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Expoxidation of olefins using schiff base metal complexes as catalysts.

Noel Forrestal

Expoxidation of olefins using schiff base metal complexes as catalysts.

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Published .
Written in English


The Physical Object
Pagination(v), 105 leaves
Number of Pages105
ID Numbers
Open LibraryOL13767427M

Study on Synthesis, Structural Elucidation of Biologically Active Schiff Base Transition Metal Complexes thu Rajaa* and neb aDepartment of Chemistry, Mohamed Sathak Engineering College, Kilakarai , India. bBharathiyar University, Coimbatore, India e-mail: [email protected] Abstract— The synthesis and spectral. Spectroscopic studies have been used to describe the mechanism of the decomposition of hydrogen peroxide by solutions of a dimeric Cu(II) complex of a dissymmetric Schiff base, [CuSALAD]2.H2O, and imidazole or methyl substituted imidazoles, B, which form monomeric CuSALAD.B2 complexes, in aqueous ethanol solvent. Freezing point depression and vapor. TRANSITION METAL COMPLEXES OF SCHIFF BASE 11 Suraj B. Ade et. al technique. Further the structures of the Schiff base were confirmed by subjecting them to CHN, IR and NMR studies. Synthesis of Metal Complexes M alcoholic solutions (50ml) of metal salt were mixed with M warm alcoholic solution.


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Expoxidation of olefins using schiff base metal complexes as catalysts. by Noel Forrestal Download PDF EPUB FB2

Dinuclear Schiff base complexes of transition metal ions were more efficient catalysts than mononuclear complexes probably due to the synergic effect of two metal ions.

A variety of homo [], [] 54 and hetero 55 dinuclear Schiff base complexes of Expoxidation of olefins using schiff base metal complexes as catalysts. book metal ions were used as catalysts in various reactions [], [], [].Cited by:   Oxidations of various olefins have been carried out using the Mn(III) complexes of Schiff bases derived from the condensation of salicylaldehyde Expoxidation of olefins using schiff base metal complexes as catalysts.

book its derivatives with 1,3-diamino propanol, and the binuclear Mn(II) and Fe(III) complexes of Schiff bases obtained by the condensation of pyridine aldehyde withm- andp-phenylene diamine, as catalysts. Catalytic activity has been correlated with Cited by: 2.

By analogy with metal porphyrins, Schiff base complexes of redox active metal ions have been used as homogeneous catalysts for the epoxidation of olefins using iodosylbenzene as the oxidant [].

It was noted that when the intermediate oxo-cation formed is very stable, its utility as a catalyst is by:   Polymer-linked manganese(III)-salen-type Schiff base complexes were prepared by the copolymerization of functionalized Schiff base, styrene, and divinylbenzene at various mixing ratios (–), followed by introduction of Mn(III) ion.

The materials catalyzed epoxidation of cyclohexene with iodosylbenzene in CH2Cl2 as rapidly as the monomer by: 6. Schiff base ligands are considered “privileged ligands ” because they are easily prepared by the condensation between aldehydes and genic centres or other elements of chirality (planes, axes) can be introduced in the synthetic design.

Schiff base ligands are able to coordinate many different metals, and to stabilize them in various oxidation states, enabling the use of Schiff. derived Schiff bases and metal complexes show microbiological activity against A. niger and A. alternata. Tridentate Schiff base76 and their metal complexes show biocidal activites.

Ruthenium (II) complexes77 with Schif f base salicyladmine, thalium(I) complexes78 with benzothiazolines, copper (II) complexes79 of benzoylpyridine Schiff base showFile Size: 87KB. A series of transition metal alanine-salicylaldehyde Schiff base chromium (III) complexes immobilized on MCM were prepared and characterized by various physico-chemical measurements such as FIIR, XRD, HRTEM, N2 sorption and elemental analysis.

The immobilized complexes were effective and stable catalysts for the epoxidation of styrene and cyclohexene with 30% hydrogen : Gong De Wu, Xiao Li Wang, Zhi Li Zhai. Complexes of the type (dimethyl-bpy)MoO2Cl2 and Schiff/Lewis-base complexes of methyltrioxorhenium (MTO), being efficient homogeneous catalysts for the epoxidation of olefins, have been examined.

Preparation methods of Schiff base complexes:(Bydirect interaction of the Schiff base with the metal salts) The Schiff base can be synthesized without using the metal ion and then followed by addition of the metal ion as salt solution for complex formation.

This can be easily described by the following example. Scheme Size: KB. Polymer-supported Schiff base complexes of metal ions show high catalytic Expoxidation of olefins using schiff base metal complexes as catalysts.

book in comparison to their unsupported analogues. The catalytic activity of metal complexes of different types of. Metal complexes of the two Schiff base li-gands with Co(II), Ni(II), Cu(II), Cd(II), Pd(II) and Pt(IV) ions were prepared by reacting each li-gand with the metal salts in refluxing ethanol.

The chemical structures of the two ligands as well as the stereo-chemical structures and geometries of the studied metal complexes were suggestedFile Size: 2MB.

Keywords: Epoxidation, Solvent effects, Terminal oxidants, Olefins, Manganese, Catalysts, Schiff bases Manganese(III) complexes with Schiff-bases of N 2O2 coordination sphere, commonly known as “salen” complexes, have been reported to act as efficient catalysts for epoxidation of alkenes by Kochi et al.

The activity data show the metal complexes to be more potent antibacterials than the parent Schiff base ligand against one or more bacterial species. Key Words: 2-thiophenecarboxaldehyde, 2-furancarboxaldehyde, 2-aminothiophenol, o-phenylenediamine, transition metal complexes, stability constants, IR, 1H NMR, conductance, solid reflectance.

used to synthesize the Schiff base (HL). Metal complexes of the Schiff base with Mn(II), Co(II), Ni(II), Cu(II), and Cd(II) were Expoxidation of olefins using schiff base metal complexes as catalysts. book and characterized by physical and spectroscopic techniques. Elemental analyses indicated the ligand coordinated to the metal ions in the ratio with distorted octahedral geometry.

An easy method for epoxidation of olefins using bleach (sodium hypochlorite) and either a stoichiometric or catalytic amount of bromide ion has been developed. Without any transition metal catalyst a variety of non-activated olefins give epoxides in high yields and good selectivity at ambient conditions.

of metal complexes depend on the nature of the metal ions and the ligands [13]. It is declared in the literature that different ligands and different complexes synthe-sized from same ligands with different metal ions possess different biological properties [12,14,15].

So, there is an increasing requirement for the discovery of new com-File Size: 1MB. free ligand[15]. Complexes of transition metal with Schiff base derived from 2,3-dihrdrazinoquinoxaline(DHQ) showed antimicrobial acyivity.

Preliminary testing of the ligand and metal complexes for antimicrobial activity on the gram and gram shows that the ligand is active only and the. and Tungsten Schiff Base Complexes on MCM as Nanocatalysts for the Epoxidation of Olefins M.

Masteri-Farahania,*, M. Sadeghib, Y. Abdollahic, M. Mehdi Kashani Motlaghb, F. Salimic a Department of Chemistry, Tarbiat Moallem University, Tehran, Iran b Department of Chemistry, Iran University of Science and Technology, Tehran, IranAuthor: M Masteri Farahani, M Sadeghi, Y Abdollahi, Kashani MotlaghF Salimi.

products obtained using standard mixtures. The effects of various parameters such as concentration of the oxidant and catalyst, temperature and time of the reaction were studied to see their effect on the reaction product pattern.

Results and discussion Liquid phase hydroxylation of phenol catalyzed by the Schiff base complexes using H 2O. So far various Schiff base complexes have been employed to catalytic oxidation of olefins to epoxides and aldehydes, and it has been proved that many Schiff base complexes gave improved results as catalysts for these kinds of oxidation reactions [7–20].

In our research, the synthesized Schiff base complexes have been searched for their Cited by: 4. The potentially tridentate Schiff base ligands [3,5-Bu t (HO)C 6 H 2 CH NL] 1, on reaction with Me 3 Al at room temperature, afford the complexes [(3,5-Bu t (O)C 6 H 2 CH NL)AlMe 2] [L = CH 2 CH 2 NMe 2 2a, (2-PhO)C 6 H 4 2b, 2-CH 2 C 5 H 4 N 2c and 8-C 9 H 6 N (quinoline) 2d], 2a and 2c have been characterised crystallographically; further reaction of the dimethyl compounds with B(C 6 Cited by: Synthesis and characterisation of copper(II) complexes Synthesis and characterisation of new transition metal complexes of Schiff bases derived from 3-hydroxyquinoxalinecarboxalde hyde and application of some of these complexes as hydrogenation and oxidation catalysts redox potentials are summarized in File Size: 1MB.

A new macrocyclic multidentate Schiff-base ligand Na 4 L consisting of two submacrocyclic units (10,bis-iminomethyl-3,6,14,tricyclo[ 8,12 ]tetracosa-1(23),2,6,8,10,12(24),13,17,19,21,-decaene,disodium) and its tetranuclear metal complexes with Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) are reported.

Na 4L was prepared via a template Cited by: 5. In recent years, there has been considerable interest in the chemistry of transition metal of schiff base This is due to the fact that schiff base transition metal complexes are one of the most adaptable and thoroughly studied systems.

The Schiff base complexes have applicable in. Introduction. Schiff base complexes find important position in coordination chemistry and schiff base complexes with transition as well with heavy metals are used in organic synthesis, analytical reagents, and catalysts and in medicine n oxo metal complexes of U 2,3, Os 4, 5,W 6 and Cr 7,8 play an important role in organic synthesis because of their ability to selectively attach oxygen.

N2O2-SCHIFF BASES AND THEIR METAL COMPLEXES A.A. Ahmed, S.A. BenGuzzi and A.O. Agoob Chemistry Departments, Faculty of Science, University of Garyounis, Benghazi, Libya *E-mail: [email protected] ABSTRACT The syntheses of some Ni(II), Co(II) and Cu(II) Schiff base complexes have been reported.

The Schiff base ligands H 2L1 (C 40H 32N 2O 2. Parveez Gull, Athar Adil Hashmi-Synthesis, characterization and antimicrobial activity of transition metal complexes with Schiff base derived from 1, 2-diphenylethane-1, 2-dione with o-phenylenediamine and benzophenone EUROPEAN ACADEMIC RESEARCH - Vol.

II, Issue 4 / July (Germany). Synthesis of metal complexes of Schiff Base: Cu and Co was used as metals for derivation of metal complexes.

In the process gram schiff base was dissolved in 15 ml ethanol. To this solution mole of metal chloride solution were added. This mixture was allowed to stir and refluxed for 3 hours. TheFile Size: 1MB. Synthesis, characterization, and X-ray crystal structures of metal complexes with new Schiff-base ligands and their antibacterial activities.

Journal of Coordination Chemistry65 (6), DOI: /Cited by: Complexes of some metal ions with Schiff base derived from salicylaldehyde and tyrosine have been synthesized and characterized by using different physical tools and an octahedral structure was proposed for all complexes.

(1) Maihub et al. (2) Prepared and investigated some Schiff base complexes of Co(II), Ni(II) and Cu(II) Size: KB. Metal-Salen Schiff base complexes in catalysis: practical aspects. Cozzi PG(1). Author information: (1)Dipartimento di Chimica "G.

Ciamician", Vial Selmi 2, Bologna, Italy. @ Schiff base ligands are considered "privileged ligands" because they are easily prepared by the condensation between aldehydes and by: Schiff bases also have several types of biological actions such as analgesic and antimalerial 6.

They are working as Ligands for complexes of metal ions. Organosilicon complexes with Schiff bases are found to be beneficial in various agricultural applications like fungicides, bactericides, herbicides, acaricides and.

Some novel transition metal [Co(II), Cu(II), Ni(II) and Zn(II)] complexes of substituted pyridine Schiff-bases have been prepared and characterized by physical, spectral and analytical data.

The synthesized Schiff-bases act as deprotonated tridentate for the complexation reaction with Co(II), Ni(II) and Zn(II) by: Title:Advances in Research of Schiff-Base Metal Complexes as Potent Antioxidants VOLUME: 20 ISSUE: 36 Author(s):Irena Kostova and Luciano Saso Affiliation:Department of Chemistry, Faculty of Pharmacy, Medical University, 2 Dunav St., SofiaBulgaria.

Keywords:Schiff-bases, metal complexes, antioxidants Abstract:The search for metal-derived antioxidants has received much attention and. synthesis and magnetic studies on schiff base complexes of copper (II).

Recently, Xishi et al. () reported the synthesis and characterization of Mn (II), Co (II) and Cu (II) complexes with a novel schiff base ligand derived from 2, 2’ – bis(p-methoxylphenylamine) and salicylic aldehyde. Transition metal schiff base complexes have been.

Serb. Chem. Soc. 70 (10) – () UDC –++ JSCS – Original scientific paper Study on phenol oxidation with H2O2 catalyzed by Schiff base manganese complexes as mimetic peroxidase JIN ZHANGa,b, YING TANGb, JIA-QING XIEc, JIAN-ZHANG LIa, WEI ZENGa and CHANG-WEI HUa* aKey Laboratory of Green Chemistry and Technology (Sichuan.

The ligand and their metal complexes were screened for antibacterial activity against staphylococcus aureus, escherinchia coli and salmonella typhi. and fungicidal activity against aspergillus flavus and candida albicans.

Keywords: Schiff base ligand complexes, Thermal analysis, Mass spectrum, Powder x-ray diffraction and Biological activity etc. Copper Schiff Base Catalyzed Michael Additions of b-Ketoesters to Methyl Vinyl Ketone in Water 33 solvents.

24,25 All copper complexes are based on Schiff base ligands derived from salicylaldehyde and chiral amines or chiral amino alcohols and yielded with e.e.'s up to Out with the metal: Metal‐free hydrogenation of unfunctionalized olefins can be achieved by employing HB(C 6 F 5) 2 as the catalyst.

The key step in the catalytic reaction is believed to involve a novel borane‐mediated σ‐bond metathesis, which has been investigated both experimentally and theoretically. Development and Exploration of Schiff base Ruthenium Carbene Catalysts for Olefin Metathesis Bart Allaert Promotor: Prof.

Verpoort Proefschrift ingediend tot het behalen van de graad van Doctor in de Wetenschappen: Scheikunde. Synthesis and Characterization of some transition metal pdf derived from bidentate Schiff base 63 | Page N N Pdf HC + H 2 O H Methanol Reflux N N N O H 3 -(3 -nitrop heny l)-1 -p heny l-1 H - p y raz ole-4 -c arb ald ehy d e 2 -am ino p henol N O 2 N O 2 L ig and.Abdulghani, A.

and Hussain, R. () Synthesis and Characterization of Schiff Base Metal Complexes Derived from Cefotaxime with 1H-indole-2,3-dione (Isatin) and 4-N, Journal of Inorganic Chemistry, 5, doi: /ojicCited by: 4.1.

A process for the production of ebook comprising: 6 ebook an alpha-olefin and: (a) a first compound W, which is a neutral Lewis acid capable of abstracting X−, an alkyl group, or a hydride group from Co to form WX−, (WR20)− or WH− and which is also capable of transferring an alkyl group or a hydride to Co, provided that WX− is a weakly coordinating anion; or.