A Phosphine-Free Manganese Catalyst Enables Stereoselective Synthesis of (1 + <i>n</i>)-Membered Cycloalkanes from Methyl Ketones and 1,<i>n</i>-Diols
作者:Akash Jana、Kuhali Das、Abhishek Kundu、Pradip Ramdas Thorve、Debashis Adhikari、Biplab Maji
DOI:10.1021/acscatal.9b05567
日期:2020.2.21
Herein, we report the stereoselective synthesis of (1 + n)-membered cycloalkane from methyl ketone and 1,n-diol. A manganese(I) complex bearing a phosphine-free ligand catalyzed the reaction, which involved the formation of two C–C bonds via a sequence of intermolecular- and intramolecular-borrowing hydrogenation reactions. It produces 2 mol of water as the sole byproduct, making the process atom economical
Chromotropism in halo-bridged dimers. Structural characterization of bis(μ-halo)bis(halo N-(pyridin-2-ylmethyl)cyclohexanamine copper(II))
作者:Hamid Golchoubian、Samira Nateghi
DOI:10.1080/00958972.2016.1227972
日期:2016.11.1
position of the copper(II) being occupied by the bridging chloride anion which is equatorial to the other copper ion, forming a dimeric copper(II) complex. The chromotropic properties of both complexes, including solvato-, thermo-, and halochromism, were investigated. The complexes show reversible thermochromism in solution which is irreversible in the solid state. It was found that the solvatochromism is
摘要 两种双核铜 (II) 配合物 [LCu(μ-Cl)Cl]2 (DMF) (1) 和 [LCu(μ-Br)Br]2 (2),具有双齿配体 N-(pyridin-2)合成了-基甲基)环己胺,L,并通过物理化学和光谱(IR,UV-vis)数据进行表征。1 的晶体结构分析表明,两个铜 (II) 离子都处于扭曲的四角锥 N2Cl3 环境中,铜 (II) 的顶端位置被与另一个铜离子赤道的桥接氯阴离子占据,形成一个二聚铜(II)配合物。研究了这两种配合物的变色特性,包括溶剂化、热和卤化变色。该配合物在溶液中表现出可逆的热致变色现象,而在固态时则不可逆。发现溶剂化显色是由于结构变化以及配合物空位的溶剂化所致。通过可见吸收光谱在 1-11 的 pH 范围内研究了它们的卤致变色特性。颜色从蓝色变为绿色并变为无色是由于配体的去质子化和质子化。
Anchored Palladium Complex‐Generated Clusters on Zirconia: Efficiency in Reductive
<i>N</i>
‐Alkylation of Amines with Carbonyl Compounds under Hydrogen Atmosphere
generation method of palladium clusters and catalytic reductive N-alkylation of amines with carbonyl compounds are reported. The active Pd species are formed by treatment of highly dispersed molecular palladiumcomplexes with atmospheric hydrogen, and the present catalyst system shows a broad substrate scope and functional group tolerance with respect to both amines and carbonyl compounds.
from a rhodium center to imine substrates in a biomimetic way. Under both transfer hydrogenation and reductiveamination reaction conditions, the catalyst exhibited good selectivity towards CN bonds. With the catalyst, 34 imines were transfer hydrogenated to corresponding amines and a key intermediate of retigabine was prepared via reductiveamination in a greener way. According to the NMR observations
将基于金属和键合辅因子模拟物之间合作的策略应用于 CN 键的转移氢化。我们设计并合成了一种含有 1,3-二甲基苯并咪唑部分的铑配合物,它可以以仿生的方式将氢化物从铑中心转移到亚胺底物上。在转移氢化和还原胺化反应条件下,催化剂对C N 键表现出良好的选择性。使用该催化剂,34个亚胺被转移氢化成相应的胺,并通过还原胺化以更绿色的方式制备了瑞替加滨的关键中间体。根据核磁共振观察和同位素实验,提出了这种仿生还原碳氮键的合理机制。
Synthesis and characterization of aminopyridine iron(<scp>ii</scp>) chloride catalysts for isoprene polymerization: sterically controlled monomer enchainment
作者:Chuyang Jing、Liang Wang、Qaiser Mahmood、Mengmeng Zhao、Guangqian Zhu、Xianhui Zhang、Xiaowu Wang、Qinggang Wang
DOI:10.1039/c9dt00452a
日期:——
analysis: Fe3Me and Fe11Me adopted distorted tetrahedral geometries in the solid state while Fe4H and Fe7H were found in dimeric or polymeric forms respectively in which chlorides acted as bridging ligands. The catalytic capacities of these iron complexes were investigated for isoprene polymerization. Upon activation with a MAO cocatalyst, the catalytic activities of complexes varied as a function of the steric
在这项研究中,一系列的2-R-6-(1-(烷基氨基)甲基)吡啶-铁络合物[烷基:(CPh 3)Fe1 H ; (CHPh 2)Fe2 H ; (CHPh 2)Fe3 Me ; (CHMePh)FE4 ħ ; (CH 2 Ph)Fe5 H ; (CHMe 2)Fe6 H ; (C 6 H 11)Fe7 H ; (CH 2(4-OMe)Ph)Fe8 H ; (CH 2(4-CF 3)Ph)Fe9 H ; (CH2(2,4,6-Me 3)Ph) Fe10 H ; 合成了(CH 2 Ph) Fe11 Me ],并通过ATR-IR光谱,HRMS光谱和元素分析对其进行了很好的表征。此外,的Fe3我, FE4 ħ, Fe7 ħ和FE11我用X射线衍射分析:的Fe3我和FE11我通过了在固态扭曲四面体几何形状而FE4 ħ和Fe7 ħ分别以二聚或聚合形式发现氯,其中氯化物充当桥连配体。研究了这些铁络合物对异