Stitching Phospholanes Together Piece by Piece: New Modular Di- and Tridentate Stereodirecting Ligands
作者:Julio Lloret Fillol、Achim Kruckenberg、Peter Scherl、Hubert Wadepohl、Lutz H. Gade
DOI:10.1002/chem.201101864
日期:2011.12.9
C2‐symmetric dimethyl‐ and diphenylphospholane ligands, which reacted with [Rh(cod)2]BF4 (cod=1,5‐cyclooctadiene) to yield the rhodium complexes [Rh(L)(cod)]BF4 (L=bisphospholane ligands). The corresponding trisphospholane complexes, 11 and 12, were obtained in high yields (81 and 92 %, respectively), and fully characterised by NMR spectroscopy, mass spectrometry and elemental analysis. Whilst in the C3‐symmetric
大量的双齿和三齿2,5-二甲基和2,5-二苯基取代的膦酸酯的模块化一锅合成采用了空气稳定的手性氯化磷鎓氯化物盐和伯胺或NH 4 Cl作为起始原料。这些被转化为C 2对称的二甲基和二苯基膦环烷配体,它们与[Rh(cod)2 ] BF 4(cod = 1,5-环辛二烯)反应生成铑络合物[Rh(L)(cod)] BF 4(L =双膦烷配体)。相应的三膦环配合物11和12,以高收率获得(分别为81%和92%),并通过NMR光谱,质谱和元素分析充分表征。在含有三齿2,5-二甲基膦烷的C 3对称配合物11中,配体对称地结合,发现二苯基取代的配合物12具有不同的配位行为,其中三个磷杂环戊烯基团中只有两个配位观察到金属中心。在B3PW91级别的DFT研究建立了与溶液和固态实验结果一致的最小能量结构。存在于12中的非配位磷杂环戊烯单元通过Au构成的协调允许复杂的进一步修饰我 X(X =氯,C 6 ˚F 5和三(三氟甲基)苯基(˚F