- Synthesis, identification, biological activity and anti-cancer activity Studies of Hetrocyclic Ligand Azo-schiff Base with Au(III) Complex
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This research involved preparation of 2-((E)-(1H-benzo.[d]imidazol-2-yl).diazenyl)-4-(((4-bromophenyl)imino)methyl)phenol and Au(III) complex which was prepared by mixing solution of metal salt with ligand solution at mole ratio[ M:L] 1:1 . Compounds prep
- Hessoon, Haider M.,Karam, Faiq F.
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p. 327 - 334
(2022/01/22)
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- A novel water-dispersible and magnetically recyclable nickel nanoparticles for the one-pot reduction-Schiff base condensation of nitroarenes in pure water
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In this work, a heterogeneous nanocatalyst called Ni-Fe3O4@Pectin~PPA ~ Piconal was first synthesized, which was investigated as a bifunctional catalyst containing nickel functional groups. On the other hand, this Ni-Fe3O4@Pectin~PPA ~ Piconal catalyst in aqueous solvents shows a very effective performance at ambient temperature for the nitroarene reduction reaction with sodium borohydride, for which NaBH4 is considered as a reducing agent. This is a novelty magnetic catalyst that was approved by various methods, including Fourier-transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), Dynamic light scattering (DLS), Transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), Inductively coupled plasma (ICP), Energy-dispersive X-ray spectroscopy (EDX), and Field emission scanning electron microscopy (FESEM) analyses. From the satisfactory results obtained from the reduction of nitrogen, this catalytic system is used for a one-pot protocol containing a reduction-Schiff base concentration of diverse nitroarenes. It was corroborated with the heterogeneous catalytic experiments on the one-pot tandem synthesis of imines from nitroarenes and aldehydes. Finally, the novel Ni-Fe3O4@Pectin~PPA ~ Piconal catalyst could function as a more economically desirable and environmentally amicable in the catalysis field. The favorable products are acquired in good to high performance in the attendance of Ni-Fe3O4@Pectin~PPA ~ Piconal as a bifunctional catalyst. This catalyst can be recycled up to six steps without losing a sharp drop.
- Ghamari Kargar, Pouya,Ravanjamjah, Asiye,Bagherzade, Ghodsieh
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p. 1916 - 1933
(2021/07/10)
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- Simple synthesis of the novel Cu-MOF catalysts for the selective alcohol oxidation and the oxidative cross-coupling of amines and alcohols
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A novel porous metal–organic framework {Cu2(bbda)0.5(Hbbda)1.5(OAc)1.5.8H2O} (UoB-5) was synthesized under ultrasound irradiation by employing a new Schiff base ligand H2bbda (4,4'(1,4-phenylene bis (azanylylidene)) bis (methanylylidene))dibenzoic acid) and was fully characterized. The microporous nature of UoB-5 was confirmed by gas-sorption measurements. This framework acted as a highly effective heterogeneous catalyst for the alcohol oxidation reaction with tert-butyl hydroperoxide (t-BuOOH) as an oxidant. The presence of coordinatively unsaturated metal sites in UoB-5 could be the reason for high performance in this reaction. Furthermore, using the long linker with the free -NC group and uncoordinated -N atom on the wall of the pores created UoB-5 an excellent candidate for the catalytic activities without activation of the framework. It was confirmed with the heterogeneous catalytic experiments on the one-pot tandem synthesis of imines from benzyl alcohols and anilines. Eventually, the new Cu-MOF (UoB-5) could be an alternative catalyst as a more economically favorable and environmentally friendly in the catalysis field.
- Ghamari Kargar, Pouya,Aryanejad, Sima,Bagherzade, Ghodsieh
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- Additional effect of para-hydroxyl on the reduction potentials of the N-benzylidenebenzenamines
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The reduction potential ERed of disubstituted N-benzylidenebenzenamines XArCH NArY (abbreviated as XBAY) is a measure of the electron acceptance ability of the Lowest-energy Unoccupied Molecular Orbital (LUMO) in molecule, which is closely related to the electronic effects of substituents X and Y in molecule. Previous studies on the ERed of XBAY reported by Luo, Wang, and Yuan all did not involve these molecules containing hydroxyl. In this work, 28 samples of disubstituted N-benzylidenebenzenamines containing para-hydroxyl, (abbreviated as 4-OHBAY or XBAOH-4′) were synthesized, and their ERed values were measured. Then, 127 compounds were taken as a complicated ERed data set, which involved 28 compounds (4-OHBAY and XBAOH-4′) of this work and 99 compounds XBAY reported by Luo. Based on these data ERed set, through a quantitative regression analysis method and comparison of the factors affecting the ERed, the following results are obtained: (a) Because the phenolic hydroxyl OH can dissociate H+ to form phenolic oxygen anion, the change regularity of ERed of compounds 4-OHBAY and XBAOH-4′ is somewhat different from that of ERed of XBAY compounds without hydroxyl OH. That is, hydroxyl OH has an additional effect on the ERed, which decreases the ERed value. (b) The additional effects of 4-OH on the ERed is different from that of 4′-OH. The effect of hydroxyl OH attached to the aldehyde aromatic ring on the ERed is more than that of OH attached to the amine aromatic ring.
- Cao, Chao-Tun,Zhou, Wei,Cao, Chenzhong
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- Effect of substituents on the UV spectra of supermolecular system: Silver nanoparticles with bi-aryl Schiff bases containing hydroxyl
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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
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- Abnormal effect of hydroxyl on the longest wavelength maximum in ultraviolet absorption spectra for bis-aryl Schiff bases
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Two sets of bis-aryl Schiff bases that contain 4(or 4′)-OH and 2(or 2′)-OH were synthesized. The first set consists of 4-HOArCH=NArY and XArCH=NArOH-4′, and the second set consists of 2-HOArCH=NArY and XArCH=NArOH-2′. Their ultraviolet absorption spectra were measured and investigated. A very interesting phenomenon was observed by analyzing their wave number νmax (cm?1) of longest wavelength maximum λmax (nm) of ultraviolet. Compared with the change regularity of the νmax of XArCH=NArY (where the X and Y excluded OH), the 4′-position hydroxyl (4′-OH) and 2′-position hydroxyl (2′-OH) have abnormal performance. The details are the following: the 4′-OH contributes an additional red shift to the νmax of XArCH=NArOH-4′ (λmax increase), whereas the 2′-OH contributes an additional blue shift to the νmax of XArCH=NArOH-2′ (λmax decrease). In addition, there are ortho steric effects of all 2-OH and 2′-OH on the νmax for 2-HOArCH=NArY and XArCH=NArOH-2′, and the ortho steric effect contributes a red shift to their νmax. These experimental facts can provide an important theoretical reference for us using aryl Schiff base compounds as optical materials and performing the molecular design.
- Cao, Chao-Tun,Zhou, Wei,Cao, Chenzhong
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- Non-symmetric chiral liquid crystal dimers. Preparation and characterisation of the (S)-(benzylidene-4′-substitutedaniline)-2″-methylbutyl-4?(4″″-phenyloxy)-benzoateoxy)hexanoates
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The properties of six chiral non-symmetric dimers belonging to the family of (S)-(benzylidene-4′-substitutedaniline)-2″-methylbutyl-4?(4″″-phenyloxy)benzoate-oxy)hexanoates are described. The terminal substituents on the 4-benzylidene-4′-substituted fragm
- Yeap, Guan-Yeow,Osman, Faridah,Imrie, Corrie T.
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p. 118 - 125
(2016/02/12)
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- Molecular structure-thermal behaviour relationship of dimers consisting of different terminal substituents and sulphur-sulphur linking group
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A new series of dimers 6-(4-oxybenzylidine-4′-substituted-aniline)hexyldisulphides containing various terminal substituents (CH3, C2H5, Cl and Br) have been synthesized. The correlation between the molecular structure and
- Yeap, Guan-Yeow,Osman, Faridah,Kamil Mahmood, Wan Ahmad,Takeuchi, Daisuke
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p. 666 - 672
(2016/02/03)
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- Symmetrical trimeric star-shaped mesogens based on 1,3,5-trisubstituted benzene incorporating Schiff base and azobenzene fragments as the peripheral units: Synthesis and mesomorphic properties
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Two series of symmetrical three-armed star-shaped mesogens based on 1,3,5-trihydroxybenzene as a core unit, interconnecting three Schiff base or azobenzene moieties via oxymethylene spacers have been synthesized and characterized by spectroscopic techniqu
- Yeap, Guan-Yeow,Ooi, Yew-Hong,Uchida, Nozomi,Ito, Masato M.
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p. 847 - 859
(2014/07/07)
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- Solvent-free synthesis, spectral correlations and antimicrobial activities of some aryl imines
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A series of aryl imines have been synthesized by Fly-ash: H 2SO4 catalyzed microwave assisted process under solvent-free conditions. The yields of the imines have been found to be more than 87%. The purity of all imines has been checked using their physical constants and spectral data as published earlier in literature. The UV λmaxCN(nm), infrared νCN(cm-1), NMR δ(ppm) of CH and CN spectral data have been correlated with Hammett substituent constants and F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituents on the above spectral data has been studied. The antimicrobial activities of All synthesised imines have been studied using Bauer-Kirby method.
- Suresh,Kamalakkannan,Ranganathan,Arulkumaran,Sundararajan,Sakthinathan,Vijayakumar,Sathiyamoorthi,Mala,Vanangamudi,Thirumurthy,Mayavel,Thirunarayanan
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p. 239 - 248
(2013/02/22)
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- Mesomorphic behaviour of new azomethine liquid crystals having terminal bromo substituent
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A homologous series of azomethine esters, 4-n-alkanoyloxybenzylidene- 4′-bromoanilines possessing even number of carbon atoms at the terminal alkanoyloxy chain (Cn-1H2n-1COO-, n = 8, 10, 12, 14, 16, 18) was synthesized and characteri
- Ha, Sie Tiong,Lee, Teck Leong,Lee, Siew Ling,Yeap, Guan Yeow,Win, Yip Foo,Ong, Siew Teng
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scheme or table
p. 177 - 180
(2012/06/18)
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- Mesogenic schiff base with bromo end group: Synthesis and thermotropic properties
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A new homologous series of Schiff base esters comprising a terminal bromo substituent was studied. The bromo substituent contributes to the molecular polarizability, thus, affecting intermolecular interactions, hence, resulting in smectic polymorphism. Th
- Ha, Sie-Tiong,Lee, Teck-Leong,Lin, Hong-Cheu,Ito, Masato M.,Abe, Kazuma,Kubo, Kenji,Sastry, S. Sreehari
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experimental part
p. 3679 - 3684
(2012/07/28)
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- Synthesis and antitubercular activity of some 2-(4-substituted phenyl)-3-(4-substituted phenyl)-5-methylthiazolidin-4-ones
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The compounds 2-(4-substituted phenyl)-3-(4-substituted phenyl)-5-methylthiazolidin-4-ones were synthesized by condensing 4-substituted anilines with 4-substituted benzaldehydes by using ethanol as solvent. The synthesized compounds were heated with 2-mercaptopropionic acid in excess of benzene. The chemical nature of synthesized compounds have been confirmed by means of IR, NMR and mass data. The synthesized compounds were screened for antitubercular activity. The compounds were subjected to in vitro screening by the tube dilution technique employing the human virulent H37R V strain of M. tuberculosis using isoniazid as a reference standard. The results revealed that the test compounds IIa, IIc, IId, IIe, exhibits remarkable antitubercular activity against H37RV strain of Mycobacterium tuberculosis. The minimum inhibitory concentration (MIC) values were found in the range of 25 to 42 μg/mL.
- Patil, Sunila T.,Bhatt, Parloop A.
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experimental part
p. 1405 - 1406
(2011/12/16)
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- GREEN SYNTHESIS OF ARYL ALDIMINES USING ETHYL LACTATE
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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.
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Page/Page column 5-6
(2011/08/22)
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- Synthesis and fungitoxicity of aldimines and 4-thiazolidinones derived from 4-bromoaniline
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Condensation of 4-bromoaniline with benzaldehyde and substituted benzaldehydes (1-8) in equimolar ratio resulted in the formation of benzal-4-bromoaniline and its C-phenyl derivatives (1a-8a). Addition of thioglycolic acid to 1a-8a yielded the respective
- Sandhar, Randeep Kaur,Sharma,Manrao
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experimental part
p. 220 - 223
(2009/05/26)
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- Novel nonsymmetric trimeric liquid crystals exhibiting glassy nematic state at low temperatures
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Series of nonsymmetric 4-ethyl- and 4-fluoroanilinebenzylidene-2',4'-oxy- bis(4''-halogenoanilinebenzylidene-4'''oxy)alkanes trimers have been synthesized and characterized. Every member in this series possesses either Cl or Br terminal atoms. The molecul
- Yeap, Guan-Yeow,Hng, Tiang-Chuan,Mahmood, Wan Ahmad Kamil,Gorecka, Ewa,Takeuchi, Daisuke,Osakada, Kohtaro
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experimental part
p. 135 - 152
(2010/03/24)
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- Quantitative solid-solid synthesis of azomethines
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Twenty preparatively useful azomethines have been quantitatively (100% yield at 100% conversion) obtained as hydrates by grinding together solid anilines with solid benzaldehydes without passing through liquid phases. Unlike (acid catalyzed) azomethine syntheses in solution, the solid-solid condensations proceed 'waste-free'. The solid-state mechanisms have been elucidated by atomic force microscopy (AFM) and in part by scanning near-field optical microscopy (SNOM) in three cases. The results indicate long distance migration of the aldehydes into the lattice of the aniline derivatives. Stumpy protrusions are formed at the direct points of contact but also distance sublimation (100 nm range) is succesful in the case of p-chlorobenzaldehyde and p-nitroaniline. Long-range flow of 4-hydroxybenzaldehyde molecules on its (010)-face into contracting crystals of p-toluidine or p-anisidine occurs along two different cleavage planes. Steep hills and valleys are left behind. The molecular migrations through the sites of contact are interpreted in terms of crystals packing. The ease of these solid-solid condensation reactions relies on the crystal packing.
- Schmeyers, Jens,Toda, Fumio,Boy, Juergen,Kaupp, Gerd
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p. 989 - 993
(2007/10/03)
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