- Non-enolisable Knoevenagel condensate appended Schiff bases-metal (II) complexes: Spectral characteristics, DNA-binding and nuclease activities
-
New Schiff base complexes [Cu(L1)Cl] (1), [Ni(L1)Cl] (2), [Zn(L1)Cl] (3), and [Fe(L2)H2OCl] (4) {L1?=?(4E)-3-(2-hydroxybenzylidene)-4-(2-hydroxyphenylimino)pentan-2-one, L2?=?2,2
- Gubendran, Ammavasi,Kesavan, Mookkandi Palsamy,Ayyanaar, Srinivasan,Mitu, Liviu,Athappan, Periyakaruppan,Rajesh, Jegathalaprathaban
-
-
Read Online
- Efficient and recyclable solid acid-catalyzed alkylation of active methylene compound via oxonium intermediate for atom economical synthesis of organic compounds
-
In the present work, we report the catalytic reaction of active methylene compounds with cyclic enol ethers and aryl acetals through oxonium intermediate under solvent-free conditions using heterogeneous solid acid catalysts. Among studied solid acid catalysts, Amberlyst-15 gave excellent yields (35–85%) of alkylated products. The catalyst showed broader substrate scope, and a recyclable catalytic cost-efficient approach of the alkylation was examined on the different types of cyclic enol ethers and aryl acetal.
- Naikwadi, Dhanaji R.,Bankar, Balasaheb D.,Ravi, Krishnan,Biradar, Ankush V.
-
p. 3691 - 3703
(2021/06/12)
-
- Synthesis and studies on Cu(II), Co(II), Ni(II) complexes of Knoevenagel β-diketone ligands
-
Transition metal complexes of various acetylacetone based ligands of the type ML [where M = Cu(II), Ni(II), Co(II); L = 3-(aryl)-pentane-2,4-dione] have been synthesized. The structural features have been derived from their elemental analysis, magnetic su
- Sumathi, S.,Tharmaraj, P.,Anitha, C.,Sheela, C. D.
-
p. 377 - 383,7
(2012/12/11)
-
- Tetra- and hexadentate Schiff base ligands and their Ni(II), Cu(II) and Zn(II) complexes. Synthesis, spectral, magnetic and thermal studies
-
Tetradentate N2O2, N4 Schiff bases, 1,2-bis(4-oxopent-2-ylideneamino) benzene (BOAB), 1-(4-oxopent-2-ylideneamino-2- [(2-hydroxyphenyl)ethylideneamino] benzene (OAHAB), 7,16-bis(4- chlorobenzylidene)-6,8,15,17-tetra-methyl-7,16-dihydro -5,9,14,18-tetraza- dibenzo[a,h] cyclo tetradecene (BCBDCT), 7,16-bis(2-hydroxy-benzylidene)-6,8,15, 17-tetramethyl-7,16-dihydro-5,9,14,18-tetraza-dibenzo [a,h] cyclo tetradecene (BHBDCT) and hexadentate N4O2 Schiff bases, 2,4-bis {2-[1-(2-hydroxyphenyl) ethylideneamino] phenylimino}-3-(2-hydroxybenzylidene) pentane (BHAPHP), 2,4-bis {2-[1-(2-hydroxyphenyl) ethylideneamino] phenylimino}-3-(4-chlorobenzylidene) pentane (BHAPCP) were prepared and characterized by elemental analysis, IR, UV-Vis, 1H NMR and mass spectra. The solid complexes of the prepared Schiff base ligands with Ni(II), Cu(II) and Zn(II) ions were isolated and characterized by elemental and thermal analyses, IR, electronic and ESR spectra as well as conductance and magnetic susceptibility measurements. The results showed that most complexes have octahedral geometry but few can attain the tetrahedral arrangement. The TG analyses suggest high stability for most complexes followed by thermal decomposition in different steps. The kinetic and thermodynamic parameters for decomposition steps in Cu(II) complexes thermograms have been calculated.
- Ismail, Tarek M.A.,Saleh, Akila A.,Ghamry, Mosad A. El
-
experimental part
p. 276 - 288
(2012/01/31)
-
- Synthesis, spectral characterization, electrochemical behaviour and antibacterial activity of mixed ligand copper(II) and zinc(II) complexes of 3,4-substituted β-diketones with 2,2′-bipyridine
-
Six new mixed-ligand copper(II) and zinc(II) complexes of the composition [ML(bpy)2]Cl2, where M = CuII/ZnII ; L = 3,4-substituted β-diketone derived from salicylaldehyde and acetylacetone/methylacetoacetate/acetoacetanilide and bpy = 2,2′- bipyridine, were synthesized. They were characterized by usual analytical and spectral techniques. The data show that the complexes exhibit octahedral geometry. The powder XRD study confirms the structural similarity of the copper and zinc complexes. The salient features of their electrochemical behaviour have been discussed. The antibacterial activities of the free ligands and their complexes have been screened against various microorganisms (both Gram-positive and Gram-negative bacteria). The data indicate that the complexes are highly active than the free ligands.
- Raman
-
experimental part
p. 1082 - 1088
(2009/12/31)
-