- Alkylation of Amines Via Tandem Hydroaminomethylation Using Imino-Pyridine Complexes of Rhodium as Catalyst Precursors
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Abstract: Novel cationic Rh(I) imino-pyridine complexes were evaluated as catalyst precursors in the hydroaminomethylation of 1-octene in conjunction with both primary (aniline and benzylamine) and secondary amines (piperidine). These complexes were found
- October, Jacquin,Mapolie, Selwyn F.
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- Synthesis, characterization, and crystal structure analysis of group IIB coordination compounds containing N,N′-bidentate chelating Schiff-base ligand
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The solid-state chemistry of coordination complexes has become an actively developing research area of modern inorganic chemistry. Herein, Zn and Hg coordination compounds containing a N,N′-bidentate chelating Schiff-base ligand were synthesized and then
- Hajiashrafi, Taraneh,Zekriazadeh, Roghayeh,Kubicki, Maciej
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p. 3044 - 3061
(2020/10/15)
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- Silica-coated nano-Fe3O4-supported iminopyridine palladium complex as an active, phosphine-free and magnetically separable catalyst for Heck reactions
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A novel magnetic nanoparticle-supported iminopyridine palladium complex was successfully prepared by attaching palladium acetate to iminopyridine ligand-functionalized silica-coated nano-Fe3O4. The as-prepared catalyst was well characterized and was evaluated in Heck reactions in terms of activity and recyclability. It was found to be highly efficient for the reactions of various aryl iodides and aryl bromides having electron-withdrawing groups with olefins under phosphine-free and inert atmosphere-free conditions. Moreover, the catalyst could be conveniently recovered using an external magnet, and the recyclability was influenced by the base in the Heck reaction. The catalyst could be reused at least six times with no significant loss in activity when triethylamine acted as the base.
- Zhang, Qiang,Zhao, Xin,Wei, Huai-Xin,Li, Ji-Hang,Luo, Jun
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- Study of the effect of a heterocyclic ring end group and an azomethane linkage on mesomorphism
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A novel homologous series RO-C6H4-COO-C6H4-N = CH-C5H4N of liquid crystalline Schiff base esters has been synthesized and studied with a view to correlating molecular structure to the liquid crystal properties on the basis of molecular rigidity and flexibility. All 12 members of series are either monotropic (C1, C3, C5) or enantiotropic (C2, C4, C6 to C16) nematic with the absence of smectogenic character throughout the series. Transition temperatures and LC behavior of the series were determined using an optical polarizing microscope equipped with a heating stage. Transition curves (Cr-N or Cr-I and N-I or I-N) behave in the normal established manner as depicted in a phase diagram. An odd–even effect is exhibited by the N-I transition curve up to the C8 homologue.
- Maheta,Bhoya
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- Palladium-Schiff Base Complex Immobilized Covalently on Magnetic Nanoparticles as an Efficient and Recyclable Catalyst for Heck and Suzuki Cross-Coupling Reactions
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A new palladium-Schiff base complex immobilized covalently on magnetic nanoparticles (Pd-imino-Py-γ-Fe2O3) was synthesized via the reaction of chloro-functionalized γ-Fe2O3 with iminopyridine followed by the reaction with palladium acetate. Characterization of Pd-imino-Py-γ-Fe2O3 was carried out by various techniques such as XRD, SEM, TEM, FT-IR, TGA, ICP, XPS, VSM and elemental analysis. Pd-imino-Py-γ-Fe2O3 was successfully applied as a magnetically recyclable heterogeneous catalyst in Heck and Suzuki cross-coupling reactions of various aryl halides (iodide, bromides and chlorides as challenging substrates) with olefins and phenylboronic acid, respectively. The synthesized catalyst was separated easily by using an external magnet and recycled eight runs without appreciable loss of its catalytic activity and leaching of the significant quantity of Pd. Graphical Abstract: [Figure not available: see fulltext.]
- Sobhani, Sara,Falatooni, Zahra Mesbah,Asadi, Solmaz,Honarmand, Moones
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p. 255 - 268
(2016/02/23)
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- Novel cationic η3-methallyl palladium complexes bearing pyridinyl-imine ligands: Synthesis, characterization and X-ray study
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Ligands (pyridin-2-ylmethylene)anilines (L1-L4) and (1-(pyridin-2-yl)ethylidene)anilines (L5-L6) were obtained by condensation reactions. These ligands react with Pd(dba)2 in the presence of methallyloxytris(dimethylamino)phosphonium hexafluorophosphate [C4H7OP(NMe2)3]+PF6- to give the corresponding monometallic cationic η3-methallylpalladium complexes C1-C6 in high yields. All new complexes C1-C6 have been characterized by CHN analyses, 1H, 13C, 31P NMR and IR spectroscopy. Solid state and electronic structures of complex C5 have been determined.
- Dridi, Sana,Mechria, Ali,Msaddek, Moncef
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p. 217 - 221
(2015/01/30)
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- Recyclable palladium(II) imino-pyridine complex immobilized on mesoporous silica as a highly active and recoverable catalyst for Suzuki-Miyaura coupling reactions in aqueous medium
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A new mesoporous silica supported palladium imino-pyridine complex was successfully prepared by attaching palladium acetates to a novel imino-pyridine ligand functionalized MCM-41. The as-prepared catalyst was characterized by ICP-AES, XRD, FTIR, SEM, and TEM. It was found to be an efficient catalyst for Suzuki-Miyaura coupling reactions in aqueous medium. The reactions of various aryl bromides with arylboronic acids could be carried out under aerobic and low Pd loading (0.1 mol %) conditions with good to excellent yields, and very low Pd leaching (0.2 ppm) was detected. Moreover, the supported catalyst could be simply recovered and reused several times without significant loss of efficiency.
- Zhang, Qiang,Su, Hong,Luo, Jun,Wei, Yunyang
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p. 447 - 454
(2013/02/23)
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- "Click" magnetic nanoparticle-supported palladium catalyst: A phosphine-free, highly efficient and magnetically recoverable catalyst for Suzuki-Miyaura coupling reactions
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A novel magnetic nanoparticle-supported nano-palladium catalyst was successfully prepared via a "click" route. The as-prepared catalyst was well characterized and evaluated in Suzuki-Miyaura coupling in terms of activity and recyclability in aqueous ethanol. It was found to be highly efficient for the reactions of various aryl bromides with arylboronic acids under phosphine-free and low Pd loading (0.2 mol%) conditions. Moreover, the catalyst could be easily separated from the reaction system by an external magnet and reused several times without a remarkable loss of its activity. The Royal Society of Chemistry 2013.
- Zhang, Qiang,Su, Hong,Luo, Jun,Wei, Yunyang
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p. 235 - 243
(2013/03/29)
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- Rhenium(i) and platinum(ii) complexes with diimine ligands bearing acidic phenol substituents: Hydrogen-bonding, acid-base chemistry and optical properties
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Tricarbonylchloro-rhenium(i) (1-4) and catecholato-platinum(ii) complexes (6, 7) of diimine ligands bearing phenol and O-protected phenol substituents have been prepared and fully characterised including single crystal structure analyses of 1, 4 and 7. The redox behaviour of the catecholato platinum(ii) complexes 6 and 7 has been probed by cyclic voltammetry, preparative oxidation and EPR spectroscopy (6+, 7+). Reversible deprotonation of the hydroxy substituted complexes 1, 3 and 6 to 1-, 3- and 6- resulted in significant changes in their electronic spectra. The luminescence properties of the diamagnetic complexes have been investigated using emission spectroscopy. DFT and TD-DFT calculations were invoked to shed some light onto the geometric and electronic structures as well as the experimental spectroscopic properties of the neutral complexes 1-7, the radical cations 6+ and 7+ and the conjugate bases 1-, 3- and 6-.
- Liu, Wei,Heinze, Katja
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p. 9554 - 9564
(2011/01/08)
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