Abstract Pincer‐based catalysts possess an exceptional balance of stability versus reactivity, aspects fundamental interest in catalyst design. This has been well‐controlled by systematic ligand modifications along with the variation metal center. Ruthenium pincer complexes (RPCs), exhibit a versatile chemistry, serve as excellent precursors and find potential applications many organic transformations. A large number novel valuable reactions developed using both stoichiometric catalytic...

Dative bonds between p- and d-block atoms are common but species containing a double dative bond, which donate two-electron pairs to the same acceptor, far less common. The synthesis of complexes UCl4 carbodiphosphoranes (CDP), formally possess Cl4U⇇CDP, is reported in this paper. Single-crystal X-ray diffraction shows that uranium-carbon distances range bond lengths for bonds. A bonding analysis suggests molecules uranium-carbone featuring divalent carbon(0) ligands rather than...

The three-dimensional inorganic analogues of 9,10-diboraanthracene, B2X2(C2B10H10)2 (X = Cl, 1; X Br, 2), were attained by salt elimination Li2C2B10H10 and trihaloboranes. methyl- phenyl-substituted compounds B2Me2(C2B10H10)2 (3) B2Ph2(C2B10H10)2 (4) obtained treating 1 or 2 with the corresponding Grignard reagents. These fully characterized NMR, cyclic voltammetry (CV), IR, single-crystal X-ray diffraction analyses. Experimental (CV Gutmann–Beckett method) computational (fluoride ion...

Abstract Periodontal homeostasis is maintained by the dynamic equilibrium between cell death, differentiation and proliferation of resident cells in periodontal microenvironment. Loss ligament fibroblasts (PDLFs) has been a major challenge treatment. This study aimed to investigate exact role necroptotic death diseases. Elevated levels receptor-interacting protein serine-threonine kinases -1 (RIPK1), phosphorylated RIPK3, mixed lineage kinase domain-like (MLKL), MLKL FLIP L were observed...

An efficient and phosphine-free bidentate NHC/Ru catalytic system was discovered for the dehydrogenative amide synthesis from alcohols amines.

A set of complexes containing dative interactions between a rare-earth metal and carbon are reported. Complex 2, Br3Ce(CDP)(THF), with Ce←C bond was synthesized by the reaction CeBr3 carbon(0) ligand, carbodiphosphorane (CDP). More significantly, trivalent cerium complex 3, [BrCe(CDP)2](BPh4)2, two σ C→Ce←C also isolated, which represents an unusual example formed same atom in molecule. Furthermore, π donation second lone-pair electrons CDP ligand is rather weak. Single-crystal X-ray...

Rare-earth metal cations have been used rarely as Lewis-acidic components in the chemistry of frustrated Lewis pairs (FLPs). Herein, we report first cerium/phosphorus system (2) employing a heptadentate N4 P3 ligand, which exhibits triple FLP-type reactivity towards series organic substrates, including isocyanates, isothiocyanates, diazomethane, and azides on single rare-earth acidic Ce center. This result shows that center three P atoms 2 could simultaneously activate equivalents small...

Pincer-type ruthenium complexes incorporating an asymmetric negatively charged imidazolylidene were prepared and capable to oxidize water chemically photo-chemically with high stability.

BN/CC isosterism has been widely investigated as a strategy to expand carbon-based compounds. The introduction of BN units in organic molecules always results novel properties. In this work, we reported the first synthesis and characterization 1,6;2,3-bis-BN cyclohexane, an isostere cyclohexane with two adjacent pairs. Its ring flipping barrier is similar that cyclohexane. Protic hydrogens on N show higher reactivity than its isomeric bis-BN This compound exhibits appealing hydrogen storage...

The π-expanded dibenzocyclooctatetraene ligand was employed to access an unprecedented series of actinide sandwich compounds. trivalent uranium complexes were studied by crystallography, spectroscopy, and computations.

Nonstationary elastohydrodynamic lubrication (EHL) of an involute spur gear is a very complex problem. A full transient EHL solution obtained by utilizing the multigrid method, which takes variation in equivalent curvature, entrainment velocity, and load with time along line action into consideration. The lubricant thermal rheological effects are ignored teeth assumed to be rigid model as far tooth flexure concerned. influences spectrum impact on analyzed this article. Over meshing cycle...

Low-valent uranium-element multiple bond complexes remain scarce, though there is burgeoning interest regarding to their bonding and reactivity. Herein, isolation of a uranium(III)-carbon double complex [(Cp*)2 U(CDP)](BPh4 ) (1) comprising tridentate carbodiphosphorane (CDP) was reported for the first time. Oxidation 1 afforded corresponding U(IV) )2 (2). The distance between U C in 2 2.481 Å, indicating existence typical U=C bond, which further confirmed by quantum chemical calculations....

Open AccessCCS ChemistryCOMMUNICATION6 Jun 2022Complex Featuring Two Double Dative Bonds Between Carbon(0) and Uranium Wei Fang, Sudip Pan, Su, Shuao Wang, Lili Zhao, Gernot Frenking Congqing Zhu Fang State Key Laboratory of Coordination Chemistry, Jiangsu Advanced Organic Materials, School Chemistry Chemical Engineering, Nanjing University, 210023 , Pan Institute Synthesis, Molecular National Synergetic Innovation Center for Tech 211816 Fachbereich Chemie, Philipps-Universität Marburg,...

Abstract Two complexes with double‐ or triple‐stranded chain structures, {[Cd(pg)(phen)] · 3H 2 O} n ( 1 ) and {[Cd 3 (cpg) (phen) ] ), have been hydrothermally synthesized [H pg = 3‐phenylglutaric acid, H cpg 3‐(4‐chlorophenyl)glutaric phen 1,10‐phenanthroline]. In the crystal lattices of , two 1D polymeric water morphologies are observed (a treelike for a staircaselike tape both which contain (H O) 6 subunits. The geometrical parameters chains tapes similar to those in ice, I h liquid...

Abstract The atom‐economic direct amidation of alcohols with amines has been recently highlighted as an attractive and promising transformation. Among the versatile reported catalytic systems, in situ generated N‐heterocyclic carbene (NHC)/ruthenium (Ru) systems have demonstrated their advantages such easy operation use commercial Ru compounds. However, existing catalyst loadings are relatively high, additional insights for generation still not well‐documented. In this work, a variety...

Abstract In this work, the effects of substitutions in backbone imidazolylidene and axial ligands on reactivity stability water‐oxidation catalysts were investigated. Three pincer‐type asymmetric imidazolium salts NC NHC O , NHC‐4Br NHC‐B (NHC: N‐heterocyclic carbene), which donating ability corresponding decreases same sequence, prepared. Their application metalation afforded Ru complexes 1 a b 2 3 . It was found that incorporating stronger donor displayed lower potential for each redox...

We demonstrate herein the ZIF-8-only-mediated catalysis of cyclodimerization epichlorohydrin to 2,5-bis(chloromethyl)-1,4-dioxane in absence co-catalyst and solvent. The easy handling economic aspects ZIF-8, addition one-step reaction produce cyclodimer, make this catalyst attractive even for industry. It has been clearly illustrated that nature method used synthesize ZIF-8 affected yields cyclodimers. Specifically, employed directly influences amount crystal structural defects, which turn...

Frustrated Lewis pairs (FLPs) represent a new paradigm of main-group chemistry. The acidic centers in FLP chemistry are typically B and Al atoms the studies reported over past decade, most them tri-coordinated with strong electron-withdrawing groups. Herein, Ga/P system is which contains an unprecedented four-coordinated Ga center. This species performs classical addition reactions toward heterocumulenes, alkyne, diazomethane, transition metal complex. Regioselective formation products can...

The role of charged axial ligands in tuning the reactivity and stability Ru WOCs is well-known, less explored when are neutral molecules.

Orientierungssinn: Eine charakteristische geordnete Domäne eines 2:1-Sandwichkomplexes aus Phthalocyaninen und Tetraphenylporphyrin wurde durch STM in situ auf einer Au(111)-Oberfläche nachgewiesen. Demnach entstand die hochgeordnete Struktur dadurch, dass sich Moleküle abwechselnd zwei verschiedenen Orientierungen anordneten.

Since the beginning of twenty-first century, there has been widespread construction submarine oil-gas transmission pipelines due to an increase in offshore oil exploration. Vessel anchoring operations are causing more damage shipping transportation also increasing. Therefore, it is essential that influence on required burial depth determined. In this paper, mathematical models for ordinary and emergency have established derive anchor impact energy equation each condition. The effective then...

In this contribution, we illustrate uranium complexes bearing a pendant borate (i.e. 1 and 2) or borane 3 4) moiety via reaction of the highly strained uranacycle I with various 3-coordinate boranes. Complexes 4 represent first examples Lewis acid. Moreover, complex was capable activation CO, delivering new CO mode, an abnormal 1,2-insertion pathway into U-N bond. The importance confirmed by controlled experiments.