N,N,O-Coordinated tricarbonylrhenium precatalysts for the aerobic deoxydehydration of diols and polyols
作者:Jing Li、Martin Lutz、Robertus J. M. Klein Gebbink
DOI:10.1039/d0cy00618a
日期:——
Rhenium complexes are well known catalysts for the deoxydehydration (DODH) of vicinaldiols (glycols). In this work, we report on the DODH of diols and biomass-derived polyols using L4Re(CO)3 as precatalyst (L4Re(CO)3 = tricarbonylrhenium 2,4-di-tert-butyl-6-(((2-(dimethylamino)ethyl)(methyl)amino)methyl)phenolate). The DODH reaction was optimized using 2 mol% of L4Re(CO)3 as precatalyst and 3-octanol
[EN] ORGANOMETALLIC COMPLEXES OF SEQUENTIAL TETRADENTATE MONOANIONIC LIGANDS AND USES THEREOF IN RING OPENING POLYMERIZATION OF CYCLIC ESTERS<br/>[FR] COMPLEXES ORGANOMÉTALLIQUES DE LIGANDS MONOANIONIQUES TÉTRADENTÉS SÉQUENTIELS ET LEURS UTILISATIONS DANS LA POLYMÉRISATION PAR OUVERTURE DE CYCLE D'ESTERS CYCLIQUES
申请人:RAMOT AT TEL-AVIV UNIV LTD
公开号:WO2017137990A1
公开(公告)日:2017-08-17
A new family of mononuclear organometallic complexes of a divalent metal bound to sequential tetradentate monoanionic ONNN}-type ligands, and polymerization of cyclic esters such as lactides utilizing same are provided. Novel tetradentate monoanionic ONNN}-type ligands usable for forming these complexes are also provided.
Mononuclear Phenolate Diamine Zinc Hydride Complexes and Their Reactions With CO<sub>2</sub>
作者:Neil J. Brown、Jonathon E. Harris、Xinning Yin、Ian Silverwood、Andrew J. P. White、Sergei G. Kazarian、Klaus Hellgardt、Milo S. P. Shaffer、Charlotte K. Williams
DOI:10.1021/om400679n
日期:2014.3.10
using VT-NMR spectroscopy and X-ray diffraction experiments. These data indicate that the complexes exhibit mononuclear structures at 298 K, both in the solid state and in solution (d8-toluene). At 203 K, the NMR signals broaden, consistent with an equilibrium between the mononuclear and dinuclearbis(μ-hydrido) complexes. All three zinc hydride complexes react rapidly and quantitatively with carbon dioxide
三种前配体2-叔丁基-4-[叔丁基( 1 )/甲氧基( 2 )/硝基( 3 )]-6-[(2′-二甲氨基乙基)的合成、表征和锌配位化学描述了甲氨基]甲基}苯酚。的配位体的每一种与二乙基锌,得到反应乙基锌络合物4 - 6 ; 这些复合物随后与phenylsilanol反应,得到锌硅氧化物的复合物7 - 9。最后,氧化锌配合物与苯基硅烷反应生成三种新的氢化锌配合物10 – 12。新的综合体4– 12 种已通过 NMR 光谱、质谱和元素分析进行充分表征。已使用 VT-NMR 光谱和 X 射线衍射实验探测了氢化锌配合物的结构。这些数据表明,该复合物在 298 K 下呈现单核结构,无论是在固态还是在溶液中(d 8 -甲苯)。在 203 K 时,NMR 信号变宽,与单核和双核双(μ-氢化)配合物之间的平衡一致。在 298 K 和 1 bar 的压力下,所有三种氢化锌配合物均与二氧化碳快速、定量地反应
σ-Insertive Mechanism versus Concerted Non-insertive Mechanism in the Intramolecular Hydroamination of Aminoalkenes Catalyzed by Phenoxyamine Magnesium Complexes: A Synthetic and Computational Study
作者:Xiaoming Zhang、Sven Tobisch、Kai C. Hultzsch
DOI:10.1002/chem.201406468
日期:2015.5.18
in a concerted non‐insertive NC ring closure with concurrent amino proton transfer from the amine onto the olefin, effectively combining the insertion and protonolysis step to a single step. The alternative mechanistic scenario involves a reversible olefin insertion step followed by rate‐determining protonolysis. DFT reveals that a proton‐assisted concerted NC/CH bond‐forming pathway is energetically
A Comparison of Gallium and Indium Alkoxide Complexes as Catalysts for Ring-Opening Polymerization of Lactide
作者:Alexandre B. Kremer、Ryan J. Andrews、Matthew J. Milner、Xu R. Zhang、Tannaz Ebrahimi、Brian O. Patrick、Paula L. Diaconescu、Parisa Mehrkhodavandi
DOI:10.1021/acs.inorgchem.6b02433
日期:2017.2.6
Lewis acidity on the polymerization activity of group 13 metal complexes was studied, and it was shown that, within the same ligand family, indium complexes are far more reactive and selective than their gallium analogues. To this end, gallium and aluminum complexes supported by a tridentate diaminophenolate ligand, as well as galliumcomplexes supported by N,N′-ethylenebis(salicylimine)(salen) ligands
研究了金属尺寸和路易斯酸度对第13组金属配合物聚合活性的影响,结果表明,在相同的配体家族中,铟配合物比其镓类似物具有更高的反应性和选择性。为此,合成了由三齿二氨基酚盐配体支撑的镓和铝配合物,以及由N,N′-亚乙基双(水杨酰亚胺)(salen)配体支撑的镓配合物,并将其与铟类似物进行比较。使用三齿配体组,可以分离氯化镓络合物3和(±)-4和铝类似物5和(±)-6。烷氧基镓络合物(±)-2还制备并表征了由salen配体支撑的α-己内酰胺,并将其与三组分体系GaCl 3 / BnOH / NEt 3一起用于丙交酯和ε-己内酯的开环聚合反应。两种体系的聚合速率和选择性均显着低于铟类似物的聚合速率和选择性。(±)-2的反应与1当量的丙交酯一起形成第一插入产物,其在溶液中稳定并且可以在室温下表征。为了理解第13组金属络合物之间反应性的差异,对一系列铝,镓和铟卤化物络合物进行了路易斯酸度研究(使用三乙基