Unsymmetric bidentate ligands in metal-catalyzed carbonylation of alkenes.
Unsymmetric bidentate ligands in metal-catalyzed carbonylation of alkenes.
复制标题
金属催化烯烃羰基化中的不对称二齿配体。
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
K. Nozaki
中科院分区：
文献类型：
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作者：
K. Nozaki
综述了不对称双齿配体的特点，其中两个配位原子不等价，重点介绍了它们在金属催化烯烃羰基化反应中的应用。在铑催化的氢化反应中，使用配体9实现了对多种底物的高对映选择性。不对称配体21 e在Pd催化的1-烯烃与CO交替共聚合反应中表现出高的产率和高的区域选择性和对映选择性，特别是在催化循环的单步骤的光谱观察中，电子不对称性的优势得到了证实。
Characteristic features of unsymmetric bidentate ligands, in which the two coordination atoms are not equivalent, are reviewed with a focus on their use in metal-catalyzed olefin carbonylations. High enantioselectivity for a variety of substrates was achieved using ligand 9 in Rh-catalyzed hydroformylation. Unsymmetric ligand 21e shows high productivity accompanied by high regio- and enantioselectivities in the Pd-catalyzed alternating copolymerization of 1-alkene with CO. The advantages of electronic unsymmetry are demonstrated especially in the spectroscopic observation of single steps involved in catalytic cycles.