通过用衍生自α-叔-Bu-取代的叔苄基胺的新的手性邻钯酸化拆分剂色谱分离其非对映异构体加合物,以对映纯状态获得单齿膦PBu t C 6 H 4 Br-4的两种对映体。使用1确定Palladacycle的构象和膦的绝对构型1 H NMR光谱法(包括NOE技术),并通过两种非对映体复合物的X射线衍射研究证实。在回收起始拆分剂的情况下,将分解的膦的对映异构体从钯(II)配合物的各个非对映异构体中置换出来,并以钯(II)的双核配位配合物的形式捕获。
ortho-palladated α-phenylalkylamines for enantiomeric purity determination of monodentate P∗-chiral phosphines
摘要:
Three ortho-palladated complexes were tested as chiral derivatizing agents for enantiomeric excess determination of monodentate P-*-chiral phosphines by P-31 NMR analysis. The complexes containing a bulky substituent at the alpha-C-* - 1e or an N-*-stereocentre 1d are shown to be more efficient as compared to known N-achiral alpha-methyl substituted analogues. The structure and stereochemistry of the new dimeric complex (S-c)-1e was established by X-ray analysis. (C) 1997 Published by Elsevier Science Ltd.