- The functionalization of magnetite nanoparticles by hydroxyl substituted diazacrown ether, able to mimic natural siderophores, and investigation of their antimicrobial activity
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In this work we report of functionalization of magnetite nanoparticles by hydroxyl containing diazacrown ether—macroheterocycle (MC) that is able to mimic the properties of natural siderophores. The structure of synthesized crown ether was investigated by
- Hasanova, Ulviyya Alimammad,Ramazanov, Mahammadali Ahmad,Maharramov, Abel Mammadali,Gakhramanova, Zarema,Hajiyeva, Sarvinaz Faiq,Vezirova, Leyla,Eyvazova, Goncha Malik,Hajiyeva, Flora Vidadi,Huseynova, Parvana,Agamaliyev, Zohrab
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- Phosphorus-nitrogen compounds. Part 29. Syntheses, crystal structures, spectroscopic and stereogenic properties, electrochemical investigations, antituberculosis, antimicrobial and cytotoxic activities and DNA interactions of ansa-spiro-ansa cyclotetrapho
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A number of novel ansa-spiro-ansa (asa) cyclotetraphosphazenes (1a-5b) was prepared in the range of 63-90 % yields. The structures of the compounds were verified by MS, FTIR, 1H, 13C{1H} and 31P{1H} N
- Elmas, Gamze,Okumu?, Aytu?,Ko?, L.Yasemin,Soltanzade, Hossien,Kílí?, Zeynel,H?kelek, Tuncer,Dal, Hakan,A?ík, Leyla,üstünda?, Zafer,Dündar, Devrim,Yavuz, Makbule
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- Tuning the Equatorial Crystal-Field in Mononuclear DyIIIComplexes to Improve Single-Molecule Magnetic Properties
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Two DyIII complexes, [Dy(bbpen-F)X] [X = Cl (1), Br (2); H2bbpen-F = N,N′-bis(2-hydroxybenzyl)-N,N′-bis(5-fluoro-2-methylpyridyl)ethylenediamine], have been synthesized that show remarkable single-molecule-magnet behavior with effective barriers of magnet
- Zhu, Li,Yin, Bing,Ma, Pengtao,Li, Dongfeng
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- Coordinating ligand functionalized AgNPs for colorimetric sensing: Effect of subtle structural and conformational change of ligand on the selectivity
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Metal coordinating C2-symmetric phenolic chelating ligands (1-3) were used to prepare surface functionalized AgNPs for selective colorimetric sensing of metal cations and anions. The effect of subtle structural and conformational change of 1-3
- Vinod Kumar,Philip Anthony, Savarimuthu
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- Syntheses, spectroscopic properties, crystal structures, biological activities, and DNA interactions of heterocyclic amine substituted spiro-ansa-spiro- and spiro-bino-spiro-phosphazenes
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The heterocyclic amine e.g. pyrrolidine, piperidine, morpholine and 1, 4-dioxa-8-azaspiro[4, 5]decane (DASD) substituted spiro-ansa-spiro (sas) 5a-5d and spiro-bino-spiro (sbs) 6a-6d phosphazenes were prepared by the replacement reactions of the Cl-atoms
- Ko?ak, Selen Bilge,Ko?o?lu, Serhat,Okumus, Aytu?,Kili?, Zeynel,?ztürk, Asli,H?kelek, Tuncer,?ner, Ya?mur,A?ik, Leyla
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- Fluorescent and chromogenic receptor bearing amine and hydroxyl functionality for iron (III) detection in aqueous solution
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The noncyclic 2,2′-[ethane-1,2-diylbis (iminomethanediyl)]diphenol (4) fluorescent receptor bearing two amine and hydroxyl groups have been designed and investigated for their binding properties towards various cations. The fluorescent spectral measuremen
- Fegade, Umesh,Tayade, Shivaji,Chaitanya, G. Krishna,Attarde, Sanjay,Kuwar, Anil
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- Structure, photochemistry and magnetic properties of tetrahydrogenated Schiff base chromium(III) complexes
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Four mononuclear chromium(III) complexes [Cr(L(1))(en)]Br0.3Cl0.7 (1), [Cr(L(1))(pr)]Cl (2), [Cr(L(2))(en)]ClO4 (3), [Cr(L(2))(pr)]Cl (4) along with one dinuclear μ-methoxo [Cr(μ-OMe)(L1)]2 (5) were synthesized (en = 1,2-ethanediamine, pr = 1,3-diaminopropane H2L(1) = Tetrahydrosalen = H2[H4]salen = N,N′-bis(2-hydroxybenzyl)-1,2-ethanediamine, H2L(2) = Tetrahydrosalpr = H2[H4]salpr = N,N′-bis(2-hydroxybenzyl)-1,3-diaminopropane). The competitive reactions in the presence of EDTA were carried out and the first-order rate constants k(1) = (5.2 ± 0.2) × 10-3 h-1 -3 h-1 -3 h-1 -3 h-1 were obtained by spectroscopic measurements. In addition, photo-induced decomposition was monitored under irradiation of xenon lamp. The sequence of first-order rate constants is k′(1) = (4 ± 0.1) × 10-4 s-1 -4 s-1 -3 s-1 -3 s-1, which is in accordance with that of kinetics studies with EDTA. Dinuclear complex 5 exhibits a strong antiferromagnetic coupling with the J = -10.8 cm-1.
- Liu, Bin,Chai, Jie,Feng, Sisi,Yang, Binsheng
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- Specific Design of Titanium(IV) Phenolato Chelates Yields Stable and Accessible, Effective and Selective Anticancer Agents
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Octahedral titanium(IV) complexes of phenolato hexadentate ligands were developed and showed very high stability for days in water solutions. In vitro cytotoxicity studies showed that, whereas tetrakis(phenolato) systems are generally of low activity pres
- Meker, Sigalit,Braitbard, Ori,Hall, Matthew D.,Hochman, Jacob,Tshuva, Edit Y.
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- Application of zeolite-encapsulated Cu(ii) [H4]salen derived from [H2]salen in oxidative delignification of pulp
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Since the disclosure that salen complexes were potent low-temperature oxidation catalysts with exceptional selectivity, considerable efforts by our group have focussed on their development towards the efficient catalytic delignification of pulp, principal
- Zhou, Xue-Fei
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- H4HBEDpa: Octadentate Chelate after A. E. Martell
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H4HBEDpa, a new octadentate chelator inspired by the 1960s ligand HBED of Arthur E. Martell, has been investigated for a selection of trivalent metal ions useful in diagnostic and therapeutic applications (Sc3+, Fe3+, Ga3+, In3+, and Lu3+). Complex format
- Choudhary, Neha,De Guadalupe Jaraquemada-Peláez, María,Orvig, Chris,Patrick, Brian O.,Scheiber, Hayden,Zhang, Jiale
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p. 12855 - 12869
(2021/09/11)
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- Syntheses, X-ray single crystal structures and biological activities of cobalt(III) complexes with reduced Schiff base ligands
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A new mononuclear cobalt(III) complex, [Co(HL1)2]Cl (1), derived from the reduced Schiff base 2,2'-((ethane-1,2-diyl-bis(azanediyl))bis(methylene))diphenol (H2L1), and a new dinuclear cobalt(III) complex, [Co2(L2)2] ? 2H2O (2), derived from the reduced Schiff base 6,6'-(2-hydroxypropane-1,3-diyl)bis(azanediyl)bis(methylene)bis(2-bromo-4-chlorophe-nol) (H2L2), were synthesized and characterized by infrared and electronic spectroscopy, and single crystal X-ray diffraction techniques. The ligands were synthesized first, and then bound to the Co(III) centre. Compound 1 contains a mononuclear [Co(HL1)2]+ cation and a chloride anion. The cationic moiety possesses crystallographic inversion center symmetry. Compound 2 contains a dinuclear [Co2(L2)2] molecule and two water hydrate molecules. The Co atoms in the complexes are in octahedral coordination. Both complexes showed potential antimicrobial activity.
- Han, Yong-Jun,Liu, Qiao-Ru,Luo, Xiao-Qiang,Xue, Ling-Wei
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p. 159 - 166
(2020/03/30)
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- Synthesis and antibacterial studies of some reduced schiff base derivatives
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A series of N,N-substituted ethylene-1,2-diamine derivatives have been prepared from reaction of 2-hydroxybenzaldehyde derivatives and 1,2-diamine derivatives in the presence of NaBH4 through Schiff base intermediate. The synthesized compounds were screened for their antibacterial activities. Compound SB01, SB02 and SB09 displayed significant activity at MIC ranges from 0.40-6.25 μg/mL.
- Patil, Udaysinha,Khan, Asif,Nagarsekar, Aarti,Mandewale, Mustapha,Yamgar, Ramesh
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p. 2796 - 2805
(2019/01/05)
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- H-bond assisted coordination bond formation in the 1D chains based on azido and phenoxido bridged tetranuclear Cu(II) complexes with reduced Schiff base ligands
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Two new 1D chains [(CuL1R)2Cu2(N3)2(μ1,1,3-N3)2]n (1) and [{(CuL2R)2Cu2(N3)2(μ1,1,3-N3)2}·(CH3)2CO]n (2) based on rare μ1,1,3-N3 bridged tetranuclear Cu(II) complexes, have been synthesized using [CuL1R] and [CuL2R] as “metalloligands” [where H2L1R = N,N′-bis(2-hydroxybenzyl)-1,3-propanediamine and H2L2R = N,N′-bis(2-hydroxybenzyl)-1,2-ethylenediamine]. Both complexes have been characterized by elemental analysis, spectroscopic methods, single crystal XRD, and magnetic study. In case of chain 1, the basic building block is a centrosymmetric tetranuclear unit whereas for 2, it is an asymmetric tetranuclear unit containing two types of square pyramidal Cu(II) centers (terminal and central). The μ1,1-N3 bridged central copper atoms of one tetranuclear unit are connected weakly to the axial position of the terminal copper atoms of neibouring units via the azide ions forming a rare μ1,1,3-N3 bridged novel 1D polymeric chain structure. Variable temperature magnetic susceptibility measurements show the presence of an overall strong antiferromagnetic exchange interactions mediated through the double phenoxido bridges with J values of ?123.8 and ?144.6 cm?1 for 1 and 2, respectively.
- Hazari, Alokesh,Diaz, Carmen,Ghosh, Ashutosh
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- Tetrahydrosalen Uranyl(VI) Complexes: Crystal Structures and Solution Binding Study
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A pair of uranyl complexes incorporating tetrahydrosalen and N,N-dimethyltetrahydrosalen ligands are synthesized and studied. These new ligands, with saturated secondary and tertiary amines, exhibit higher chemostability than the prototype Schiff base (sa
- Zhao, Xiao,Zhang, Di,Yu, Ren,Chen, Shusen,Zhao, Dahui
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supporting information
p. 1185 - 1191
(2018/03/22)
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- HYDROGENATION METHOD AND MANUFACTURING METHOD OF ORGANIC COMPOUND
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PROBLEM TO BE SOLVED: To provide a hydrogenation method having no need for separation of a catalyst after a hydrogenation reaction and capable of recycling the catalyst. SOLUTION: There is provided a hydrogenation method to an organic compound having a nitrogen with multiple bonds as a reaction point. The hydrogenation method has a process for adding a hydrogen atom to a nitrogen atom of an organic compound by a hydrogen supply module. The hydrogen supply module has a hydrogen separation layer containing a hydrogen separation metal selectively passing hydrogen from a hydrogen-containing gas. In the process for adding the hydrogen atom, hydrogen is supplied to the organic compound via a hydrogen separation layer. SELECTED DRAWING: Figure 1 COPYRIGHT: (C)2018,JPO&INPIT
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Paragraph 0069; 0070
(2018/10/19)
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- Dioxovanadium(V) complexes of Schiff and tetrahydro-Schiff bases encapsulated in zeolite-Y for the aerobic oxidation of styrene
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A series of dioxovanadium(V) complexes of Schiff and tetrahydro-Schiff bases were encapsulated into the supercages of zeolite-Y and were characterized by X-ray diffraction, SEM, N2 adsorption/desorption, FT-IR, UV-vis spectroscopy, ICPAES, pair distribution function (PDF) and X-ray absorption near edge structure (XANES) measurements. The encapsulation is achieved by a flexible ligand method in which the transition metal cations were first ion-exchanged into zeolite-Y and then complexed with ligands. The dioxovanadium-exchanged zeolite, dioxovanadium complexes encapsulated in zeolite-Y plus non-encapsulated homogeneous counterparts were all screened as catalysts for the aerobic oxidation of styrene under mild conditions. It was found that the encapsulated complexes showed better activity than their respective nonencapsulated counterparts in most cases. All encapsulated dioxovanadium tetrahydro-Schiff base complexes showed much higher activity in aerobic oxidation of styrene than their corresponding Schiff base complexes.
- Ding, Zhongzhen,Yang, Ying
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p. 290 - 299
(2017/07/25)
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- Pd-tetrahydrosalan-type complexes as catalysts for sonogashira couplings in water: Efficient greening of the procedure
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New sulfonated tetrahydrosalen-type ligands and their water-soluble palladium(II) complexes have been synthesized. The palladium(II) complexes catalyze the Sonogashira coupling (23 examples) of various aryl halides (including chloroarenes) with terminal alkynes, with good to excellent conversions under mild conditions (80 °C, air, no CuI cocatalyst) in aqueous-organic mixtures and turnover frequencies of up to 2790 h -1. Under optimized reaction conditions to minimize environmental contamination, diphenylacetylenes can be isolated in 76-98 % yield. The aqueous catalyst solution can be recycled four times with decreasing activity; however, yields between 93 and 98 % can still be achieved with extended reaction times. Several water-insoluble products can be isolated in excellent yield by simple filtration and purification by washing with water; this method is used, for the first time, for this type of C - C coupling procedure.
- Voronova, Krisztina,Homolya, Levente,Udvardy, Antal,Benyei, Attila C.,Joo, Ferenc
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p. 2230 - 2239
(2014/10/15)
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- Synthesis, spectral characterization and X-ray crystal structure of Fe(III) and Co(III) complexes with an acyclic Schiff base ligand
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Two complexes of composition [Co(HL)2]'ClO4·CH 3OH (1) and [Fe2L3]·0.38H2O (2) (H2L = 2-((2-(2-hydrox-ybenzylamino)ethylamino)methyl)phenol) have been synthesized and their structures have been characterized. The mononuclear cobalt complex 1 shows the metal ion Co(III) in an octahedral environment, being coordinated to two ligand molecules in a N4O2 core, remaining one of the two hydroxyl phenol groups of each ligand not deprotonated and uncoordinated. Instead, complex 2 is dinuclear, and each of the two metal centers is coordinated by one molecule ligand and other ligand molecule acts as bridge between the two metal centers, resulting a distorted N4O2 octahedral environment for each Fe(III) ion. In this case the two hydroxyl phenol groups of the ligand molecules are deprotonated and coordinated. Variable-temperature solid-state magnetic studies have been performed for compound 2.
- Sow, Mouhamadou Moustapha,Diouf, Ousmane,Gaye, Mohamed,Sall, Abdou Salam,Pérez-Lourido, Paulo,Valencia-Matarranz, Laura,Castro, Goretti,Caneschi, Andrea,Sorace, Lorenzo
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p. 171 - 175
(2013/10/22)
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- Hydrogenation and redox isomerization of allylic alcohols catalyzed by a new water-soluble Pd-tetrahydrosalen complex
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For applications in aqueous media, sulfonated tetrahydrosalen (sulfosalan, HSS) was synthesized by sulfonation of tetrahydrosalen in fuming sulfuric acid. The Pd(II) complex of this ligand, [Pd(HSS)], showed outstanding activity in hydrogenation and redox isomerization of allylic alcohols in homogeneous aqueous solutions or in aqueous-organic biphasic systems (for oct-1-en-3-ol TOF(hydrogenation) = 1580 h-1, TOF(redox isomerization) = 400 h -1). DFT calculations revealed that H2 is activated heterolytically, resulting in a Pd(II)-hydride complex, [Pd(H)(HSS-Hphen)], in which one of the phenolate oxygens is protonated. Both hydrogenation and redox isomerization take place via concerted transfer of a proton and a hydride from the hydrogenated catalyst to the allylic alcohol.
- Voronova, Krisztina,Purgel, Mihaly,Udvardy, Antal,Benyei, Attila C.,Katho, Agnes,Joo, Ferenc
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p. 4391 - 4401
(2013/09/02)
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- Salen and tetrahydrosalen derivatives act as effective inhibitors of the tumor-associated carbonic anhydrase XII - A new scaffold for designing isoform-selective inhibitors
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Salen and tetrahydrosalen derivatives possess metal-chelating properties and have been used as ligands in organic synthesis and as scaffolds for developing therapeutic agents. Fourteen such compounds were synthesized in order to explore their ability to inhibit the zinc enzyme carbonic anhydrase (CA, EC 4.2.1.1). Human (h) isoforms hCA I, hCA II, hCA IX and hCA XII were included in the investigation. Several aliphatic and aromatic spacers were introduced between the two chelating groups from salen/tetrahydrosalen in order to explore a diverse chemical space for designing CA inhibitors, which incorporate both phenol and polyamine fragments in their molecule. Some of these compounds showed CA inhibitory activity in the low micromolar-nanomolar range and a pronounced selectivity for inhibiting an isoform over-expressed in hypoxic tumors, hCA XII, over hCA I, II and IX.
- Carradori, Simone,De Monte, Celeste,D'Ascenzio, Melissa,Secci, Daniela,Celik, Gulsah,Ceruso, Mariangela,Vullo, Daniela,Scozzafava, Andrea,Supuran, Claudiu T.
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p. 6759 - 6763
(2014/01/06)
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- FBXO3 INHIBITORS
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The present application discloses benzathine and related compounds and their use as FBXO-3 inhibitors.
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- Methyltrioxorhenium-catalyzed oxidation of pseudocumene for vitamin e synthesis: A study of solvent and ligand effects
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Vitamin E is an essential food component of major economical relevance with important antioxidant properties and biological activity. The oxidation of pseudocumene to trimethyl-1,4-benzoquinone would be a key transformation in an alternative industrial production of α-tocopherol that is important for the antioxidant activity of vitamin E. The methyltrioxorhenium (MTO)-catalyzed oxidation of pseudocumene has been revisited to offer a more environmentally friendly, economically beneficial and milder approach to this important industrial product. It has been observed that by choosing the solvent and Lewis base additives (as ligands of MTO), both yield and chemoselectivity are considerably improved, allowing milder reaction conditions compared to previously reported protocols.
- Carril, Monica,Altmann, Philipp,Drees, Markus,Bonrath, Werner,Netscher, Thomas,Schuetz, Jan,Kuehn, Fritz E.
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experimental part
p. 55 - 67
(2011/11/30)
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- Fluorescent sensors based on 2-substituted imidazolidines
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A number of 2-substituted imidazolidines were synthesized from N,N'-dibenzylethane-1,2-diamine derivatives and benzaldehyde, naphthalene-1-carbaldehyde, 2-hydroxynaphthalene-1-carbaldehyde, and anthra-cene-9-carbaldehyde. Examination of the obtained compounds by spectral methods revealed selective sensor properties of 2-(anthracen-9-yl)-1,3- dibenzylimidazolidine and 2-(anthracen-9-yl)-1,3-bis(2-hydroxybenzyl)- imidazolidine for Hg2+ and Cu2+ ions. Pleiades Publishing, Ltd., 2010.
- Tolpygin,Shepelenko,Revinskii,Tsukanov,Dubonosov,Bren,Minkin
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scheme or table
p. 1181 - 1184
(2011/01/04)
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- Synthesis and antimicrobial activity of N,N′-bis(2-hydroxylbenzyl)-1, 2-ethanediamine derivatives
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A series of N,N′-Bis(2-hydroxylbenzyl)-1,2-ethanediamine derivatives and its schiff bases were synthesized, characterized and screened for in vitro antimicrobial activity against Staphylococcus aureus, Pseudomonas aeruginosa and Salmonella enterica. Resul
- Musa, Musiliyu A.,Khan, M. Omar F.,Aspedon, Arden,Cooperwood, John S.
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experimental part
p. 165 - 170
(2011/02/23)
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- Electronic effects in oxo transfer reactions catalysed by salan molybdenum(VI) cis-dioxo complexes
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A series of molybdenum(vi) cis-dioxo complexes containing tetradentate salan ligands with different para-substitutions on the phenoxy group have been prepared. These complexes catalyse the oxygen atom transfer reaction between dimethylsulfoxide and triphe
- Whiteoak, Christopher J.,Britovsek, George J. P.,Gibson, Vernon C.,White, Andrew J. P.
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scheme or table
p. 2337 - 2344
(2009/06/28)
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- Synthesis of [N, N'-Bis(5-benzoyl-4-phenylthiazol-2-yl)-N, N-bisbenzyl]ethane-1, 2-diamines
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Synthesis of [N,N'-bis(N-benzoylthiocarbamoyl)-N,N'-bis(benzyl)]ethane-1,2- diamines 4a-h, their cyclization to [N,N'-bis(5-benzoyl-4-phenylthiazol-2-yl)-N, N'-bisbenzyl]ethane-1,2-diamines 5a-h by reaction with phenacyl bromide and the results of antibacterial activity assay of 4a-h and 5a-h are reported.
- Asha,Manju,Pradeep,George,Rajasekharan
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scheme or table
p. 1726 - 1730
(2009/05/30)
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- Vanadium(IV and V) complexes of Schiff bases and reduced Schiff bases derived from the reaction of aromatic o-hydroxyaldehydes and diamines: Synthesis, characterisation and solution studies
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Several sal2en-type reduced Schiff bases have been prepared from the reaction of 2 equiv. of salicylaldehyde (or derivatives) with ethylenediamine followed by reduction with NaBH4 and subsequently characterised. The water-soluble ligands (SO3-sal)2en and R(SO3-sal)2en (SO3-sal = salicylaldehyde-5- sulphonate) have been studied by pH potentiometry and 1H NMR spectroscopy and the protonation constants of R(SO3-sal) 2en have been determined. The Schiff bases are more susceptible to hydrolysis than the corresponding reduced Schiff bases. The crystal structures of H2(o-van)2en and KH(o-van)2en (o-van = o-vanillin) have been determined by X-ray diffraction. The vanadium(IV) complexes have been prepared and characterised by magnetic measurements and IR, UV/Vis and EPR spectroscopy. The colours, magnetic susceptibilities and IR spectra of the new vanadium(IV) complexes of the reduced Schiff bases now obtained suggest oligomeric/polymeric structures for the compounds while the corresponding VIVO-Schiff-base complexes are monomeric. The complexation of [VIVO]2+ and [VVO 2]+ with R(SO3-sal)2en in aqueous solution has been studied by pH potentiometry, UV/Vis as well as by EPR spectroscopy for the VIVO system and 1H and 51V NMR spectroscopy for the VVO2 system. Complex formation constants have been determined and binding modes have been proposed. N,N′-ethylenebis(pyridoxylaminato) (Rpyr2en) has also been obtained and the structure of Na[VVO2(Rpyr 2en)]·CH3OH·3H2O determined by X-ray diffraction. The Rpyr2en2- ligand coordinates through both the N-amine and O-phenolate moieties in a symmetrical α-cis type coordination mode, i.e. with both O-phenolato donors cis to the O-oxo atoms and trans to each other. Wiley-VCH Verlag GmbH & Co. KGaA, 2005.
- Correia, Isabel,Costa Pessoa, Joao,Duarte, M. Teresa,Da Piedade, M. Fatima Minas,Jackush, Tamas,Kiss, Tamas,Castro, M. Margarida C. A.,Geraldes, Carlos F. G. C.,Avecilla, Fernando
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p. 732 - 744
(2007/10/03)
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- Efficient tetrahydrosalen synthesis from Mannich-type bases
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Synthesizing a variety of tetrahydrosalens from hydrolyzing 1,3-bis (2′-hydroxy-5′-substituted-benzyl)imidazolidines with hydrochloric acid is described. Further reaction of such tetrahydrosalens with aldehydes yielded 2-substituted-1,3-bis(2′-hydroxy-5′-substituted-benzyl) imidazolidines.
- Rivera, Augusto,Quevedo, Rodolfo,Navarro, Miguel A.,Maldonado, Mauricio
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p. 2479 - 2485
(2007/10/03)
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- Copper(II)-Catalyzed Oxidation of Alcohols to Carbonyl Compounds with Hydrogen Peroxide
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Copper(II) complex 1 efficiently catalyses the oxidation of alcohols to the corresponding carboxylic acid analogues and ketones in the presence of H22 in high yields. ( Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003).
- Velusamy, Subbarayan,Punniyamurthy, Tharmalingam
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p. 3913 - 3915
(2007/10/03)
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- Cobalt(II)-catalyzed oxidation of alcohols into carboxylic acids and ketones with hydrogen peroxide
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The oxidation of aliphatic and aromatic alcohols into the corresponding carboxylic acid analogues and ketones has been carried out using 30% H2O2 and cobalt(II) complex 1 in good to high yields. The reaction is safe, clean and functions in the absence of additives.
- Das, Subhabrata,Punniyamurthy
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p. 6033 - 6035
(2007/10/03)
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- Copper(II)-catalyzed C-H oxidation of alkylbenzenes and cyclohexane with hydrogen peroxide
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Copper(II) complex 1 efficiently catalyses the oxidation of alkylbenzenes and cyclohexane into the corresponding ketones in moderate to high yields in the presence of 30% H2O2. This protocol is simple, clean and generates water as the only by-product.
- Velusamy, Subbarayan,Punniyamurthy
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p. 8955 - 8957
(2007/10/03)
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- Synthesis, redox properties, and EPR spectroscopy of manganese(III) complexes of the ligand N,N-bis(2-hydroxybenzyl)-N′-2-hydroxybenzylidene-1,2-diaminoethane: Formation of mononuclear, dinuclear, and even higher nuclearity complexes
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The synthesis and characterization of the title trisphenolate ligand are described. From its reaction with manganese(III) three complexes were isolated. The crystal structures revealed one pentacoordinate monomer and two similar dimers with different solvents of crystallization. In the dimers the metal ions are hexacoordinate and connected through bridging of two phenolates. A combination of electrochemistry and EPR spectroscopy showed that, in acetonitrile, the isolated batches were all identical and mainly monomeric, indicating that the mononuclear complex is in equilibrium with the dimer and perhaps also with complexes of higher nuclearity, as suggested by the detection of both the trimer and the tetramer by electrospray ionization mass spectrometry (ESI-MS). The successful use of the monomer batch as an epoxidation catalyst indicated that a high-valent manganese-oxo species can be formed, although it is probably short-lived. This is also suggested by EPR studies of the species formed by electrochemical oxidation of the complex. Upon one-electron oxidation, a manganese(IV) species was formed, which was at least partly converted to another species containing a phenoxy radical.
- Schmitt, Heimo,Lomoth, Reiner,Magnuson, Ann,Park, Jonathan,Fryxelius, Jacob,Kritikos, Mikael,Martensson, Jerker,Hammarstroem, Leif,Sun, Licheng,Akermark, Bjoern
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p. 3757 - 3768
(2007/10/03)
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- Tetrahydroimidazoles - A promising group of expected NSAIDS - Their synthesis and anti-inflammatory activity
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Several new 1, 2, 3-trisubstituted tetrahydroimidazoles (11-28) have been synthesised and their structures elucidated on the basis of spectral data. These compounds show promising anti-inflammatory activity by carrageenin induced paw edema test in rats and few of them showed an activity better than indomethacin.
- Khan,Chawla, Gita
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p. 653 - 663
(2007/10/03)
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- Synthesis of novel tetrahydroimidazole derivatives and studies for their biological properties
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Ethylenediamine was reacted with suitable aromatic aldehydes in order to prepare their respective diSchiff bases. These compounds were then reduced to give the corresponding tetrahydrodiSchiff bases, which were low melting in nature. Finally, these derivatives were condensed with different aromatic aldehydes to give the desired tetrahydroimidazoles. The structures of all these compounds were established on the basis of spectral data. These novel tetrahydroimidazoles showed promising anti-inflammatory and analgesic activity. The compounds were also screened for their anti-bacterial property against Staphylococcus aureus and Escherichia coli.
- Sharma, Vibha,Khan
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p. 651 - 658
(2007/10/03)
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- Zirconium borohydride - A versatile reducing agent for the reduction of electrophilic and nucleophilic substrates
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Zirconium borohydride, a potential reducing agent, reduces acids, esters, imines to the corresponding alcohols and secondary amines in good yield at room temperature within two hours. This facile reducing property was taken advantage off in the synthesis of pheromones and some novel chiral precursors for asymmetric synthesis.
- Narasimhan,Balakumar
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p. 4387 - 4395
(2007/10/03)
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- Studies on antiamoebic compounds: Part IV - Synthesis of hexahydopyrimidines and tetrahydroimidazoles
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Several compounds containing o-alkylaminomethylenephenolic group (Mannich group) incorporating heterocycles such as hexahydropyrimidines and tetrahydroimidazoles have been synthesiszed.Compound 18 has been found to be active against hepatic amoebiasis.Effect of substituents on the conformations of hexahydropyrimidines is discussed.
- Kalyanam, N,Parthasarathy, P C,Ananthan, L,Manjunatha, S G,Likhate, M A
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p. 243 - 247
(2007/10/02)
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- Study of Binuclear Copper(II) Complexes Derived from Tetradentate Mannich Base Complexes
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Several new mononuclear Cu(II) complexes of tetradentate mannich bases have been prepared.The mononuclear complexes have been used as bidentate ligands in the preparation of binuclear complexes of the types and (ClO4)2, where
- Patel, Kalpana V.,Bhattacharya, Pabitra K.
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p. 527 - 529
(2007/10/02)
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