Synthesis, characterization and catalytic activity of polymer anchored transition metal complexes toward oxidation reactions

Mondal, Paramita; Tuhina, Kazi; Roy, Anupam Singha; Hossain, Dildar; Mondal, Swastik

doi:10.1007/s11243-010-9409-3

Cited by 18 publications

(8 citation statements)

References 36 publications

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“…The efficiency of the Pd@NP catalyst was compared with that of other reported catalysts in the reduction of 4‐nitrophenol (Table ). Our prepared Pd@NP exhibits a higher catalytic activity and a shorter reaction time compared to other catalysts …”

Section: Resultsmentioning

confidence: 93%

Palladium nanoparticles supported on mesoporous natural phosphate: An efficient recyclable catalyst for nitroarene reduction

Mekkaoui

Jennane

Aberkouks³

et al. 2019

Applied Organom Chemis

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We report the preparation of palladium nanoparticles supported on mesoporous natural phosphate (Pd@NP) using a wetness impregnation method. The prepared catalyst was characterized using various techniques. Furthermore, the reduction and preparation of the palladium nanoparticles was followed using UV–visible spectra. Based on the Scherrer equation, the crystallite size of the as‐synthesized palladium nanoparticles was 10.88 nm. The performance of the synthesized catalyst was investigated in the reduction of 4‐nitrophenol as a model substrate to 4‐aminophenol using NaBH4 as a hydrogen source. Moreover, catalytic reduction of various nitroarenes was studied and monitored using UV–visible spectroscopy and gas chromatography. The Pd@NP catalyst showed a high activity for the selected reaction and could be recycled.

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Section: Resultsmentioning

confidence: 93%

Palladium nanoparticles supported on mesoporous natural phosphate: An efficient recyclable catalyst for nitroarene reduction

Mekkaoui

Jennane

Aberkouks³

et al. 2019

Applied Organom Chemis

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“…As reported in literature, oxidation of cyclohexene by H 2 O 2 gave mainly cyclohexene oxide (Cyox), cyclohex‐2‐enol (2‐cyclohexenol, Hexnol), cyclohexane‐1,2‐diol (Hexdiol), cyclohex‐2‐enone (Hexnon) and 2‐hydroxycyclohexan‐1‐one (Hyhexnon; Scheme ).…”

Section: Resultsmentioning

confidence: 59%

Polymer‐anchored mononuclear and binuclear Cu^II Schiff‐base complexes: Impact of heterogenization on liquid phase catalytic oxidation of a series of alkenes

Maurya

Kesharwani

Kachhap

et al. 2019

Applied Organom Chemis

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Liquid phase catalytic oxidation of a number of alkenes, for example, cyclohexene, cis‐cyclooctene, styrene, 1‐methyl cyclohexene and 1‐hexene, was performed using polymer‐anchored copper (II) complexes PS‐[Cu (sal‐sch)Cl] (5), PS‐[Cu (sal‐tch)Cl] (6), PS‐[CH2{Cu (sal‐sch)Cl}2] (7) and PS‐[CH2{Cu (sal‐tch)Cl}2] (8). Neat complexes [Cu (sal‐sch)Cl] (1), [Cu (sal‐tch)Cl] (2), [CH2{Cu (sal‐sch)Cl}2] (3) and [CH2{Cu (sal‐tch)Cl}2] (4) were isolated by reacting CuCl2·2H2O with [Hsal‐sch] (I), [Hsal‐tch] (II), [H2bissal‐sch] (III) and [H2bissal‐tch] (IV), respectively, in refluxing methanol. Complexes 1–4 have been covalently anchored in Merrifield resin through the amine nitrogen of the semicarbazide or thiosemicarbazide moiety. A number of analytical, spectroscopic and thermal techniques, such as CHNS analysis, Fourier transform‐infrared, UV–Vis, PMR, 13C‐NMR, electron paramagnetic resonance, scanning electron microscopy, energy‐dispersive X‐ray analysis, thermogravimetric analysis, atomic force microscopy, atomic absorption spectroscopy, and electrospray ionization‐mass spectrometry, were used to analyze and establish the molecular structure of the ligands (I)–(IV) and complexes (1)–(8) in solid state as well as in solution state. Grafted complexes 5–8 were employed as active catalysts for the oxidation of a series of alkenes in the presence of hydrogen peroxide. Copper hydroperoxo species ([CuIII (sal‐sch)‐O‐O‐H]), which is believed to be the active intermediate, generated during the catalytic oxidation of alkenes, are identified. It was found that supported catalysts are very economical, green and efficient in contrast to their neat complexes as well as most of the recently reported heterogeneous catalysts.

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“…21 Styrene was used in a Heck coupling using Pd(II) and K 2 CO 3 in benzene/DMF to afford compound 11. 22 The Zconformation of the double bond was confirmed by the 16. 9 Hz proton−proton coupling constant.…”

Section: ■ Results and Discussionmentioning

confidence: 88%

Synthetic Routes to Fluorescent Dyes Exhibiting Large Stokes Shifts

et al. 2012

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Derivatives of isomeric 2-(hydroxytolyl)-4,6-dimethylamino-1,3,5-triazines have been synthesized in high yields in a controlled manner using a multistep reaction sequence. Iodination of either 2-(1'-hydroxy-6'-methylphen-2'-yl)- or 2-(1'-hydroxy-4'-methylphen-2'-yl)-4,6-dimethylamino-1,3,5-triazine with ICl provides species differing in the positioning of the iodo group relative to the hydroxyl which readily undergo Suzuki, Sonogashira, and Heck reactions under Pd(0) catalysis. Thus, thienyl, bisthienyl, and 3,4-ethylenedioxythienyl groups have been directly grafted, while unsubstituted polycyclic aromatics such as pyrene and perylene have been linked via alkyne bridges, as have ethynyldifluoroborondipyrromethane (BODIPY) dyes prepared in situ. The presence of a hydrogen bond in the ground state involving the hydroxyl substituent has been established by proton NMR and several X-ray structure determinations. All of the new dyes with a simple substituent (phenyl, thienyl) exhibited a pronounced green fluorescence resulting from an intramolecular proton transfer in the excited state (ESIPT) which produces a large Stokes shift (>10,000 cm(-1)). With other dyes, the fluorescence of the keto form responsible for the ESIPT process could be used as the input energy in efficient intramolecular energy transfer processes. Replacing perylene with pyrene allowed reversal of the direction of energy transfer from the polyaromatic module to the keto form.

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Synthesis, characterization and catalytic activity of polymer anchored transition metal complexes toward oxidation reactions

Cited by 18 publications

References 36 publications

Palladium nanoparticles supported on mesoporous natural phosphate: An efficient recyclable catalyst for nitroarene reduction

Palladium nanoparticles supported on mesoporous natural phosphate: An efficient recyclable catalyst for nitroarene reduction

Polymer‐anchored mononuclear and binuclear Cu^II Schiff‐base complexes: Impact of heterogenization on liquid phase catalytic oxidation of a series of alkenes

Synthetic Routes to Fluorescent Dyes Exhibiting Large Stokes Shifts

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Synthesis, characterization and catalytic activity of polymer anchored transition metal complexes toward oxidation reactions

Cited by 18 publications

References 36 publications

Palladium nanoparticles supported on mesoporous natural phosphate: An efficient recyclable catalyst for nitroarene reduction

Palladium nanoparticles supported on mesoporous natural phosphate: An efficient recyclable catalyst for nitroarene reduction

Polymer‐anchored mononuclear and binuclear CuII Schiff‐base complexes: Impact of heterogenization on liquid phase catalytic oxidation of a series of alkenes

Synthetic Routes to Fluorescent Dyes Exhibiting Large Stokes Shifts

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Polymer‐anchored mononuclear and binuclear Cu^II Schiff‐base complexes: Impact of heterogenization on liquid phase catalytic oxidation of a series of alkenes