The combination of iron(III) chloride, pyridine‐2,6‐dicarboxylic acid and formamidine ligands allows for the epoxidation of styrenes and conjugated dienes in excellent chemoselectivity and yields.
Highly dispersed Co in porous N-doped carbon is active for oxidation of the C–H bond to ketones under 60 °C and 1 atm O2, which is 41.3 times more active in comparison to ZIF-67-derived Co catalyst.
Investigation of the Dynamic Solution Behavior of Chloro(diene)rhodium(I) Phosphine Complexes with a Pendant Unsaturated Heterocycle at Phosphorus (2-pyridyl, 2-imidazyl; diene = COD, NBD)
作者:Andreas Brück、Klaus Ruhland
DOI:10.1021/om900324a
日期:2009.11.23
Reaction of chloro(diene)rhodium(I) dimer with 2-pyridyl- and 2-imidazylphosphines resulted in the formation of the four-coordinate, square-planar complexes chloro(diene)rhodium-κ1-P-phosphine [diene = 1,5-cyclooctadiene (COD), bicyclo[2.2.1]hepta-2,5-diene (NBD)]. The nitrogen in the β-position to phosphorus provoked a fast exchange of the olefin sites in solution. Influences on this system were investigated
氯的反应(二烯)铑(I)与2-吡啶基和2- imidazylphosphines二聚体导致形成的四个坐标,正方形平面络合物氯(二烯)铑-κ 1 -P-膦[二烯= 1 ,5-环辛二烯(COD),双环[2.2.1]庚-2,5-二烯(NBD)]。β位置的氮到磷引起溶液中烯烃位置的快速交换。通过改变磷,二烯,金属和杂环上的取代基以及杂环的取代方式,研究了对该体系的影响。使用邻位的氘(1- d 1)或三氘甲基(1- Me - d 3)进行其他同位素标记实验在每个COD的烯属位置(1-COD- d 2)的1个氘原子和一个氘原子形成氮原子。这些发现导致了1-Me - d 3和1-COD- d 2的逆动力学同位素效应(KIE)。没有KIE被完全线形分析发现当吡啶基的氮用标记15 N.的温度依赖性Ť 1弛豫时间的第发现吡啶基部分中的β-质子是吡啶基部分与其余配合物相互作用的诊断标准,从而可以估计该相互作用的