Diphosphine Capsules for Transition-Metal Encapsulation
作者:Tehila S. Koblenz、Henk L. Dekker、Chris G. de Koster、Piet W. N. M. van Leeuwen、Joost N. H. Reek
DOI:10.1002/asia.201100092
日期:2011.9.5
characterization of novel heterodimeric diphosphinecapsules formed by multiple ionic interactions and composed of one tetracationic diphosphine ligand and one complementary tetraanionic calix[4]arene are described. Encapsulation of a palladium atom within a diphosphinecapsule is achieved successfully by using the metal complex of the tetracationic diphosphine ligand for the assembly process. In this
描述了由多种离子相互作用形成的,由一个四阳离子二膦配体和一个互补的四阴离子杯[4]芳烃组成的新型异二聚二膦胶囊的自组装和表征。通过将四阳离子二膦配体的金属配合物用于组装过程,成功地实现了钯原子在二膦胶囊中的封装。在这种金属封装的模板化方法中,过渡金属配合物是胶囊的组成部分,过渡金属位于胶囊内部,并且不参与组装过程。我们提出了两种通过混合预充电的构建基块在甲醇中的溶液和混合中性构建基块在甲醇中的溶液进行胶囊组装的方法。p C 6 H 4 CH 2铵,m C 6 H 4铵和m C 6 H 4胍)。这些具有不同柔韧性和形状的四阳离子结构单元很容易结合到具有适当荚膜结构的胶囊中,如1 H NMR光谱,1D NOESY,ESI-MS和建模研究所示。
Versatile Ligands for Palladium-Catalyzed Asymmetric Allylic Alkylation
作者:Peter Dierkes、Shailesh Ramdeehul、Laurent Barloy、Andre De Cian、Jean Fischer、Paul C. J. Kamer、Piet W. N. M van Leeuwen、John A. Osborn
Palladium complexes of the chiral diphosphanes 1 and 2 which possess a rigid backbone and a large bite angle catalyze the alkylation of allyl compounds with both high enantioselectivities and reaction rates, particularly with less sterically demanding substrates. 1: R=Me, X=S; 2: R=H, X=C(CH3 )2 .
Bis(metallo) Capsules Based on Two Ionic Diphosphines
作者:Tehila S. Koblenz、ing. Henk L. Dekker、Chris G. de Koster、Piet W. N. M. van Leeuwen、Joost N. H. Reek
DOI:10.1002/asia.201100073
日期:2011.9.5
heterodimeric diphosphine capsules formed by multiple ionic interactions are described. The first type of capsules is composed of one novel tetrasulfonato‐xantphos ligand and one complementary tetraammonium calix[4]arene. Encapsulation of a transition metal is achieved by self‐assembly of a rhodium complex containing the tetraanionic diphosphine ligand and a tetracationic calix[4]arene. The second type of capsules
描述了由多种离子相互作用形成的异二聚二膦胶囊的自组装和表征。第一类胶囊由一个新的四磺基-黄原磷配体和一个互补的四铵杯[4]芳烃组成。过渡金属的包封是通过自组装包含四阴离子二膦配体和四阳离子杯[4]芳烃的铑配合物实现的。第二种胶囊由两个带相反电荷的二膦配体组成:一个四磺基黄嘌呤和一个四铵二膦(黄磷,DPEphos和1,2-双(二苯基膦基)乙烷(dppe)型)。双(金属)胶囊,即同时封装两种不同的过渡金属,通过自组装包含四阳离子配体的钯或铂配合物和包含四阴离子配体的铑配合物而创建。具有不同柔韧性和形状的二膦配体组装成具有适当荚膜结构的金属胶囊,如1 H NMR和1D-NOESY光谱,ESIMS和建模研究。