Optically active transition-metal complexes VII Iron and ruthenium complexes with the optically active cyclopentadienyl ligand PCp: syntheses and ligand exchange reactions
作者:Bernhard Pfister、Ruedi Stauber、Albrecht Salzer
DOI:10.1016/s0022-328x(96)06849-0
日期:1997.4
The optically active complexes [PCpFe(CO)2]2 and [PCpRu(CO)2]2 (PCp = pinene-fused cyclopentadiene) have been converted into half-sandwich complexes PCpM(CO)2X (XCl, Br, I, CH3, COMe, COPh, COMes) by either oxidative or reductive methods. Ligand exchange of one of the diastereotopic carbonyl ligands for a Lewis base L L = tertiary phosphine or phosphite) generates diastereomeric complexes PCpML(CO)X
旋光配合物[PCpFe(CO)2 ] 2和[PCpRu(CO)2 ] 2(PCp = pin烯稠合的环戊二烯)已转化为半三明治复合物PCpM(CO)2 X(XCl,Br, I,CH 3,COMe,COPh,COMes)通过氧化或还原方法。Lewis碱LL =叔膦或亚磷酸酯的非对映体羰基配体之一的配体交换产生在金属中心具有拟四面体手性的非对映体复合物PCpML(CO)X。非对映异构体比例随着新配体的空间体积的增加而增加,其上限为64%de。使用MRu,对于X =卤素,配位体交换的光化学方法和热方法都可能,不仅会导致非对映异构体的比例不同,而且会导致其非对映异构体的反向比例增加。通过热配体交换产生的光诱导明显更高,并且被证明是热力学起源的。