Syntheses and structures of products resulting from oxygen insertion and hydrolysis of Salan-Al compounds
摘要:
The combination of one and two equivalents of AlMe3 with the ligand, Salean(Bu-t)H-4 (N,N'-bis((3,5-di-tert-butyl)-2-hydroxybenzyl)-1,2-diamino ethane) leads to the compounds, Salean(Bu-t)H2AlMe (I), and Salean(Bu)HAlMe(AlMe2) (2). When 2 is exposed to air, [Salean(Bu-t)HAlOMe](2) (3) first forms, and then, after several days, [Salean(Bu-t)H2AlOH](2) (4). Compound 4 is the only product that occurs when 1 is exposed to air. All four compounds have been characterized by spectroscopic (IR,H-1 NMR, Al-27 NMR) and physical techniques (Mp, C,H analysis) and, in the case of 3 and 4, by X-ray crystallography. The structures consist of dimeric units with bridging OMe and OH groups. (C) 1999 Elsevier Science Ltd. All rights reserved.
Synthesis of Bimetallic Bis(phenolate) N-Heterocyclic Carbene Lanthanide Complexes and Their Applications in the Ring-Opening Polymerization of <scp>l</scp>-Lactide
作者:Min Zhang、Xufeng Ni、Zhiquan Shen
DOI:10.1021/om500930m
日期:2014.12.8
. All complexes were characterized by elemental analysis. Complex 1a, 2a,c, and 3a–c were characterized by X-ray crystallography, and complexes 2c,d were characterized by 1H and 13C NMR spectroscopy. The NHC complexes were efficient initiators for the ring-opening polymerization (ROP) of l-lactide (l-LA), with 2a giving the best catalytic activity. Imidazolinium-bridged lanthanide complexes 3a–c were
Oxygen atom transfer between DMSO and benzoin catalyzed by <i>cis</i>-dioxidomolybdenum(<scp>vi</scp>) complexes of tetradentate Mannich bases
作者:Mannar R. Maurya、Bekele Mengesha、Bhawna Uprety、Nancy Jangra、Reshu Tomar、Fernando Avecilla
DOI:10.1039/c7nj03551a
日期:——
Ophenolate and two Namine atoms in a cis-α type binding mode involving coordination with one of the Namine atoms in the apical position and one Ooxido terminaloxygenatom in the equatorial position. These complexes catalyze oxygenatom transfer between benzoin and dimethyl sulfoxide (DMSO) in acetonitrile at 80 °C. The formation of benzil could easily be monitored by HPLC. The electronic effect caused by the
乙二胺衍生的二齿四齿ONNO供体曼尼希碱与2,4-二叔丁基苯酚(H 2 L 1 I),2,4-二甲基苯酚(H 2 L 2 II),2-叔丁基的反应含[Mo VI O 2(acac)2 ](Hacac )的-4-甲基苯酚(H 2 L 3 III),2,4-二氯苯酚(H 2 L 4 IV)和2-萘酚(H 2 L 5 V)在回流的MeOH中以1:1的摩尔比加入=乙酰丙酮)得到相应的顺式-二氧化钼(VI)络合物[Mo VI O 2(L 1)] 1,[Mo VI O 2(L 2)] 2,[Mo VI O 2(L 3)] 3,[Mo VI O 2(L 4))] 4和[Mo VI O 2(L 5)] 5。所有配合物均通过元素分析,各种光谱(FT-IR,UV / Vis,1 H和13C NMR)技术和单晶X射线分析(的1,2,3和5)。这些络合物采用扭曲的六配位八面体几何形状,其中配体以四齿方式起作用,通
Synthesis and characterization of an iron(III) complex of an ethylenediamine derivative of an aminophenol ligand in relevance to catechol dioxygenase active site
作者:Elham Safaei、Narges Naghdi、Zvonko Jagličić、Andrej Pevec、Yong-Ill Lee
DOI:10.1016/j.poly.2016.10.034
日期:2017.1
high spin iron(III) complex. It shows weak antiferromagnetic interactions through N H⋯Cl intermolecular interactions. The ligand-centered electrochemical oxidation of this complex, due to the oxidation of phenolate group to phenoxyl radicals, as well as the electrochemical metal-centered reduction of the ferric ion to the ferrous ion were investigated. In addition, the efficient cleavage by oxygenation
Synthesis, characterization and catalytic activity of dioxidouranium(VI) complexes of ONNO tetradentate Mannich bases
作者:Mannar R. Maurya、Bekele Mengesha、Shailendra K. Maurya、Fernando Avecilla
DOI:10.1016/j.ica.2019.04.034
日期:2019.7
Abstract The reaction of dibasic tetradentate ONNO donor Mannichbases, derived from ethylenediamine and 2,4–di–tert–butylphenol (H2L1) (I), 2,4–di–methylphenol (H2L2) (II), 2–tert–butyl–4–methylphenol (H2L3) (III) and 2,4–di–chlorophenol (H2L4) (IV), with UVIO2(MeCOO)2·2H2O in a 1:1 M ratio in refluxing MeOH gave the corresponding mononuclear trans-dioxidouranium(VI) complexes of the type trans-[UVIO2L(MeOH)]
Biomimetic Oxidative Bromination by
<i>cis</i>
‐Dioxidotungsten(VI) Complexes of Salan Type N,N’‐Capped Linear Tetradentate Amino Bisphenol
作者:Mannar R. Maurya、Shailendra K. Maurya、Naveen Kumar、Puneet Gupta
DOI:10.1002/ejic.202100357
日期:2021.7.22
Reaction of [WVIO2(acac)2] (Hacac=acetylacetone) with salan-type dibasic tetradentate ONNO donor Mannich bases derivedfrom ethylenediamine, formaldehyde and 2,4-di-tert-butylphenol (H2L1), 2-tert-butyl-4-methylphenol (H2L2), 2,4-dimethylphenol (H2L3) and 2,4-dichlorophenol (H2L4) in a 1 : 1 ([WVIO2(acac)2] : H2L) molar ratio in refluxing MeOH gave the corresponding cis-dioxidotungsten(VI) complexes
[W VI O 2 (acac) 2 ](Hacac = 乙酰丙酮)与源自乙二胺、甲醛和 2,4-二叔丁基苯酚(H 2 L 1 ) 的萨兰型二元四齿 ONNO 供体曼尼希碱的反应,2 -叔丁基-4-甲基苯酚 (H 2 L 2 )、2,4-二甲基苯酚 (H 2 L 3 ) 和 2,4-二氯苯酚 (H 2 L 4 ) 以 1 : 1 ([W VI O 2 ( acac) 2 ] : H 2 L) 摩尔比在回流的 MeOH 中得到相应的顺式-二氧化钨(VI)配合物[W VI O 2 L 1 ] ( 1 ), [W VI O 2 L 2 ] ( 2 ), [W VI O 2 L 3 ] ( 3 )和[W VI O 2 L 4 ] ( 4 ) 分别。元素分析表征、各种光谱(FT-IR、UV-vis、1 H 和13 C NMR)研究、DFT 计算和2和3的单晶 X 射线分析表明六配位八面体 α-顺式配