formation of two tetradentate ligands.〔 :2 HON(CH(CH3)CO2H)2 + VO2+ → 2− + H2O + 4 H+ 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「Amavadin」の詳細全文を読む スポンサード リンク
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