- 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
-
-
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)
-
- Synthesis, characterization and anti-cancer studies of Mn(II), Cu(II), Zn(II) and Pt(II) dithiocarbamate complexes - crystal structures of the Cu(II) and Pt(II) complexes
-
Mn(II), Cu(II), Zn(II) and Pt(II) complexes of 2-((p-tolylamino)methyl)phenolyldithiocarbamate were synthesized and characterized by elemental analyses and spectroscopic techniques. Spectroscopic studies indicate four coordinate geometry around the metal(
- Ajibade, Peter A.,Fatokun, Amos A.,Andrew, Fartisincha P.
-
-
- 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 of novel Schiff bases using green chemistry techniques; antimicrobial, antioxidant, antiurease activity screening and molecular docking studies
-
Schiff base derivatives were synthesized in this study via conventional, microwave irradiation and ultrasound sonication methods. Optimization conditions were examined for several parameter such as solvent, reaction time and yield. After determining the o
- Mermer, Arif,Demirbas, Neslihan,Uslu, Harun,Demirbas, Ahmet,Ceylan, Sule,Sirin, Yakup
-
p. 412 - 422
(2019/01/21)
-
- 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
-
-
- AIPE-active platinum(ii) complexes with tunable photophysical properties and their application in constructing thermosensitive probes used for intracellular temperature imaging
-
Aggregation-induced phosphorescent emission (AIPE) luminogens based on phosphorescent transition metal complexes have many application advantages in bioimaging compared with fluorescent organic dyes because of their long excitation lifetime and reduced ph
- Lin, Shengheng,Pan, Honghao,Li, Lin,Liao, Rui,Yu, Shengzhen,Zhao, Qiang,Sun, Huibin,Huang, Wei
-
supporting information
p. 7893 - 7899
(2019/07/10)
-
- Copper-Catalyzed Asymmetric Annulation Reactions of Carbenes with 2-Iminyl- or 2-Acyl-Substituted Phenols: Convenient Access to Enantioenriched 2,3-Dihydrobenzofurans
-
We have developed a method for the highly diastereo- and enantioselective construction of 2,3-dihydrobenzofurans bearing tetrasubstituted carbon stereocenters by means of annulation reactions between carbenes and 2-iminyl- or 2-acyl-substituted phenols through catalysis by readily accessible copper(I)/bisoxazoline catalysts under mild conditions. These reactions feature a unique mechanism in which the copper catalyst serves a dual function: first it reacts with the diazo compound to generate a metal carbene, and second, upon formation of an oxonium ylide, it acts as a Lewis acid to activate the imine or ketone for diastereo- and enantioselective cyclization.
- Liang, Xin-Shen,Li, Rui-Dong,Wang, Xiao-Chen
-
supporting information
p. 13885 - 13889
(2019/08/26)
-
- Synthesis, spectroscopic characterization, DFT calculations, and antimicrobial activities of N-arylsalicylaldiminate derivatives of diorganotin(IV)
-
Equimolar reaction of di-n-butyltin(IV) complexes of bidentate Schiff bases of the type [(n-Bu)2Sn(sb)Cl] with sodium salt of mono-functional bidentate ligands in THF-benzene solution afforded structurally interesting complexes of the type [(n-
- Dubey, Raj Kumar,Singh, Avadhesh Pratap,Jaiswal, Nitesh,Singh, Divya Pratap,Meenakshi,Kushwaha, Ajeet Kumar,Kumar, Manoj,Anjum, Afreen
-
p. 3371 - 3384
(2020/01/03)
-
- 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)
-
- PdCl2(Ph3P)2/Salicylaldimine Catalyzed Diarylation of Anilines with Unactivated Aryl Chlorides
-
Triphenylphosphine and salicylaldimine could be used as a mixed ligand system to obtain a high catalytic activity for palladium catalyzed diarylation of primary anilines with unactivated aryl chlorides by the synergistic effect of ligands. The activity and selectivity of the catalytic system could be improved by modifying the structure of salicylaldimine. In refluxing o-xylene, PdCl2(Ph3P)2 with 2,5-ditrifluoromethyl N-phenylsalicylaldimine as a coligand shows high efficiency for the diarylation of various anilines. The catalytic system shows good toleration for the steric hindrance of the substrates. The facile catalytic system works as well on the multiple arylation of 1,1′-biphenyl- 4,4′-diamine with aryl chlorides to afford N,N,N′,N′-tetraaryl-1,1′-biphenyl-4,4′-diamines which are important intermediates of organic light emitting diode (OLED) hole transport materials.
- Tao, Xiaochun,Li, Lei,Zhou, Yu,Qian, Xuanying,Zhao, Min,Cai, Liangzhen,Xie, Xiaomin
-
p. 1749 - 1754
(2017/10/06)
-
- 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)
-
- Abnormal effect of hydroxyl on the longest wavelength maximum in ultraviolet absorption spectra for bis-aryl Schiff bases
-
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
-
-
- Extraction behavior of copper(II) with salicylidene aniline and salicylidene toluidine isomers in chloroform from sulfate medium
-
The solvent extraction of copper(II) from aqueous sulfate solutions was studied using salicylideneaniline and the three isomeric salicylidenetoluidine diluted with chloroform at 25°C. The molecules of these extractants are studied theoretically using ab i
- Almi, Sana,Benakcha, Rachid,Barkat, Djamel
-
p. 274 - 279
(2015/10/12)
-
- Efficient and selective oxidation of alcohols with tert-BuOOH catalyzed by a dioxomolybdenum(VI) Schiff base complex under organic solvent-free conditions
-
The catalytic activity of dioxidobis{2-[(E)-p-tolyliminomethyl]phenolato}molybdenum(VI) complex was studied, for the first time, in the selective oxidation of various primary and secondary alcohols using tert-BuOOH as oxidant under organic solvent-free co
- Hatefi-Ardakani, Mehdi,Saeednia, Samira,Pakdin-Parizi, Zahra,Rafeezadeh, Mahdieh
-
p. 7223 - 7230
(2016/09/19)
-
- Experimental and theoretical study of antioxidative properties of some salicylaldehyde and vanillic Schiff bases
-
The antioxidative capacity and structure-activity relationships of ten Schiff bases were investigated experimentally and theoretically. All compounds contain the aniline moiety, while the aldehyde part is either salicylaldehyde or vanillin. The DPPH assay was used to test the potential antioxidative activity of these compounds, and DFT study was used to investigate their electronic structures and provide insight into their structure-activity relationships. The effect of the position of the hydroxy, as well other groups present, on the antioxidative activity was examined. The possible radical scavenging mechanism was determined in polar (water and methanol), and nonpolar (benzene) solvents. Based on the experimental and computational results, compounds 7 and 8 exhibit the highest radical scavenging properties.
- Petrovi?, Zorica D.,Orovi?, Jelena,Simijonovi?, Du?ica,Petrovi?, Vladimir P.,Markovi?, Zoran
-
p. 24094 - 24100
(2015/03/30)
-
- Synthesis, spectroscopic characterization and DNA cleavage studies of dibutyltin(IV) complexes of bidentate Schiff bases
-
Reactions of di-n-butyltin(IV)dichloride with sodium salts of Schiff bases in tetrahydrofuran-benzene solution in 1:1 and 1:2 stoichiometry afforded complexes of the types [(n-Bu)2Sn(sb)Cl] and [(n-Bu) 2Sn(sb)2], respectiv
- Dubey, Raj Kumar,Singh, Avadhesh Pratap,Patil, Sangamesh A.
-
-
- 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 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)
-
- Telluroxane-supported coordination ligands: Synthetic and structural aspects
-
The reactions of (4-MeOC6H4)2TeO with selected carboxylic acids and phenols afforded the formation of mononuclear organotelluroxanes. The utilization of functional carboxylic acids/phenols, such as 2,2-bis(3,5-dimethylpyra
- Chandrasekhar, Vadapalli,Kumar, Arun,Pandey, Mrituanjay D.,Metre, Ramesh K.
-
supporting information
p. 1362 - 1368
(2013/05/22)
-
- Chitosan: A highly efficient renewable and recoverable bio-polymer catalyst for the expeditious synthesis of α-amino nitriles and imines under mild conditions
-
Commercial chitosan-without any post-modification with active Bronsted or Lewis acid centers-was found to be a highly efficient renewable and recoverable bio-polymer catalyst for the rapid and convenient synthesis of α-amino nitriles or imines from aromatic aldehydes and amines under mild reaction conditions at room temperature in high to quantitative yields. The α-amino nitrile derivatives were prepared through the Strecker reaction using trimethylsilyl cyanide (TMSCN) and catalyzed by chitosan as a heterogeneous bifunctional organocatalyst.
- Dekamin, Mohammad G.,Azimoshan, Mojtaba,Ramezani, Leila
-
supporting information
p. 811 - 820
(2013/04/10)
-
- Synthesis of 3-(4-Methyl-phenyl)-2-phenyl-3,4-dihydro-2H-benzo[e][1,3,2] oxazaphosphinine and Its Chalcogenides
-
A simple method for the synthesis of 3-(4-methyl-phenyl)-2-phenyl-3,4- dihydro-2H-benzo[e][1,3,2]oxazaphosphinine (2) is described. P-Chalcogenides of (2) can be prepared by reacting with S, Se powder in toluene at 110°C. Whereas the tungsten pentacarbony
- Rani, Manju,Shukla, Davender Kumar,Khan, Arif Ali
-
p. 3449 - 3451
(2013/05/09)
-
- 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, antioxidant and antibacterial activities of some Schiff bases containing hydroxyl and methoxy groups
-
A series of Schiff bases were synthesized from different aromatic amines and aromatic aldehydes containing hydroxyl and methoxy groups. These compounds were characterized by IR and 1H NMR. All the compounds were screened for in vitro antioxidant activity using DPPH method and total reducing power activity based on the ability of compounds to reduce the Fe3+-TPTZ complex to the Fe2+/ferrous. Compounds substituted with hydroxyl and other electron donating groups, such as, methoxy groups showed low to high antioxidant activity. In addition, the compounds have been screened for their antibacterial activity against strains of Escherichia coli, Methycillinresistant Staphylococcus aureus, Klebsiella pneumonia and Pseudomonas aeruginosa. The tested Schiff bases at 5 mg/disc showed different antibacterial activities depending on the type of the tested bacterial species. However, E. coli appeared to be sensitive to seven compounds (Ia, Ib, Ic, Id, If, IIb and IIe), while methicillin resistant Staphylococcus aureus (MRSA) was affected by Ic, Ie, IIc and IIe compound. On the other hand, the compounds Ia, Ic, Id, Ie and IIh revealed antibacterial activity against Klebsiella spp. The Pseudomonas aeruginosa was not sensitive to any of the tested Schiff bases.
- Al-Mamary, Mohammed,Abdelwahab, Siddig Ibrahim,Ali, Hapipah Mohd,Ismail, Salma,Abdulla, Mahmood Ameen,Darvish, Pouya
-
experimental part
p. 4335 - 4339
(2012/09/07)
-
- Triorganotin(IV) derivatives of bidentate schiff bases: Synthesis and spectral studies
-
Reaction of tri-n-butyl tin(IV) chloride with the sodium salt of Schiff bases [salicylidene-2-aminopyridine (sapH), salicylidene-2-amino-4-picoline (sapicH), salicylidene-2-methyl-1-aminobenzene (o-smabH), salicylidene-4-methyl- 1-aminobenzene (p-smabH),
- Dubey, Raj Kumar,Singh, Avadhesh Pratap,Dwivedi, Nalini
-
experimental part
p. 1038 - 1045
(2012/07/28)
-
- Triphenylphosphine as a ligand for the Pd-catalyzed amination of unactivated aryl chlorides with anilines promoted by salicylaldimine
-
An efficient and selective amination of unactivated aryl chlorides with anilines catalyzed by mixed ligand Pd catalytic system of Ph3P- salicylaldimine has been developed for the preparation of diarylamines. The benzyne mechanism was ruled out based on experimental results. Georg Thieme Verlag Stuttgart · New York.
- Liu, Tao-Ping,Cheng, Qiang,Song, Wen-Jing,Cai, Liang-Zhen,Tao, Xiao-Chun
-
p. 2333 - 2336
(2013/07/19)
-
- 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)
-
- Novel lithium Schiff-base cluster complexes as electron injectors: Synthesis, crystal structure, thin film characterisation and their performance in OLEDs
-
A set of novel lithium Schiff base cluster compounds has been synthesised and characterised for the first time and tested as electron injectors in OLED devices. Their electrical, electronic, thermal and optical properties have been investigated and compar
- Kathirgamanathan, Poopathy,Surendrakumar, Sivagnanasundram,Antipan-Lara, Juan,Ravichandran, Seenivasagam,Chan,Arkley, Vincent,Ganeshamurugan, Subramanium,Kumaraverl, Muttulingham,Paramswara, Gnanamoly,Partheepan, Arumugam,Reddy, Vanga R.,Bailey, Daniel,Blake, Alexander J.
-
scheme or table
p. 6104 - 6116
(2012/06/29)
-
- Solvent-free addition reaction of allylzinc bromide and aldimines
-
(Chemical Equation Presented) Barbier-type allylation of aldimines with allylzinc bromide took place rapidly under solvent-free conditions. The procedure is environmentally benign and operationally simple, has good regioselectivity, and gives good to exce
- Zhang, Yumei,Han, Minghu,Yan, Tingli
-
body text
p. 2689 - 2693
(2012/07/14)
-
- 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)
-
- 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)
-
- 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
(2011/08/22)
-
- Synthesis and physicochemical characterization of some hexacoordinated tin(IV) Schiff base complexes
-
A freshly distilled tin(IV) tetrachloride interacted with sodium salts of Schiff bases in 1:2 molar ratios in a mixture of tetrahydrofuron (THF)-C 6 H6 produced complexes of the type [SnCl2 (sb) 2 ], [where sb =
- Dubey, Raj Kumar,Singh, Avadhesh Pratap,Dwivedi, Nalini
-
scheme or table
p. 77 - 83
(2012/06/01)
-
- Synthesis, spectroscopic (IR, electronic, FAB-mass, and PXRD), magnetic, and antimicrobial studies of new iron(III) complexes containing Schiff bases and substituted benzoxazole ligands
-
Mixed ligand complexes of iron(III), [Fe(sb)2(py)Cl] 2H 2O (1-9) [where sbH = Schiff bases (derived from condensation of 2-aminopyridine (sapH), 2-aminophenol (saphH), o-toluidine (o-smabH), aminobenzene (sabH), p-toluidine (p-smabH), 3-nitroaniline (snabH), and anthranilic acid (saaH) with salicylaldehyde and substituted (mercapto-)benzimidazole (mbzH), {2-(o-hydroxyphenyl)}benzoxazole, (pboxH)], have been synthesized by the interactions of iron(III) chloride with corresponding ligands in 1 : 2 molar ratio in refluxing pyridine. These complexes have been characterized by elemental analyses, melting points, spectral, and magnetic studies. Powder X-ray diffraction studies of some representative complexes are also reported herein. The antibacterial and antifungal activities of the free ligands and their iron(III) complexes were found invitro. The complexes showed good antibacterial and antifungal effect to some bacteria and fungi. Two standard antibiotics (chloromphenicol and terbinafine) were used for comparison with these complexes.
- Dubey, Raj K.,Dubey, Uma K.,Mishra, Sharad K.
-
experimental part
p. 2292 - 2301
(2012/07/13)
-
- Antileishmanial, antimicrobial and antifungal activities of some new aryl azomethines
-
A series of eighteen azomethines has been synthesized by the reaction of appropriate primary aromatic amines with aryl and/or heteroaryl carboxaldehydes. The synthesized azomethines have been evaluated for their in vitro antileishmanial, antibacterial and antifungal activities. The results revealed some antifungal activity of most of the synthesized compounds, whereas the antileishmaniasis activity results highlighted that all synthesized azomethines inhibited parasite growth and most of them showed highly potent action towards Leishmania major promastigotes. No remarkable bactericidal activities were observed.
- Al-Kahraman, Yasser M.S.A.,Madkour, Hassan M.F.,Ali, Dildar,Yasinzai, Masoom
-
experimental part
p. 660 - 671
(2010/06/16)
-
- 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)
-
- 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)
-
- Solvent-free allylation and benzylation of aldimines mediated by zinc powder
-
A rapid and efficient procedure for allylation and benzylation of aldimines mediated by zinc powder under solvent-free conditions is described. The procedure is operationally simple, higher regioselective, and gives good to excellent yields.
- Zhang, Yumei,Yan, Tingli,Cheng, Wei,Zuo, Jianming,Zhao, Weijie
-
body text
p. 2925 - 2928
(2009/07/19)
-
- Electrochemical investigations of oxovanadium(IV) complexes with bidentate Schiff base ligands in dimethylformamide
-
The electrochemical redox properties of bidentate Schiff base oxovanadium(IV) complexes viz. VO(sal-anl)2 1, VO(sal-tod) 2 2, VO(hmp-and)2 3 and VO(hmp-oxime)2 4 have been studied in DMF/0.1 M TBAP using cyclic
- Prasad, Jagdish,Yadav, Prem,Srivastava, Krishna,Pandeya
-
experimental part
p. 14 - 17
(2010/05/02)
-
- Monocyclopentadienyl phenoxido-amino and phenoxido-amido titanium complexes: Synthesis, characterisation, and reactivity of asymmetric metal centre derivatives
-
Reduction of phenol-imine derivatives R′N=CH(3,5-R2C 6H2-2-OH) (R = tBu; R′ = C6H5 1a, p-MeC6H4 1b, Cy 1c, tBu 1d, 2,6-Me2C 6H3 1e; R = H; R′ = p
- Alesso, Giuseppe,Sanz, Martial,Mosquera, Marta E. G.,Cuenca, Tomas
-
experimental part
p. 4638 - 4649
(2009/03/12)
-
- Synthesis and physicochemical characterization of some Schiff base complexes of chromium(III)
-
Some chromium(III) complexes of the type, [Cr(L)2(H 2O)2]Cl (1-10) [where L = Schiff bases (sbH, derived from the condensation of 2-amino pyridine, 2-aminophenol, o-toluidine, p-toluidine, 3-nitroaniline and anthranilic acid with salicylaldehyde/vanillin) and substituted benzimidazole/ benzoxazole or mercaptobenzimidazole] have been prepared by the reaction of chromium(III) chloride with corresponding ligands followed by immediate addition of ethanolic solution of anhydrous sodium acetate in 1:2 molar ratio. The resulting products have been characterized by elemental analysis, spectral (IR, UV-visible and FAB-mass) as well as magnetic susceptibility measurements. Octahedral structure is proposed for the complexes.
- Dubey,Dubey,Mishra
-
experimental part
p. 1208 - 1212
(2009/03/11)
-
- Synthesis, spectroscopic (IR, electronic and FAB-mass) and magnetic studies of some mixed ligand complexes of chromium (III)
-
Some new mixed ligand complexes of chromium (III) of the type [Cr(L) 2(L1)Cl].2H2O [where LH = Schiff bases (derived from the condensation of 2-aminopyridine, 2-aminophenol, o-toludine, p-toludine, aniline, 3-nitroaniline and anthranilic acid with salicylaldehyde/vanillin and substituted benzimidazole/benzoxazole, or mercaptobenzimidazole; L=pyridine] have been synthesized by the interactions of chromium (III) chloride with corresponding ligand in 1:2 molar ratio in refluxing pyridine solution. The resulting products have been characterized by elemental analysis and spectral as well as magnetic susceptibility measurements. Structures of the chromium (III) complexes are also proposed.
- Dubey,Dubey,Mishra
-
p. 1638 - 1642
(2007/10/03)
-
- Reductive amination of aldehydes and ketones with sodium borohydride supported onto HZSM-5 zeolite under microwave irradiation in a solvent free system
-
Sodium borohydride supported onto a HZSM-5 zeolite is presented as a general reducing agent for the reductive amination of aldehydes and ketones under microwave irradiation in solventless system. Copyright Taylor & Francis Inc.
- Oskooie, Hossein A.,Amiri, Somaih Solemani,Heravi, Majid M.,Ghassemzadeh, Mitra
-
p. 2047 - 2050
(2007/10/03)
-
- 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)
-
- A study of the tautomers of N-salicylidene-p-X-aniline compounds in methanol
-
We have studied the enol-imine→keto-amine tautomeric equilibrium of N-salicylidene-p-X-aniline compounds with X = Me, OMe, NMe2 as electron donor substituents and X = COMe, CN and NO2 as electron acceptor substituents. The equilibrium constants (Ktauo) and standard thermodynamic properties ΔGtauo, ΔHtauo and ΔStauo were measured and calculated in methanol solution at various temperatures, by means of excitation fluorescence spectroscopy. We have analyzed the p-phenylaniline substitution effect on Ktauo and the thermodynamic properties through the Hammett parameters σ. We have performed molecular orbital calculations at the semiempirical AM1 and ab initio HF/3-21G levels to interpret the experimental results, explicitly including the solute-solvent interaction through the formation of an intermolecular hydrogen bond between the salicylidene and methanol molecules. These computational results show a good correlation with the experimental values. An interpretation of the experimental values of TΔSo, based on changes in the molecular structure produced in the enol-imine→keto-amine tautomeric reaction, is proposed.
- Vargas,Amigo
-
p. 1124 - 1129
(2007/10/03)
-