ポリ酸塩の欠損部位を新しい化学反応空間とした新規のクラスターカチオンサンドイッチ型化合物の設計と合成

概要

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Two types of tetra-zirconium(IV)/hafnium(IV) cluster compounds sandwiched between two di-lacunary α-Keggin polyoxotungstates were synthesized and structurally characterized, i.e., [[{M(H2O)}2{M(H2O)2}2(μ-OH)3(μ3-OH)2](α-1,2-PW10O37)2]7-(M = Zr (1,2-Zr4), Hf (1,2-Hf4)) and [{M4(μ-OH)2(μ3-O)2(H2O)4}(α-1,4-PW10O37)2]8- (M =Zr (1,4-Zr4), Hf (1,4-Hf4)). The former was composed of tetra-M cluster cation species [{M(H2O)}2{M(H2O)2}2(μ-OH)3(μ3-OH)2]11+ sandwiched between two 1,2-di-lacunary α-Keggin polyoxotungstates [α-1,2-PW10O37]9-, while the latter was composed of another tetra-M cluster cation species [M4(μ-OH)2(μ3-O)2(H2O)4]10+ sandwiched between two 1,4-di-lacunary α-Keggin polyoxotungstates [α-1,4-PW10O37]9-. As for 1,2-Zr4 and 1,2-Hf4 as Lewis acid catalysts, their catalytic activities in the Mukaiyama aldol reaction in acetonitrile/water mixed solvent at room temperature in air were evaluated.
2010-06-30