Homogeneous Catalysis with Dicationic PdII Complexes: Aldol reaction of methyl isocyanoacetate with benzaldehyde
Homogeneous Catalysis with Dicationic PdII Complexes: Aldol reaction of methyl isocyanoacetate with benzaldehyde
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双阳离子 PdII 配合物的均相催化：异氰乙酸甲酯与苯甲醛的羟醛反应
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
M. Wörle
中科院分区：
文献类型：
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作者：
R. Nesper;P. Pregosin;Kurt Püntener;M. Wörle
合成了一系列含二齿、三齿氮和二齿膦配体（其中一些是手性配体）的双阳离子钯Ⅱ-乙腈配合物的BF_4盐。其中两个化合物[Pd（CH_3CN）_2（bipy）]（BF_4）_2（4）和[Pd（CH_3CN）_（（pybox）（i-Pr））]（BF_4）_2（（S，S）-pybox（i-Pr）= 2，6-bis[（S）-4′-isopropyloxazolin-2′-yl]pyridine，5）的分子结构用X射线衍射法测定。所有这些配合物被证明是有效的均相催化剂的羟醛型缩合的异腈，异氰基乙酸甲酯，与苯甲醛。合成了两个异腈配合物[Pd（2，2 ′-bipyridine）（CNCH_2COOCH_3）_2]（BF_4）_2和[Pd（（S，S）-pybox（i-Pr））（CNCH_2COOCH_3）]（BF_4）_2。
A series of dicationic PdII-acetonitrile complexes containing bi- and tridentate nitrogen and bidentate phosphine ligands (some of which are chiral) has been prepared as their BF4 salts. The molecular structures for two of these, [Pd(CH3CN)2(bipy)] (BF4)2 (4) and [Pd(CH3CN)((pybox)(i-Pr))] (BF4)2((S,S)-pybox(i-Pr) = 2,6-bis[(S)-4′-isopropyloxazolin-2′-yl]pyridine, 5) have been determined by X-ray diffraction. All of these complexes are shown to be effective homogeneous catalysts for the aldol-type condensation of the isonitrile, methyl isocyanoacetate, with benzaldehyde. Two isonitrile complexes, [Pd(2,2′-bipyridyl)(CNCH2COOCH3)2] (BF4)2 and [Pd((S,S)-pybox(i-Pr))(CNCH2COOCH3)] (BF4)2, have also been prepared.