- The effect of ligand design on the structural and photophysical properties of Nd(III) complexes with Schiff bases of the [(phenylimino)methyl]phenol-type
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Three mononuclear Nd(III) complexes [Nd(HL1)2(NO3)3] (1, HL1=2-methoxy-6-[(E)-(phenylimino)methyl]phenol), [Nd(HL2)3(NO3)3] (2, HL2=5-methoxy-2-[
- Pikoli, Sibongile,Hosten, Eric,Abrahams, Abubak’r
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- Palladium (II) complexes based on Schiff base ligands derived from ortho-vanillin; synthesis, characterization and cytotoxic studies
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6-Methoxy-2-[(E)-Aryliminomethyl]-phenol (Aryl = Phenyl; 2,6-dimethyl; 2,6-diisopropylphenyl; 2,6-dichlorophenyl), comprising L1–L4 ligands, and palladium complexes [Pd(Ln)2, n = 1–4] have been synthesized. The
- Faghih, Zeinab,Neshat, Abdollah,Wojtczak, Andrzej,Faghih, Zahra,Mohammadi, Zahra,Varestan, Solmaz
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- Vibrational analysis and physical property studies of 6-Methoxy-2-[(E)-phenyliminomethyl]-phenol in the THz, IR and UV–visible spectral regions
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Bulk single crystals of 6-Methoxy-2-[(E)-phenyliminomethyl]phenol were grown after preparing the material by Schiff base condensation of ortho-vanillin alternatively called 2-hydroxy-3-methoxybenzaldehyde and aniline. The three dimensional molecular and c
- K.M., Hijas,S. Madan, Kumar,B.C., Manjunath,R., Nagalakshmi
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- Catalytic investigation of Pd(II) complexes over Heck–Mizoroki reaction: Tailored synthesis, characterization and density functional theory
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Tailored reaction of Schiff base ligands with palladium(II) chloride and imidazole afford three complexes of formula [Pd(II)(L)(imdz)2]Cl, which are L = 2-((E)-(p-lylimino)methyl)-6-methoxyphenol (complex 1), 2-methoxy-6-((E)-(phenylimine)methyl)phenol (complex 2) and 2-((E)-(4-chlorophenyl-imino)methyl)-6-methoxyphenol (complex 3). Compounds were characterized with elemental analysis, molar conductance, electronic spectroscopy, ESI-MS, FT-IR, TGA, 1H-NMR and 13C-NMR. Molecular structure and different quantum chemical parameters were calculated using the B3LYP basis set of density functional theory with the standard 6-311+G (d, 2p) level. The catalytic potential of 1-3 was examined over Heck-Mizoroki reaction and found in order of 1 > 2 > 3.
- Shukla, Satyendra N.,Gaur, Pratiksha,Bagri, Sanjay S.,Mehrotra, Ripul,Chaurasia, Bhaskar
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p. 269 - 282
(2021/05/06)
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- The Direct Synthesis of Imines, Benzimidazoles and Quinoxalines from Nitroarenes and Carbonyl Compounds by Selective Nitroarene Hydrogenation Employing a Reusable Iron Catalyst
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The “replacement” of noble metals by earth abundant metals is a desirable aim in catalysis and a possible way of conserving rare elements. The “replacement” is especially attractive if novel selectivity patterns are observed permitting the development of novel coupling reactions. Herein, we report on a novel, robust and reusable iron catalyst, which permits the selective hydrogenation of nitroarenes in the presence of hydrogenation-sensitive functional groups. Based on the selectivity pattern observed, the direct iron-catalyzed synthesis of imines and benzimidazoles from nitroarenes and aldehydes becomes feasible. In addition, we introduce the direct synthesis of quinoxalines from nitroarenes and diketones applying our catalyst.
- B?umler, Christoph,Kempe, Rhett
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supporting information
p. 8989 - 8993
(2018/05/30)
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- Synthesis, Characterization and Fluorescence Properties of Zn(II) and Cu(II) Complexes: DNA Binding Study of Zn(II) Complex
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Zinc(II) and copper(II) complexes containing Schiff base, 2- methoxy-6((E)-(phenylimino) methyl) phenol ligand (HL) were synthesized and characterized by elemental analysis, IR, NMR, and single crystal X-ray diffraction technique. The fluorescence propert
- Lavaee, Parirokh,Eshtiagh-Hosseini, Hossein,Housaindokht, Mohammad Reza,Mague, Joel T.,Esmaeili, Abbas Ali,Abnous, Khalil
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p. 333 - 344
(2016/01/15)
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- A Reusable Co Catalyst for the Selective Hydrogenation of Functionalized Nitroarenes and the Direct Synthesis of Imines and Benzimidazoles from Nitroarenes and Aldehydes
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The use of abundantly available transition metals in reactions that have been preferentially mediated by rare noble metals, for example, hydrogenations, is a desirable aim in catalysis and an attractive strategy for element conservation. The observation of novel selectivity patterns with such inexpensive metal catalysts is especially appealing. Herein, we report a novel, robust, and reusable cobalt catalyst that permits the selective hydrogenation of nitroarenes in the presence of highly hydrogenation-sensitive functional groups, as well as the direct synthesis of imines from nitroarenes and aldehydes or ketones in the presence of such substituents. Furthermore, we introduce the first base-metal-mediated direct synthesis of benzimidazoles from nitroarenes and aldehydes. Functional groups that are easy to hydrogenate are again well tolerated.
- Schwob, Tobias,Kempe, Rhett
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supporting information
p. 15175 - 15179
(2016/11/25)
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- Synthesis and characterization of 3d and 4f metal complexes of Schiff base ligands
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Square planar complexes of monomeric [Cu(L1)2] (1) and [Ni(L1)2] (2) (where L1 is C20H24NO 2) are isolated through the use of Schiff base ligands and characterized by X-ray diffraction, UV-Vis, electr
- Upadhyay, Apoorva,Vaidya, Shefali,Venkatasai, Vakacharla S.,Jayapal, Prabha,Srivastava, Anant K.,Shanmugam, Muralidharan,Shanmugam, Maheswaran
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- Zinc(II) and mercury(II) complexes with Schiff bases: Syntheses, spectral, and structural characterization
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Schiff bases o-vanilidene-1-aminobenzene (HL1) and o-vanilidene-2-methyl-1-aminobenzene (HL2) lead to the formation of mono-and bis-[(Cl)Zn(L1)] (1), [(Cl)Zn(L2)] (2), [(Cl)Hg(L1)] (3), [(Cl)Hg(L
- Dubey,Baranwal,Jha
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experimental part
p. 2645 - 2656
(2012/08/27)
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- Sulfonic acid supported on hydroxyapatite-encapsulated-γ-Fe 2O3 nanocrystallites as a magnetically separable catalyst for one-pot reductive amination of carbonyl compounds
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A novel, environmentally friendly procedure has been developed for the preparation of secondary or tertiary amines by one-pot reductive amination of carbonyl compounds using sodium borohydride in the presence of a magnetically recoverable sulfonic acid supported on hydroxyapatite-encapsulated-γ- Fe2O3 [γ-Fe2O3@HAP-SO 3H] at room temperature. The catalyst was easily separated from the reaction mixture by applying an external magnet and reused for six cycles without significant loss of catalytic activity.
- Deng, Jia,Mo, Li-Ping,Zhao, Fei-Yang,Hou, Lan-Lan,Yang, Li,Zhang, Zhan-Hui
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experimental part
p. 2576 - 2584
(2011/10/18)
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- Catalytic asymmetric inverse-electron-demand (IED) [4+2] cycloaddition of salicylaldimines: Preparation of optically active 4-aminobenzopyran derivatives
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The catalytic asymmetric inverse-electron-demand (IED) [4+2] cycloaddition of various salicylaldehyde-derived N-arylimines with electron-rich alkenes in the presence of chiral BINOL-derived phosphoric acid catalysts has been studied with the aim of obtaining optically active 4-aminobenzopyran derivatives. Dienophiles such as 2,3-dihydro-2H-furan, benzyl N-vinylcarbamate and 2-vinylindole have been employed. Copyright
- Bernardi, Luca,Comes-Franchini, Mauro,Fochi, Mariafrancesca,Leo, Virginia,Mazzanti, Andrea,Ricci, Alfredo
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supporting information; experimental part
p. 3399 - 3406
(2011/02/23)
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- Synthesis, crystal structure and spectroscopic study of para substituted 2-hydroxy-3-methoxybenzalideneanilines
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Eight Schiff bases derived from 2-hydroxy-3-methoxybenzaldehyde and different para substituted anilines have been synthesized and their structures were elucidated by physical measurements and FT-IR. NMR assignments were made using 1H, 13/
- Yeap, Guan-Yeow,Ha, Sie-Tiong,Ishizawa, Nobuo,Suda, Katsumi,Boey, Peng-Lim,Mahmood, Wan Ahmad Kamil
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- LiBF4-catalyzed formation of fused pyrano- and furanobenzopyrans
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Lithium tetrafluoroborate efficiently catalyzes an unusual cyclization of o-hydroxybenzaldimines with 2,3-dihydrofuran and 3,4-dihydro-2H-pyran at ambient temperature to afford a class of new pyrano- and furanobenzopyran derivatives in excellent yields with high diastereoselectivity.
- Yadav,Reddy,Madhuri, Ch,Sabitha, G,Jagannadh, B,Kumar,Kunwar
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p. 6381 - 6384
(2007/10/03)
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