- Structure and characterization of bis(N-p-chloro-phenyl-salicylideneaminate) Schiff base copper(II) complex: Cu[N-p-Cl-Ph-Sal]2
-
The crystal and molecular structure of the title compound has been determined by X-ray crystallography. It crystallizes in the monoclinic system, space group P21/c, with lattice parameters a = 13.678(3), b = 10.729(2), c = 8.1996(2) A, β= 98.96°, V = 1188.7(4) A 3, and Z = 4. The crystal structure contains two centrosymmetric molecules of bis (N-p-chloro-phenyl-salicylideneaminate) Schiff base copper(II). Copper(II) ion is coordinated in a slightly distorted trans square-planar configuration, the distortion consisting of a reduction of the N-Cu-O angle with the chelate rings from the ideal value of 90°. The p-chlorophenyl rings with salicylidene moieties form a dihedral angle of 38.96°.
- Han, Qiaofeng,Jian, Fangfang,Lu, Lude,Yang, Xujie,Wang, Xin
-
-
Read Online
- Nonlinear optical properties of some derivatives of salicylaldimine-based ligands
-
A series of potential nonlinear optical (NLO) compounds, (-OH) and (-Cl) substituted derivatives of salicylaldimine-based ligands 1-6 (Fig. 2), was designed and synthesized. Compounds 1 and 2 were characterized by X-ray diffraction analysis, elemental analysis, IR, 1H-NMR, 13C-NMR and UV-Visible spectroscopies. The electric dipole moments (μ) and the first hyperpolarizabilities (β) of the compounds 1-6 were calculated using ab-initio quantum calculations (finite field M?ller Plesset perturbation theory). The calculation results reveal that the substituent positions play a significant role in NLO properties of these compounds.
- Karaka?,Elmali,ünver,Svoboda
-
-
Read Online
- Facile synthesis, solublization studies and anti-inflammatory activity of amorphous zinc(Ii) centered aldimine complexes
-
In this study, Zn(II) centered complexes with aldimine derivatives were synthesized using green solvent, polyethylene glycol (PEG-400) and amorphous complexes were characterized by FT-IR, multinuclear (1H and13C NMR), elemental and thermal analysis. Thermogravimetric analysis indicated the extended thermal stability of the synthesized complexes. All the Zn(II) complexes show very significant photoexcitation in the range of 318 – 384 nm and photoemission in the range of 502 – 562 nm. Among all the complexes, Zn(II) complex (3Zn) showed minimum band gap value, 2.35 eV. These amorphous complexes have been reported for their wide applications in biomedical sciences. The synthesized aldimine ligands and Zn(II) complexes were investigated for anti-inflammatory activity and these complexes showed more anti-inflammatory potential than the corresponding aldimine ligands. The solubilization of zinc complexes in sodium dodecyl sulphate was also investigated to reveal the interaction of metal complexes by using UV-Visible spectroscopy and electrical conductivity measurements.
- Ali, Uzma,Alshater, Heba,Imran, Muhammad,Maalik, Aneela,Noor, Sadia,Qureshi, Ahmad Kaleem,Raheel, Ahmad,Sharif, Muhammad,Taj, Muhammad Babar,Tirmizi, Syed Ahmad
-
p. 929 - 941
(2021/06/26)
-
- Influence of substituents on the structure of Schiff bases Cu(II) complexes
-
The relationship between molecular conformation and substituent effects of salicylaldehyde Schiff-base Cu(II) complexes was explored. For this study, eight samples of the complexes Cu(Sal-X)2 (X = OMe, Me, H, F, Cl, Br, CF3 and CN) w
- Xiao, Yan,Cao, Chenzhong
-
-
- Synthesis, spectroscopic characterization and computational studies of Schiff base complexes of tin(IV) chloride
-
Reaction of anhydrous tin(IV) chloride with mono functional bidentate Schiff bases (sbnH), in 1:2 molar ratios, gives complexes of the type, [(sbn)2SnCl2] (1-4) (where, n=1-4; sb=2-(((4-chlorophenyl)imino)methyl
- Jaiswal, Nitesh,Kushwaha, Ajeet Kumar,Singh, Avadhesh Pratap,Dubey, Raj Kumar
-
-
- Effect of substituents on the UV spectra of supermolecular system: Silver nanoparticles with bi-aryl Schiff bases containing hydroxyl
-
Effect of substituents on the ultraviolet (UV) spectra of supermolecular system involving silver nanoparticles (AgNPs) and Schiff bases was investigated. AgNPs and 49 samples of model compounds (MC), bi-aryl Schiff bases containing hydroxyl (XBAY, involving 4-OHArCH?NArY, 2-OHArCH?NArY, XArCH?NAr-4′-OH, and XArCH?NAr-2′-OH), were synthesized. The size of AgNPs was characterized by transmission electron microscopy (TEM), and the UV absorption spectra of AgNPs, XBAYs, and MC-AgNPs mixed solutions were measured, respectively. The results show that (1) the size of AgNPs is larger in MC-AgNPs solutions than that in AgNPs solution due to the distribution of MC molecules on the surface of AgNPs; (2) the UV absorption wavelength of XBAYs changes in the action of AgNPs and their wavelength shift exists limitation between XBAY and MC-AgNPs solutions; and (3) the wavelength shift limit of MC-AgNPs (λWSL) is influenced by the substituents X and Y and the position of hydroxyl OH. The wavenumber ΔνWSL of λWSL can be quantified by employing the excited-state substituent constant σexCC and Hammett constant σ of substituents X and Y. Comparing with the 4-OH, the 4′-OH makes the ΔνWSL a red shift, whereas the 2′-OH, comparing with the 2-OH, makes the ΔνWSL a blue shift.
- Cao, Chao-Tun,Cheng, Shimao,Zhang, Jingyuan,Cao, Chenzhong
-
-
- Ru(III) complexes of phenoxy-imine ligands: Synthesis, characterisation and testing as oxidation catalysts
-
Summary: A series of new mononuclear Ru(III) complexes bearing phenoxy-imine Schiff base tetradentate ligands (phenylimino, 4-chlore phenylimino, 3,4-dichlore phenylimino) have been prepared and characterized by elemental analysis, TGA, UV-VIS, FT-IR, 1H-NMR and 13C NMR spectra. The proposed structure of the ligands have a O2N2 core to form mononuclear Ru (III) complexes. Preliminary studies on the catalytic performances of the compounds in the cycloalkane oxydation are described. The catalytic effect of all Ru complexes results in the epoxidation reaction of cyclohexane, as shown in the substrate conversion reaction appears to be very high.
- ?apan, Ali,Ceyhan, G?khan,S?nmez, Mehmet
-
p. 758 - 769
(2019/10/28)
-
- Syntheses, structures and catalytic properties of ruthenium(II) nitrosyl complexes with bidentate and tetradentate Schiff base ligands
-
Treatment of Ru(NO)Cl3·xH2O with 1 equiv. bidentate Schiff bases in the presence of triethylamine in DMF/THF afforded a series of anionic ruthenium(II) nitrosyl complexes of the type [Et3NH][Ru(κ2-N,O-LR)(NO)Cl3] (HLR = 2-butyliminomethyl-phenol 1, 2-(benzylimino-methyl)-phenol 2, 2-[(4-chloro-phenylimino)-methyl]-phenol 3, 2-[(4-nitro-phenylimino)-methyl]-phenol 4, 2-[(2,6-diisopropyl-phenylimino)-methyl]-phenol 5). Interaction of Ru(NO)Cl3·xH2O and 1 equiv. tetradentate Schiff bases under the same condition led to isolation of an anionic complex [Et3NH][Ru(κ2-N,O-L-CH2CH2-NOH)-(NO)Cl3] (HL-CH2CH2-NOH = N,N′-disalicylidene-1,2-ethanediamine 6) and a neutral complex [Ru(salen-phn)(NO)Cl] (H2salen-phn = N,N′-disalicylidene-1,2-phenyldiamine 7). The molecular structures of 1·?C2H5OH, 2–6, and 7·CH2Cl2 have been determined by single-crystal X-ray crystallography. Investigation of the catalytic properties of ruthenium(II) nitrosyl complexes 1–7 showed that they are efficient catalytic precursors for the transfer hydrogenation of acetophenone.
- Wu, Fule,Wang, Chang-Jiu,Lin, Hui,Jia, Ai-Quan,Zhang, Qian-Feng
-
p. 718 - 723
(2017/12/26)
-
- Synthesis, spectral studies and DFT calculation of copper(II) complexes with mixed ligands
-
The reaction of copper(II) chloride with Schiff bases and alkanolamines in 1:1:1 molar ratio(s) resulted a series of mixed ligand copper(II) complexes of general formula [Cu(sb)(aa)] (1-6), [where sb = Schiff base; salicylidine-1-aminobenzene (sabH) (1,4)
- Kumar, Manoj,Anjum, Afreen,Jaiswal, Nitesh,Dubey, Raj Kumar
-
p. 1679 - 1684
(2018/06/12)
-
- Carbocation Organocatalysis in Interrupted Povarov Reactions to cis-Fused Pyrano- and Furanobenzodihydropyrans
-
Tritylium cation-catalyzed interrupted Povarov reactions afforded cis-4-aminobenzodihydropyrans in excellent yields (90 %) within 10 min by low catalyst loadings (1 mol-%). A mechanism involving Lewis acidic catalysis by a carbocation was proposed and val
- Liu, Jingjing,Xu, Jiaxi,Li, Zhenjiang,Huang, Yu,Wang, Haixin,Gao, Yu,Guo, Tianfo,Ouyang, Pingkai,Guo, Kai
-
p. 3996 - 4003
(2017/07/28)
-
- Synthesis, structure and catalytic activity of bis(phenoxyiminato)iron(III) complexes in coupling reaction of CO2 and epoxides
-
Here we described the synthesis and characterization of a series of new bis(phenoxyiminato)Fe(III)-chloro complexes using a variety of techniques, including: elemental analysis, IR-, MS(EI), UV-Vis-spectroscopy, and X-ray diffraction. A solid-state structure of bis(N-salicylidene-3-phenylpropylamine)iron(III)chloride reveals a distorted square-pyramid coordination with crystallographic C2-symmetry wherein chloride occupies the axial position. Isolated complexes were also evaluated as catalysts for a coupling reaction of CO2 and various epoxides, including propylene, 1-hexene, cyclohexene and styrene oxides to form corresponding cyclic carbonates. Accordingly, the ligand structure and the solvent used influenced the catalytic activity and marked enhancement in the activity was observed using DMF as a solvent. Under optimized reaction conditions (145 °C and 10 bar of CO2) bis(N-salicylidene-2-phenylethylamine)iron(III)chloride gave cyclopropylene carbonate with considerable high TON value (1029) within 3 h.
- Al-Qaisi, Feda'a,Genjang, Nevil,Nieger, Martin,Repo, Timo
-
-
- Substituent effects on the absorption and vibrational spectra of some 2-hydroxy Schiff bases: DFT/TDDFT, natural bond orbital and experimental study
-
The electronic structure of salicylideneaniline (SA) and some of its derivatives are investigated both experimentally and theoretically. The equilibrium geometric structures of the studied compounds are determined at the B3LYP/6-311++Glevel of theory. A set of 12 substituted SA derivatives is considered in the present work. The choice of these substituents aims to create a push-pull system on the SA basic structure which would shade light onto its photo physics. The electronic absorption spectra of SA are recorded in the UV-VIS region, in both polar and nonpolar solvents. Assignments of the observed electronic transitions are facilitated via time-dependent density functional theory (TDDFT) computations at the same level of theory. Electronic configurations contributing to each excited state are identified and the relevant MOs are characterized. The extent of delocalization and intramolecular charge transfer are estimated and discussed in terms of natural bond orbitals (NBO) analysis and second order perturbation interactions between donor and acceptor MOs. Solvent effects on the electronic absorption spectra are discussed in terms of the difference in polarizabilities of the ground and excited states. FTIR spectra of SA and its derivatives are measured in KBr platelets. Detailed vibrational assignments are given based on the calculated potential energy distributions. "IR marker bands" that characterize the SA framework are identified. The effect of substituents, the nature of the characteristic "marker bands", and intensity quenching of some bands are discussed.
- Elroby,Aboud,Aziz,Hilal
-
p. 414 - 427
(2015/08/06)
-
- One pot photoredox decarboxylation reaction of N-cyano(α-bromo- α-phenyl)methylanilines leading to synthesis of four-membered cyclic carbamates
-
A new four-membered cyclic carbamates have been synthesized through solar irradiation of N-cyano(α-bromo-α-phenyl)methylanilines in their aqueous methanolic solution using iodide salt in basic medium. These compounds have been characterized as 3,4-diphenyl-1,3oxazetidin-2-one through their elemental analysis, IR, 1H-NMR, 13C-NMR, and mass spectral studies.
- Kaur, Manpreet,Singh, Baldev
-
p. 850 - 853
(2014/06/10)
-
- Synthesis, structural characterization, and catalytic activity of ruthenium(II) monocarbonyl complexes with bidentate Schiff base and triphenylphosphine ligands
-
Treatment of [RuHCl(CO)(PPh3)3] with equal amounts of equiv bidentate Schiff base 2[(4-chloro-phenylimino)-methyl]-phenol (HL-Cl) or 2(p-tolylimino-methyl)-phenol (HL-Me) or 2[(4-nitro-phenylimino)-methyl]-phenol (HL-NO2) in the presence of triethylamine afforded [RuCl(2-N,O-L-Cl) (CO)(PPh3)2] (1), [RuCl(2-N,O-L-Me)(CO)(PPh3)2] (2), and [RuCl( 2-N,O-L-NO2)(CO)(PPh3)2] (3), respectively The molecular structures of 1, 2, and 3·1.5C6H14 have been determined by single-crystal X-ray crystallography Complexes 1-3 were used for oxidation of primary and secondary alcohols to aldehydes and ketones as catalysts in the presence of N-methylmorpholine-N-oxide 2013
- Yin, Xiao-Feng,Lin, Hui,Jia, Ai-Quan,Chen, Qun,Zhang, Qian-Feng
-
p. 3229 - 3240
(2013/10/21)
-
- A quick route for the synthesis of 3-Aryl-3,4-dihydro-2H-benz[e]-1,3- oxazin-2-ones
-
N-(2-Hydroxy)-benzyl-arylamines (1) gave substantially pure 3-aryl-3,4-dihydro-2H-benz[e]-1,3-oxazin-2-one 2 on cyclization with carbonyldiimidazole in DMSO in 20-30 min at 20-25 °C in excellent yields.
- Shukla, Davender Kumar,Rani, Manju,Khan, Arif Ali
-
p. 4537 - 4540
(2013/06/27)
-
- Efficient synthesis of 2,3-disubstituted-1,3-benzoxazines by chlorotrimethylsilane-mediated aza-acetalizations of aromatic aldehydes
-
A series of novel substituted 3,4-dihydro-2H-1,3-benzoxazines were prepared in moderate to good yields by aza-acetalizations of aromatic aldehydes with 2-(N-substituted aminomethyl)phenols in the presence of chlorotrimethylsilane or SnCl4. It w
- Tang, Zilong,Zhu, Zhonghua,Yan, Lin,Chang, Shuhong,Liu, Hanwen
-
p. 1116 - 1120
(2013/10/21)
-
- Synthesis and distinct urease enzyme inhibitory activities of metal complexes of Schiff-base ligands: Kinetic and thermodynamic parameters evaluation from TG-DTA analysis
-
Transition metal [Co, Ni, Cu and Zn(II) acetates] complexes of salicylaldehyde derived Schiff bases, 2-{(E)-[(4-chlorophenyl)imino]methyl} phenol (CIMP) and 2-{(E)-[(4-bromophenyl)imino]methyl}phenol (BIMP) were synthesized and characterized by various analytical and spectroscopic studies. The Schiff base ligands and their metal complexes were also screened for their urease, α-chymotrypsin, acetylcholinesterse and butyrylcholinesterase inhibition activities. The ligands were found active against α-chymotrypsin with IC50 ± S.E.M. = 305.0 ± 3.2 and 330.6 ± 1.6 μM respectively. The copper complexes of both the ligands were found active in inhibiting urease enzyme with IC50 ± S.E.M. = 10.7 ± 0.2 and 5.0 ± 0.1 μM respectively, as compared to standard inhibitor. Structure activity relationship (SAR) was evaluated using autodock programme. It was found that the active complexes block the entrance cavity to the enzyme. All the complexes were evaluated for their thermal degradation studies using TG-DTA analytical methods in static air. Thermodynamic and kinetic parameters were evaluated from the TG/DTA curves using Horowitz-Metzger method.
- Ikram, Muhammad,Rehman, Sadia,Faridoon,Baker, Robert J.,Rehman, Hanif Ur,Khan, Ajmal,Choudhary, Muhammad Iqbal,-Rehman, Saeed-Ur
-
-
- Synthesis and biological activity of some 3-aryl-3,4-dihydro-2h-benz[e]-1, 3-oxazines/6-bromo-3-aryl-3,4-dihydro-2h-benz[e]-1,3-oxazines
-
N-(2-Hydroxy)-benzyl-arylamine (1) gives substantially pure 3-aryl-3,4-dihydro-2H-benz[e]-1,3-oxazines/6-bromo-3-aryl-3,4-dihydro-2H-benz[e] -1,3-oxazines (2) on cyclization with formaldehyde in methanol within 0.5-1.0 h at 65-68 C in excellent yields. Th
- Shukla, Davender Kumar,Rani, Manju,Khan, Arif Ali,Tiwari, Kavita,Gupta, Rajinder K.
-
p. 5921 - 5924
(2013/07/26)
-
- Exploration of α-aminophosphonate N-derivatives as novel, potent and selective inhibitors of protein tyrosine phosphatases
-
Seventeen α-aminophosphonates are synthesized. Their compositions and structures are established by EA, UV, FT-IR, 1H NMR, 13C NMR, 31P NMR and ESI-MS. Compounds 1-4 are confirmed by X-ray crystallography. PTP inhibition shows compounds 1-5, 12, 15 are moderate competitive inhibitors with some selectivity. The most potent inhibitor is compound 5 with the lowest IC50 value about 6.64 μM against PTP1B, about 2-fold and 25-fold stronger than against TCPTP and PTP-MEG2 while it doesn't inhibit SHP-1 and SHP-2. The binding constant of 5 to PTP1B is 2.23 × 105 M-1 and binding ratio approximates 1:1. Cell viability and apoptosis assays indicate 5 is cell permeable with lower cytotoxicity. The results indicate α-aminophosphonates are possibly developed to effective and selective inhibitors of PTPs.
- Wang, Qingming,Zhu, Miaoli,Zhu, Ruiting,Lu, Liping,Yuan, Caixia,Xing, Shu,Fu, Xueqi,Mei, Yuhua,Hang, Qingwei
-
experimental part
p. 354 - 364
(2012/04/23)
-
- Halide substituted Schiff-bases: Different activities in methyltrioxorhenium(VII) catalyzed epoxidation via different substitution patterns
-
This report shows the influence of halide substituted Schiff-bases as ligands of methyltrioxorhenium (MTO) in epoxidation catalysis. Therefore, selected Schiff-bases were prepared by the reaction of hydroxy-benzaldehydes and aniline derivates. These differently substituted Schiff-bases were tested as MTO-ligands in cyclooctene-and 1-octene-epoxidation. Although no great disparities among the substitution patterns have been found, some conclusions can be drawn. Flourines are inferior to chlorines or bromines as substituents. Halides in ortho-position lead to higher activities than in para-or meta-position. The balance between electron donating and withdrawing influences at the Schiff-base plays a prominent role in their utility as ligand to MTO in epoxidation catalysis.
- Altmann, Philipp,Cokoja, Mirza,Kühn, Fritz E.
-
experimental part
p. 51 - 55
(2012/03/11)
-
- SnCl4-catalyzed aza-acetalization of aromatic aldehydes: Synthesis of aryl substituted 3,4-dihydro-2H-1,3-benzoxazines
-
Stannic tetrachloride was an efficient Lewis acid catalyst for the aza-acetalization of aromatic aldehydes with o-arylaminomethyl phenols, and a series of novel aryl substituted 3,4-dihydro-2H-1,3-benzoxazines were prepared in good yields under mild condi
- Tang, Zilong,Chen, Weiwen,Zhu, Zhonghua,Liu, Hanwen
-
scheme or table
p. 1372 - 1383
(2012/04/04)
-
- Synthesis and fungicidal activity of novel 2,3-disubstituted-1,3- benzoxazines
-
A series of new 2,3-disubstituted-3,4-dihydro-2H-1,3-benzoxazines were prepared in moderate to excellent yields by aza-acetalizations of aromatic aldehydes with 2-(N-substituted aminomethyl)phenols in the presence of TMSCl. Their structures were confirmed
- Tang, Zilong,Zhu, Zhonghua,Xia, Zanwen,Liu, Hanwen,Chen, Jinwen,Xiao, Wenjing,Ou, Xiaoming
-
scheme or table
p. 8174 - 8185
(2012/09/25)
-
- The substituent effects on the 13C chemical shifts of the azomethine carbon atom of N-(substituted phenyl)salicylaldimines
-
Hammett correlations between the 13C-NMR chemical shifts of the azomethine carbon atom and the corresponding substituent constants were established for thirteen Schiff bases. The successful correlation of the chemical shifts with the electrophilic substituent constants σ+ indicate a significant resonance interaction of the substituents on the aniline ring with the azomethine carbon atom in the examined series of imines. The demand for electrons in the investigated compounds was compared to that of the N-benzylideneanilines and N-(substituted phenyl)pyridinealdimines. The manner of transmission of the substituent effects is discussed and they were separated into resonance and inductive effects. The inductive effects prevail over the resonance effects.
- Drmanic, Sasa Z.,Marinkovic, Aleksandar D.,Nikolic, Jasmina B.,Jovanovic, Bratislav Z.
-
p. 993 - 1001
(2012/10/29)
-
- GREEN SYNTHESIS OF ARYL ALDIMINES USING ETHYL LACTATE
-
The present invention relates to a method for preparing aryl aldimines. In particular, the present invention relates to methods of preparing aryl aldimines that uses environmentally friendly solvent systems.
- -
-
Page/Page column 4-5
(2011/08/22)
-
- Evaluation of N-(2-thienylidene)amines, N-(2-hydroxybenzylidene)amines and 3-iminoindolin-2-ones as antileishmanial agents
-
The paper describes the synthesis and antileishmanial activity of N-substituted imines, obtained from the reactions of primary amines with three biologically important aldehydes/ketones, thiophene-2-carbaldehyde, 2- hydroxybenzaldehyde (salicylaldehyde) and indoline-2,3-dione. Of the fourteen compounds screened from three classes, five compounds showed significant antileishmanial activity. Among the three classes of imines, the class of N-(2- thienylidene)amines showed much better activity than the other two classes. N-(2-Thienylidene)benzhydrylamine showed IC50 value of 0.51 μg/ml. The effect of substituents on the bioactivity is discussed.
- Al-Kahraman, Yasser M.S.A.,Singh, Girija S.,Yasinzai, Masoom
-
experimental part
p. 491 - 495
(2012/06/18)
-
- Antihyperglycemic, α-glucosidase inhibitory and DPPH free radical scavenging activity of 5-bromosalicylaldehyde and schiff bases
-
α-Glucosidase inhibition and DPPH free radical scavenging by 5-bromosalicylaldehyde and some Schiff bases have been measured. 5-Bromosalicylaldehyde shows lowest IC50 value (8.80 μM) for α-glucosidase inhibition and also shows good results in in vivo experiments for antihyperglycemic potential. Springer Science+Business Media, LLC 2010.
- Misra, Sristicheta,Pandeya, Krishna Bihari,Tiwari, Ashok Kumar,Ali, Amtul Zehra,Saradamani, Thimmapatruni,Agawane, Sachin Bharat,Madhusudana, Kuncha
-
experimental part
p. 1431 - 1437
(2012/05/20)
-
- Synthesis of 2,3-diaryl-3,4-dihydro-2H-1,3-benzoxazines and their fungicidal activities
-
A series of novel 2,3-diaryl-3,4-dihydro-2H-1,3-benzoxazines have been prepared in high yields from o-arylaminomethylphenols and aromatic aldehydes in the presence of SnCl4 for the first time, and their fungicidal activities were investigated t
- Tang, Zilong,Chen, Weiwen,Zhu, Zhonghua,Liu, Hanwen
-
scheme or table
p. 255 - 260
(2011/06/19)
-
- Colorimetric and fluorescence sensing of fluoride anions with potential salicylaldimine based schiff base receptors
-
Salicylaldimine based schiff base receptors with different substituents showing fluorescent enhancement in the presence of fluoride anion was visualized through naked eye as well as by change in spectral properties (UV-vis and fluorescent techniques). The reason for such fluorescence enhancement may be due to hydrogen bond interaction between receptor recognition site and fluoride anion. Such a hydrogen bond interaction creates a six-membered transition state, which avoids quenching processes. To support this, fluorescence enhancement factor (FEF) was calculated and it was found to be more (FEF = 652) for -NO2 substituted receptor compared to other receptors.
- Sivakumar, Radhakrishnan,Reena, Vijayaragavan,Ananthi, Nallamuthu,Babu, Muthiya,Anandan, Sambandam,Velmathi, Sivan
-
experimental part
p. 1146 - 1151
(2010/05/01)
-
- Catalytic asymmetric mannich-ketalization reaction: Highly enantioselective synthesis of aminobenzopyrans
-
"Chemical Equation Present" Domino catalysis: We have developed the first enantioselective domino Mannich-ketalization reaction of o-hydroxy benzaldimines with electron-rich alkenes (see scheme). The new reaction sequence provides an easy and direct acces
- Rueping, Magnus,Lin, Ming-Yuan
-
supporting information; experimental part
p. 4169 - 4172
(2010/07/05)
-
- Catalytic asymmetric inverse-electron-demand (IED) [4+2] cycloaddition of salicylaldimines: Preparation of optically active 4-aminobenzopyran derivatives
-
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
-
supporting information; experimental part
p. 3399 - 3406
(2011/02/23)
-
- Synthesis, crystal structure and electronic properties of bis(N-2-bromophenyl-salicydenaminato)copper(II) complex
-
A new series of complexes of the type bis(N-substituted-salicydenaminato)copper(II) (1-9), have been synthesized and characterized by IR, UV-Vis and elemental analysis methods. The molecular structure of bis(N-2-bromophenyl-salicydenaminato)copper(II) (6)
- Vafazadeh, Rasoul,Hayeri, Vahid,Willis, Anthony C.
-
experimental part
p. 1810 - 1814
(2010/07/04)
-
- Synthesis and antifungal activity of some new 1, 2-benzisoxazole
-
Various 3H-N-substituted phenyl / thiazolyl 1,2-benzisoxazole have been synthesized by the reaction of schiffs base with DMSO-I2 in presence of H2SO4 and characterized by IR,NMR spectral studies and elemental analysis. These compounds showed significant activities against plant pathogenic fungi viz. Alterneria burnsii and Macrophomina phasiolina.
- Sareen,Khatri,Shinde,Chugh,Sareen
-
experimental part
p. 33 - 34
(2011/06/21)
-
- Ethyl lactate as a tunable solvent for the synthesis of aryl aldimines
-
Ethyl L-lactate can be tuned with a cosolvent to create polarity conditions ideal for synthesizing aryl aldimines that crystallize directly out of solution within minutes under ambient conditions in excellent yields and requiring no further purification.
- Bennett, Jacqueline S.,Charles, Kaitlyn L.,Miner, Matthew R.,Heuberger, Caitlin F.,Spina, Elijah J.,Bartels, Michael F.,Foreman, Taylor
-
body text
p. 166 - 168
(2010/04/22)
-
- LiBF4-catalyzed formation of fused pyrano- and furanobenzopyrans
-
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
-
p. 6381 - 6384
(2007/10/03)
-
- Zr4+-catalyzed efficient synthesis of α-aminophosphonates
-
Aldimines undergo nucleophilic addition with diethyl phosphite in the presence of a catalytic amount of zirconium tetrachloride at ambient temperature to afford the corresponding α-aminophosphonates in high yields with high selectivity.
- Yadav,Reddy,Raj,Reddy,Prasad
-
p. 2277 - 2280
(2007/10/03)
-
- Indium-mediated deoxygenation of nitrones, N-oxides and deoxygenative reductive coupling of nitrones to vicinal diamines
-
We reported transformation of nitrones selectively either to aldamines or vicinal diamines and deoxygenation of N-oxides using Indium at ambient temperature in good yields.
- Jeevanandam, Arumugasamy,Cartwright, Charles,Ling, Yong-Chien
-
p. 3153 - 3160
(2007/10/03)
-
- New Route for the Preparation of 2H-3-Aryl-3,4-dihydro-1,3-benzoxazines and 2H-3-Aryl-3,4-dihydro-4-methyl-1,3-benzoxazines
-
2-Hydroxybenzaldehyde (1) and 1-(2-hydroxyphenyl)ethanone (2) on reaction with different primary aromatic amines gave 2-(arylimino)methylphenols (3) and 2-phenols (4), respectively. 3 and 4 on reduction with sodium borohydride gave 2-(arylamino)methylphenols (5) and 2-phenols (6), which underwent cyclisation with formaldehyde to form 2H-3-aryl-3,4-dihydro-1,3-benzoxazines (7) and 2H-3-aryl-3,4-dihydro-4-methyl-1,3-benzoxazines (8), respectively.
- Joglekar, S. J.,Samant, S. D.
-
p. 110 - 111
(2007/10/02)
-
- The Electrochemical Synthesis of Neutral Zinc(II) Complexes of Schiff Base Ligands: The Crystal Structure of Biszinc(II)
-
The electrochemical synthesis and physico-chemical properties of neutral zinc(II) complexes of bidentate Schiff bases derived from salicylaldehydes are presented together with the X-ray structure of biszinc(II).The crystal is monoclinic, a = 21.877(3), b = 8.801(2), c = 12.027(5) Angstroem, β = 96.55(3) deg, space group C2/c.The complex is a monomer, and the zinc atom is tetrahedrally coordinated. - Keywords: X-Ray, Zinc, Schiff Bases, Electrochemical Synthesis
- Sogo, T.,Romero, J.,Sousa, A.,Blas, A. de,Duran, M. L.,Castellano, E. E.
-
p. 611 - 615
(2007/10/02)
-
- Substituted Salicylaldimine Complexes of Aluminium
-
Reactions of monobasic bidentate N-(p-fluorophenyl)- and N-(p-chlorophenyl)-salicylaldimines with aluminium isopropoxide in anhydrous benzene in different molar ratios yield complexes of the types Al(OPri)3-n(SB)n(where n
- Chaturvedi, K. K.,Singh, R. V.,Tandon, J. P.
-
p. 774 - 775
(2007/10/02)
-
- Substituent Effect and Mechanism of the Thermal Retautomerization of Flashed Salicylidene Anilines
-
V-shaped Hammett plots are obtained with a series of p-substituted salicylidene anilines for the relaxation rate of their phototautomers.This is interpreted by a change-over in the mechanism from O-protonation (donor substituents) to NH-deprotonation (acc
- Grummt, U.-W.
-
p. 227 - 234
(2007/10/02)
-
- Synthesis and Characterisation of Binuclear Silicon-Aluminium and Arsenic-Aluminium Complexes with Schiff Bases
-
Trimethylsilyl acetate or phenylarsonic acid on reaction with aluminium isopropoxide yields two new series of complexes of the types, (CH3)3Si-O-Al(OPri)2 and .The isopropoxy groups in these derivatives further undergo facile reactions with bidentate Schiff bases giving coloured complexes of the types (CH3)3Si-O-Al(SB-H)2 and respectively, where SB-H is deprotonated form of the Schiff base.The Si-Al type of compounds are monomeric in nature and nonelectrolytes in DMF and DMSO, where the As-Al type of derivatives are insoluble in most of the organic solvents and appear to be polymeric in nature.A few compounds have been found to be quite effective as potential pesticides.
- Chaturvedi, Vibhav,Tandon, J. P.
-
p. 422 - 424
(2007/10/02)
-
- Schiff Base Stannoboroxanes
-
Schiff base stannoboroxanes having the general formula (where is the donor system of the monofunctional bidentate schiff base) have been synthesised.The resulting complexes have been characterised by elemental analyses, molecular weight dete
- Chaturvedi, Vibhav,Bhal, L.,Tandon, J. P.
-
p. 1039 - 1041
(2007/10/02)
-
- Study of Formation Constants of Substituted Salicylanils and 2'-Hydroxysalicylanils
-
The proton-ligand stability constants of some substituted salicylanils and 2'-hydroxy-salicylanils have been studied by the Bjerrum-Calvin pH titration technique in water-dioxane medium (1:3 v/v) at μ ca. 0.1 (NaClO4) and at 30 deg C (+/-0.1).The results
- Dodwad, S.S.,Patil, Indira,Datar, M.G.
-
p. 595 - 597
(2007/10/02)
-
- REACTIONS OF DICHLOROBIS(CYCLOPENTADIENYL)ZIRCONIUM(IV) WITH BIDENTATE SCHIFF BASES DERIVED FROM SALICYLALDEHYDE AND 4-SUBSTITUTED ANILINES
-
Dichloro bis(cyclopentadienyl)zirconium(IV), Cp2ZrCl2, reacts with bidentate Schiff bases such as salicylidene-4-anisidine, salicylidene-4-phenetidine, salicylidene-4-chloroaniline, salicylidene-4-bromoaniline, salicylidene-4-iodoaniline and salicylidene-4-nitroaniline in a 1:1 molar ratio in refluxing tetrahydrofuran in the presence of triethylamine to yield Cp2Zr(SB)Cl, where (SB)- is the anion of the corresponding Schiff base, SBH.The new derivatives have been characterized on the basis of elemental analysis, molecular weight determination, conductance measurement and spectral (IR, 1H NMR) and electronic studies.
- Sharma, A. K.,Khera, B.,Kaushik, N. K.
-
p. 123 - 130
(2007/10/02)
-
- (Chloro)(N-arylsalicylaldiminato)bis(indenyl)titanium(IV) Compounds
-
Titanium(IV) complexes of the type (C9H7)2Ti(SB)Cl have been synthesised by the reaction of bis(indenyl)titanium(IV) dichloride and bidentate schiff base (SBH) in a 1:1 molar ratio in refluxing tetrahydrofuran in the presence of triethylamine.The new complexes have been characterised on the basis of their elemental analyses, conductance measurements and spectral (IR, 1H NMR and electronic) studies.
- Sharma, Anand,Khera, Brij,Kaushik, Narender K.
-
p. 816 - 817
(2007/10/02)
-
- Bis(indenyl)zirkonium(IV) Complexes of Monofunctional Bidentate Salicylidimines
-
A series of (C9H7)2Zr(SB)Cl complexes where SB(-) is the anion of bidentate Schiff base derived from salicylaldehyde and 4-substituted anilines, viz. salicylidene-4-anisidine, salicylidene-4-phenetidine, salicylidene-4-chloroaniline, salicylidene-4-bromoaniline, salicylidine-4-iodoaniline and salicylidine-4-nitroaniline, have been synthesized by the reaction of bis(indenyl)zirconium(IV)dichloride and Schiff base (SBH) in 1:1 molar ratio in refluxing THF in the presence of triethylamine.The new derivatives have been characterized on the basis of their elemental analyses, conductance measurements and spectral (IR, 1H-NMR, UV-VIS) studies. - keywords: Bis(indenyl)zirconium(IV) complexes; Schiff base; Conductance; IR; 1H-NMR; UV-VIS
- Sharma, A. K.,Khera, B.,Kaushik, N. K.
-
p. 907 - 914
(2007/10/02)
-
- Study of Uranyl Complexes of Some Schiff Bases
-
Dioxouranium(VI) complexes of some Schiff bases, obtained by condensing chloroanilines and toluidines with salicylaldehyde are synthesised and characterised by elemental analysis, spectral and conductance data.All the complexes are orange red in colour, m
- Prabhu, P. S.,Dodwad, S. S.
-
p. 546 - 549
(2007/10/02)
-
- Polarographic investigations on azomethines: Benzal-p-chloranilines in alkaline medium and effect of substituents on half-wave potentials
-
Polarographic behavior of twenty-four substituted benzal-p-chloranilines has been investigated in 50percent methanol-water medium in alkaline pH range.The experimental conditions for the study were so designed that no appreciable hydrolysis of the Schiff
- Katiyar, Sarvagya S.,Lalithambika, M.
-
p. 961 - 973
(2007/10/02)
-