Direct intramolecular carbon(sp<sup>2</sup>)–nitrogen(sp<sup>2</sup>) reductive elimination from gold(<scp>iii</scp>)
作者:Jong Hyun Kim、R. Tyler Mertens、Amal Agarwal、Sean Parkin、Gilles Berger、Samuel G. Awuah
DOI:10.1039/c8dt05155k
日期:——
carbon donor ligands results in reductiveelimination. Combined experimental and computational investigations lead to the first evidence of a direct intramolecular C(sp2)–N(sp2) bond formation from a monomeric [(C^N)AuCl2] gold(III) complex. We show that bidentate ligated Au(III) systems bypass transmetallation to form C(sp2)–N(sp2) species and NHC–Au–Cl. Mechanistic investigations of the reported transformation
α-Diimines as Versatile, Derivatizable Ligands in Ruthenium(II) <i>p</i>-Cymene Anticancer Complexes
作者:Lorenzo Biancalana、Lucinda K. Batchelor、Tiziana Funaioli、Stefano Zacchini、Marco Bortoluzzi、Guido Pampaloni、Paul J. Dyson、Fabio Marchetti
DOI:10.1021/acs.inorgchem.8b00882
日期:2018.6.4
α-Diimines are among the most robust and versatile ligands available in synthetic coordination chemistry, possessing finely tunable steric and electronic properties. A series of novel cationic ruthenium(II) p-cymene complexes bearing simple α-diimine ligands, [(η6-p-cymene)RuClκ2N-(HCNR)2}]NO3 (R = Cy, [1]NO3; R = 4-C6H10OH, [2]NO3; R = 4-C6H4OH, [3]NO3), were prepared in near-quantitative yields
α-二亚胺是合成配位化学中可用的最强大和最通用的配体之一,具有可微调的空间和电子特性。一系列新的阳离子钌(II)p -cymene络合物轴承简单α二亚胺配体,[(η 6 - p -cymene)的RuCl κ 2 Ñ - (HCNR)2 }] NO 3(R = CY,[ 1 ] NO 3; R = 4-C 6 H 10 OH,[ 2 ] NO 3; R = 4-C 6 H 4 OH,[ 3 ] NO 3)以接近定量的形式制备为它们的硝酸盐。[ 2 ] NO 3显示出高水溶性。通过与羟基的酯化反应,研究了[ 3 ] NO 3中α-二亚胺配体作为生物活性分子载体的潜力。因此,双官能化的衍生物[(η 6 - p -cymene)的RuCl κ 2 Ñ - (HCN(4-C 6 H ^ 4 OCO-R))2 }] NO 3(R =阿司匹林,[ 5 ] NO 3 ;丙戊酸盐,[ 6 ] NO 3),还有[
Hydroformylation of olefins using redox-active rhodium(I) alpha-diimine-cored aryl ether metallodendrimers
作者:Nikechukwu N. Omosun、Siyabonga Ngubane、Gregory S. Smith
DOI:10.1016/j.apcata.2020.117950
日期:2021.1
ether)-based, core-functionalised alpha-diimine metallodendrimers were investigated as catalyst precursors in the rhodium-catalysed hydroformylation of terminal olefins, 1-octene and styrene. The electronic environment across the metallodendrimer series was probed using cyclic voltammetry. The electrochemical behaviour of the metallodendrimers show irreversible and quasi-reversible electrochemical behaviour
研究了铑(I)聚(芳基醚)-基团,核官能化的α-二亚胺金属树枝状大分子作为铑在末端烯烃,1-辛烯和苯乙烯的加氢甲酰化反应中的催化剂前体。使用循环伏安法检测了整个金属树枝状大分子系列的电子环境。金属树枝状大分子的电化学行为在100 mV s -1的扫描速率下在0.0-2.0 V的范围内显示出不可逆和准可逆的电化学行为。在所研究的条件下,所有催化剂前体(C1 - C6)均具有良好的化学选择性,从而使各个底物具有优异的转化率。通常,较高级的树枝状催化剂C5和C6 具有更好的区域选择性,有利于线性醛。
Water‐Soluble, Disulfonated alpha‐Diimine Rhodium(I) Complexes: Synthesis, Characterisation and Application as Catalyst Precursors in the Hydroformylation of 1‐Octene
作者:Nikechukwu N. Omosun、Gregory S. Smith
DOI:10.1002/ejic.201900317
日期:2019.6.2
The synthesis and characterisation of two new water‐soluble RhI mononuclear 1,4‐diazabutadiene (DADs) complexes of general formula: [Rh(DADs‐R)(COD)], where (DADs = sulfonated‐tagged–1,4‐diazabutadiene, COD = cyclooctadiene; and R = H or C10H8), are described. The rhodium(I) complexes were obtained via a complexation reaction of [Rh(COD)(MeCN)2]BF4 with the sulfonated α‐diimine (DAD) ligands, which
两种新的水溶性Rh I单核1,4-二氮杂丁二烯(DAD s)配合物的合成和表征:[Rh(DAD s- R)(COD)],其中(DAD s =磺化标记的-1描述了4-重氮杂丁二烯,COD =环辛二烯; R = H或C 10 H 8)。铑(I)配合物是通过[Rh(COD)(MeCN)2 ] BF 4与磺化的α-二亚胺(DAD)配体的络合反应获得的,该配体先前是通过4-氨基苯酚的席夫碱缩合反应获得的与1,2-乙二酮或cen庚啶对苯二酚一起使用。所有铑配合物及其前体配体均使用1表征1 H NMR,13 C NMR,FT-IR光谱和质谱。评估了它们在1-辛烯加氢甲酰化中作为催化剂前体的性能,并将其与未磺化的Rh I单核1,4-二氮杂丁二烯(DAD)配合物进行了比较。水溶性[Rh(DAD s -R)(COD)]的使用可导致1-辛烯双相加氢甲酰化水溶液中的高转化率和区域选择性(线性/支化醛比)。另外,通
A Simple and Convenient Synthesis of Pyrazinones
作者:Saikat Das Sharma、Pranjal Gogoi、Dilip Konwar
DOI:10.1080/00397910600978499
日期:2007.1.1
Abstract Pyrazinones were synthesized by reacting mesoionic azlactone [2‐aryl‐4‐methyl‐Δ2‐oxaxolin‐5‐one] and 1,4‐diazabutadienes in good yields at room temperature.