报告了1',2',3',4',5'-五甲基氮杂二茂铁(1)的BH 3(2)和BF 3(3)加合物的合成,X射线晶体结构和电化学性质,以及改进的合成,X射线晶体结构和已知化合物的电化学1。13 C NMR数据显示,化学位移对氮孤对配位的相似性与杂芳烃类似物相似。1-3的X射线结构数据表明,在路易斯酸加合物中吡咯基环与铁的键合发生细微变化,在1和3的情况下会发生短暂的分子间接触。在循环伏安法研究中,1显示出可逆的基于金属的氧化,从而可以估算氮在氮杂二茂铁的氧化电位(与二茂铁相比)中对-CH-取代的影响。图2和3没有显示出可逆的电化学。
报告了1',2',3',4',5'-五甲基氮杂二茂铁(1)的BH 3(2)和BF 3(3)加合物的合成,X射线晶体结构和电化学性质,以及改进的合成,X射线晶体结构和已知化合物的电化学1。13 C NMR数据显示,化学位移对氮孤对配位的相似性与杂芳烃类似物相似。1-3的X射线结构数据表明,在路易斯酸加合物中吡咯基环与铁的键合发生细微变化,在1和3的情况下会发生短暂的分子间接触。在循环伏安法研究中,1显示出可逆的基于金属的氧化,从而可以估算氮在氮杂二茂铁的氧化电位(与二茂铁相比)中对-CH-取代的影响。图2和3没有显示出可逆的电化学。
Ferrocenyl-nitrogen donor ligands. Synthesis and characterization of rhodium(I) complexes of ferrocenylpyridine and related ligands
作者:Jaisheila Rajput、Alan T. Hutton、John R. Moss、Hong Su、Christopher Imrie
DOI:10.1016/j.jorganchem.2006.05.048
日期:2006.11
preparation of a series of complexes of the types [RhCl(CO)2(L)], [RhCl(cod)(L)] and [Rh(cod)(L)2]ClO4, where L is a ligand incorporating a ferrocenyl group and a pyridine ring is described. Complexes were characterized using NMR, IR and electronic spectroscopy. The electrochemical behaviour of the complexes was examined using cyclic voltammetry. The X-ray structures of three of the complexes, [RhCl(CO)2NC5
[RhCl(CO)2(L)],[RhCl(cod)(L)]和[Rh(cod)(L)2 ] ClO 4类型的一系列配合物的制备,其中L是掺入的配体描述了二茂铁基和吡啶环。使用NMR,IR和电子光谱对复合物进行表征。使用循环伏安法检查复合物的电化学行为。3复合物的X-射线结构,[的RhCl(CO)2 NC 5 H ^ 4 CNC 6 ħ 4(η 5 -C 5 H ^ 4)的Fe(η 5 -C 5 H ^ 5)}],[RhCl(鳕鱼)(3-Fcpy)]和[RhCl(鳕鱼)3-Fc(C 6 H 4)py}]被确定。
Enantioselective functionalisation of the C-2′ position of 1,2,3,4,5-pentamethylazaferroceneviasparteine mediated lithiation: potential new ligands for asymmetric catalysis
作者:James C. Anderson、James D. Osborne、Thomas J. Woltering
DOI:10.1039/b715323f
日期:——
The s-BuLiâsparteine base combination deprotonated the C-2â² position of 1,2,3,4,5-pentamethylazaferrocene1 and subsequent reaction with a range of electrophiles gave C-2 substituted products in 76â93% yield and â¼80% ee. The products could be recrystallised to enrich ee's to >90%. Resubjection of the initial addition products (â¼80% ee) to the deprotonation conditions led to a kinetic resolution to give products with >90% ee and superior overall yields compared to recrystallisation for the cases where the electrophiles were Ph2CO, MeI and Ph2S2. Transmetallation of the 2-lithiopentamethylazaferrocene (â¼80% ee) with ZnCl2 allowed palladium catalysed cross coupling with a variety of C-2 haloaryl, heteroaryl and vinyl groups to give some novel C-2â² substituted pentamethylazaferrocene derivatives in 61â77% yield in 80% ee. Potential N,N-chelate ligands were recrystallised to >95% ee. A novel C2-symmetric bis-pentamethylazaferrocene 10 could be synthesised by an iron catalysed oxidative coupling of the enatioenriched C-2 lithio derivative and in the presence of a PhMeâEt2O solvent mixture proceeded in 97% ee.