Synthesis and X-ray Crystal Structures of Bis(oxazolinyl)phenyl-Derived Chiral Palladium(II) and Platinum(II) and -(IV) Complexes and Their Use in the Catalytic Asymmetric Aldol-Type Condensation of Isocyanides and Aldehydes
作者:Yukihiro Motoyama、Hidekazu Kawakami、Kayoko Shimozono、Katsuyuki Aoki、Hisao Nishiyama
DOI:10.1021/om020274q
日期:2002.8.1
treatment with the corresponding silver salts (AgX: X = BF4, OTf, OCOCF3). X-ray structure studies revealed that the octahedral structure of (Phebox)PtIVCl2 fragment G is isosteric with the (Phebox)RhIIICl2 fragment D, and the (Phebox)MII fragment H (M = Pd, Pt) is almost the same configuration with a square-planar structure. In these complexes, the cationic BF4 aqua complexes (9, M = PdII; 10, M = PtII;
(Phebox)SnMe 3(3 ; Phebox = 2,6-双(恶唑啉基)苯基)与PdCl 2(PhCN)2或K [PtCl 3(C 2 H 4)](H 2 O)的金属转移得到(Phebox M II Cl络合物(4,M = Pd;5,M = Pt),产率中等。(Phebox)Pt IV Cl 3配合物8也通过5与作为氧化剂的CuCl 2(H 2 O)2反应而合成。这些氯化物络合物,4,5,和8,分别反过来转化为阳离子络合物通过用相应的银盐(卤化银:X = BF 4,光学传递函数,OCOCF 3)。X射线结构研究表明,(Phebox)Pt IV Cl 2片段G的八面体结构与(Phebox)Rh III Cl 2片段D和(Phebox)M II片段H(M = Pd,Pt)等排。与正方形平面结构几乎相同。在这些配合物中,阳离子BF 4水性配合物(9,M = Pd II;10,M =铂II ;