According to the present invention, there is provided a catalytic complex comprising a metal, one or more ligands and one or more counterions, wherein said one or more ligands include a non-racemic chiral ligand and wherein said one or more counterions include a triflimide counterion. Also provided are methods of making said catalytic complex and processes for producing chiral compounds which involve the use of said catalytic complex. In addition, the present invention provides compounds of the formula (2) as defined herein. The compounds of formula (2) may be useful as ligands in catalytic complexes.
Not only symmetrical, but also unsymmetrical α,α‐diaryl allylic alcohols are employed as substrates in the title reaction. A number of arenes and even heteroarenes underwent radical 1,2‐arylmigration (“neophyl rearrangement”) to produce α‐aryl β‐trifluoromethyl ketones. The preferential migration of electron‐deficient arylgroups over electron‐rich ones in unsymmetrical substrates supports the radical
Cumulene Rotaxanes: Stabilization and Study of [9]Cumulenes
作者:Michael Franz、Johanna A. Januszewski、Dominik Wendinger、Christian Neiss、Levon D. Movsisyan、Frank Hampel、Harry L. Anderson、Andreas Görling、Rik R. Tykwinski
DOI:10.1002/anie.201501810
日期:2015.5.26
The stabilization of long [n]cumulenes has traditionally been achieved by placing sterically bulky “protecting groups” at the termini, which shield the reactive carbon chain from unwanted reactions. Herein, we present an alternative strategy: stabilization through threading the sp‐hybridized carbon chain through a phenanthroline‐based macrocycle. The result is stable [9]cumulenerotaxanes that enable
传统上,长[ n ]枯草酮的稳定化是通过在末端放置空间庞大的“保护基”来实现的,该保护基可保护活性碳链免受有害反应的影响。本文中,我们提出了另一种策略:通过将杂化碳链穿入基于菲咯啉的大环中来实现稳定。结果是稳定的[9]异丙苯轮烷,使[ n ]异丙苯的性质随长度的变化成为可能,包括定量UV / Vis光谱,循环伏安法和差示扫描量热法。DFT计算支持了实验结果。
[3]Rotaxanes with Mixed Axles: Polyynes and Cumulenes
作者:Michael Franz、Johanna A. Januszewski、Frank Hampel、Rik R. Tykwinski
DOI:10.1002/ejoc.201900188
日期:2019.6.10
The formation of [3]rotaxanes (Type 2.1 and Type 3) that feature both a polyyne and a cumulene axle were explored. This includes assembly and spectroscopic characterization of a Type 3 [3]rotaxane that features two [9]cumulene axles
According to the present invention, there is provided a catalytic complex comprising a metal, one or more ligands and one or more counterions, wherein said one or more ligands include a non-racemic chiral ligand and wherein said one or more counterions include a triflimide counterion. Also provided are methods of making said catalytic complex and processes for producing chiral compounds which involve the use of said catalytic complex. In addition, the present invention provides compounds of the formula (2) as defined herein. The compounds of formula (2) may be useful as ligands in catalytic complexes.