26930-67-6Relevant academic research and scientific papers
Synthesis, structures, and spectroscopic properties of Hg(II) complexes of bidentate NN and tridentate NNO Schiff-base ligands
Basu Baul, Tushar S.,Kundu, Sajal,Hoepfl, Herbert,Tiekink, Edward R.T.,Linden, Anthony
, p. 1061 - 1078 (2014)
Reactions of HgX2 (X = Cl, N3, NO3) with (E)-2-methoxy-N-(pyridin-2-ylmethylene)aniline (L1) and (E)-4-methoxy-N-(pyridin-2-ylmethylene)aniline (L2) in ethanol gave two monomers, [HgL1(Cl)
Dynamic aminal-based TPA ligands
Zhou, Yuntao,Yuan, Yaofeng,You, Lei,Anslyn, Eric V.
, p. 8207 - 8213 (2015)
The use of dynamic covalent reactions (DCRs) is gaining popularity for the construction of self-assembling architectures. We have recently introduced DCRs that exchange alcohols and aldehydes to create hemiaminal ethers within tri(2-picolyl)amine (TPA) li
Synthesis, crystal structure, spectroscopic and nonlinear optical properties of organic salt: A combined experimental and theoretical study
Faizi, Md. Serajul Haque,Osório, Francisco A. P.,Valverde, Clodoaldo
, (2020)
The 2-methoxy-pyrido[1,2-a]quinoxalin-11-ylium bromide (2MPQYB) crystal was characterized from single crystal X-ray diffraction (SCXRD) and spectroscopy analysis. The fluorescence spectrum of the compound showed one broad peak at 473 nm. The supramolecular arrangement in solid state was confirmed by 2D-fingerprint plots and Hirshfeld surface analysis. An additional topological analysis from quantum theory of atoms in molecules (QTAIM) highlights the observed halogen bonds on solid state for 2MPQYB. Also the supermolecule (SM) approach was used to simulate the crystalline environment with 246,064 atoms and an ab-initio calculation method, which includes the Density Functional Theory (DFT) at CAM-B3LYP/6–311++G(d,p) level, was used to estimate the crystal linear refractive index and the third-order nonlinear susceptibility at the frequency of ω=0.086a.u. (λ = 532 nm) and the obtained values were 1.85 and χ3=621.14×10?22m2/V2 respectively. This χ3-value is up to 312.13 times greater than obtained for others organic crystals of the literature, thus indicating that the 2MPQYB can be considered for various applications of NLO materials.
Effect of the N-based ligands in copper complexes for depolymerisation of lignin
Dai, Jinhuo,Nanayakkara, Sepa,Lamb, Thomas C.,Clark, Andrew J.,Guo, Si-Xuan,Zhang, Jie,Patti, Antonio F.,Saito, Kei
, p. 3511 - 3519 (2016)
Several organic soluble N-based ligands and their copper complexes were firstly investigated as catalysts to depolymerise organosolv lignin in the organic solvent, dimethylformamide (DMF) and an ionic liquid (1-ethyl-3-methylimidazolium xylenesulfonate, [
Stepwise and one-pot syntheses of Ir(iii) complexes with imidazolium-based carbene ligands
Chien, Chih-Hsien,Fujita, Singo,Yamoto, Suguru,Hara, Takeshi,Yamagata, Tsuneaki,Watanabe, Masami,Mashima, Kazushi
, p. 916 - 923 (2008)
We report the preparation, crystal structure, electrochemistry, and emission properties of Ir(CC:)3, where CC: is an N-heterocyclic carbene ligand. Two synthetic approaches are introduced for generating Ir(iii) complexes bearing imidazolium-bas
A facile one-pot synthesis of 2-(2-pyridyl)quinolines via Povarov reaction
Borel, Carmindo Ribeiro,Barbosa, Luiz Claudio Almeida,Maltha, Célia Regina álvares,Fernandes, Sergio Antonio
, p. 662 - 665 (2015)
An efficient synthesis of 2-(2-pyridyl)quinolines was achieved via a three-component Povarov reaction of aromatic aldehydes, anilines, and ethyl vinyl ether under boron trifluoride methyl etherate (BF3·O(CH3)2) acid catalysis. The developed methodology for the preparation of 2-(2-pyridyl)quinolines offers several advantages over previous methods including mild reaction conditions, easy work-up, a wide range of substrate applicability, and products in good yields.
N,N-Chelate nickel(II) complexes bearing Schiff base ligands as efficient hydrogenation catalysts for amine synthesis
Xu, Mengyin,Wang, Yang,Zhou, Yifeng,Yao, Zi-Jian
, (2021/12/09)
Five N, N-chelate nickel (II) complexes bearing N-(2-pyridinylmethylene)-benzylamine ligands with different substituent groups were synthesized in good yields. The nickel complexes exhibited prominent catalytic efficiency toward amine synthesis from nitro compounds by using NaBH4 or H2 as hydrogen source through two catalytic systems. Various amines with different substituents were obtained in moderate to excellent yields. All substrates with electron-donating and electron-withdrawing properties were tolerated in the two reduction systems. Given the efficient catalytic activity, broad substance scope, and mild reduction conditions, the nickel catalysts have potential applications in industrial production.
Iron-Catalyzed Hydrogen Transfer Reduction of Nitroarenes with Alcohols: Synthesis of Imines and Aza Heterocycles
Wu, Jiajun,Darcel, Christophe
, p. 1023 - 1036 (2021/01/09)
A straightforward and selective reduction of nitroarenes with various alcohols was efficiently developed using an iron catalyst via a hydrogen transfer methodology. This protocol led specifically to imines in 30-91% yields, with a good functional group tolerance. Noticeably, starting from o-nitroaniline derivatives, in the presence of alcohols, benzimidazoles can be obtained in 64-72% yields when the reaction was performed with an additional oxidant, DDQ, and quinoxalines were prepared from 1,2-diols in 28-96% yields. This methodology, unprecedented at iron for imines, also provides a sustainable alternative for the preparation of quinoxalines and benzimidazoles.
Improving C=N bond reductions with (Cyclopentadienone)iron complexes: Scope and limitations
Cettolin, Mattia,Bai, Xishan,Lübken, Dennis,Gatti, Marco,Facchini, Sofia Vailati,Piarulli, Umberto,Pignataro, Luca,Gennari, Cesare
supporting information, p. 647 - 654 (2018/10/24)
Herein, we broaden the application scope of (cyclo-pentadienone)iron complexes 1 in C=N bond reduction. The catalytic scope of pre-catalyst 1b, which is more active than the “Kn?lker complex” (1a) and other members of its family, has been expanded to the catalytic transfer hydrogenation (CTH) of a wider range of aldimines and ketimines, either pre-isolated or generated in situ. The kinetics of 1b-promoted CTH of ketimine S1 were assessed, showing a pseudo-first order profile, with TOF = 6.07 h–1 at 50 % conversion. Moreover, the chiral complex 1c and its analog 1d were employed in the enantioselective reduction of ketimines and reductive amination of ketones, giving fair to good yields and moderate enantioselectivity.
Zinc (II), palladium (II) and cadmium (II) complexes containing 4-methoxy-N-(pyridin-2-ylmethylene) aniline derivatives: Synthesis, characterization and methyl methacrylate polymerization
Park, Suhyun,Lee, Jungkyu K.,Lee, Hyosun,Nayab, Saira,Shin, Jong Won
, (2019/02/16)
A series of Zn (II), Pd (II) and Cd (II) complexes, [(L)nMX2]m (L = L-a–L-c; M = Zn, Pd; X = Cl; M = Cd; X = Br; n, m = 1 or 2), containing 4-methoxy-N-(pyridin-2-ylmethylene) aniline (L-a), 4-methoxy-N-(pyridin-2-ylmethyl) aniline (L-b) and 4-methoxy-N-methyl-N-(pyridin-2-ylmethyl) aniline (L-c) have been synthesized and characterized. The X-ray crystal structures of Pd (II) complexes [L1PdCl2] (L = L-b and L-c) revealed distorted square planar geometries obtained via coordinative interaction of the nitrogen atoms of pyridine and amine moieties and two chloro ligands. The geometry around Zn (II) center in [(L-a)ZnCl2] and [(L-c)ZnCl2] can be best described as distorted tetrahedral, whereas [(L-b)2ZnCl2] and [(L-b)2CdBr2] achieved 6-coordinated octahedral geometries around Zn and Cd centers through 2-equivalent ligands, respectively. In addition, a dimeric [(L-c)Cd(μ-Br)Br]2 complex exhibited typical 5-coordinated trigonal bipyramidal geometry around Cd center. The polymerization of methyl methacrylate in the presence of modified methylaluminoxane was evaluated by all the synthesized complexes at 60°C. Among these complexes, [(L-b)PdCl2] showed the highest catalytic activity [3.80 × 104 g poly (methyl methacrylate) (PMMA)/mol Pd hr?1], yielding high molecular weight (9.12 × 105 g mol?1) PMMA. Syndio-enriched PMMA (characterized using 1H-NMR spectroscopy) of about 0.68 was obtained with Tg in the range 120–128°C. Unlike imine and amine moieties, the introduction of N-methyl moiety has an adverse effect on the catalytic activity, but the syndiotacticity remained unaffected.
