冠醚二苯并[24]冠-8(DB24C8)与多种二取代的二苄基铵阳离子相互渗透,通过氢键等作用生成[2]伪紫杉烷络合物。1H NMR 光谱测量结果表明,通过对连接在二苄基铵阳离子芳基环上的取代基进行明智的操作,可以精确地控制伪紫杉烷络合物的溶液相结合力。研究发现,络合物的稳定性常数(Kas)与哈梅特取代基常数(Ï)之间存在线性自由能关系(LFER)。对假轴烷的 X 射线晶体学分析表明,它们的每个离散超分子单元都显示出相似的固态超结构。不过,这些分析还表明,这些假轴烷通过无数的超分子间堆积图案相互关联,从而产生了各种新颖的超结构。
Synthesis, characterization, catalytic and biological application of half-sandwich ruthenium complexes bearing hemilabile (κ2-<i>C</i>,<i>S</i>)-thioether-functionalised NHC ligands
作者:Weiguang Chen、Julien Egly、Amalia I. Poblador-Bahamonde、Aline Maisse-Francois、Stéphane Bellemin-Laponnaz、Thierry Achard
DOI:10.1039/c9dt04825a
日期:——
suggesting that the only species observed by the 1H-NMR correspond to an average resonance position of a fluxional mixtures of isomers. All these complexes were found to catalyse the oxydant-free double dehydrogenation of primary amine into nitrile. Ru complexbearing NHC-functionalised S-tBu group was further investigated in a wide range of amines and was found more selective for alkyl amine substrates than
Catalytic Hydrogen Production by Ruthenium Complexes from the Conversion of Primary Amines to Nitriles: Potential Application as a Liquid Organic Hydrogen Carrier
作者:David Ventura-Espinosa、Aida Marzá-Beltrán、Jose A. Mata
DOI:10.1002/chem.201603423
日期:2016.12.5
The potential application of the primary amine/nitrile pair as a liquid organic hydrogen carrier (LOHC) has been evaluated. Ruthenium complexes of formula [(p‐cym)Ru(NHC)Cl2] (NHC=N‐heterocyclic carbene) catalyze the acceptorless dehydrogenation of primary amines to nitriles with the formation of molecular hydrogen. Notably, the reaction proceeds without any external additive, under air, and under
A ligand controlled catalytic system for the aerobicoxidation of 1[degree] amines to nitriles and imines has been developed where the varying [small pi]-acidic feature of BIAN versus phen in the frameworks of ruthenium catalysts facilitates switchable selectivity.
environmentally benign catalyticoxidation reactions. Gaseous oxygen or hydrogenperoxide is used as the oxidant, and water is the only byproduct. When a vanadium complex is used as the catalyst in an ionic liquid, the amine oxidation successfully proceeds with recycling of the catalyst. Amine oxidation with hydrogenperoxide as an oxidant in water is also attained by using copper(II) sulfate as catalyst
A dehydrogenation of primaryamine to give the corresponding nitrileunder oxidant- and base-free conditionscatalysed by simple [Ru(p-cym)Cl2 ]2 with no extra ligand is reported. The system is highly selective for alkyl amines, whereas benzylamine derivatives gave the nitrile product together with the imine in a ratio ranging from 14:1 to 4:1 depending on the substrate. Preliminary mechanistic investigations