Microwave assisted one pot synthesis and characterization of Cesium salt of di-copper substituted phosphotungstate and its application in the selective epoxidation of cis-cyclooctene with tert-butyl hydroperoxide

Patel, Anjali; Sadasivan, Rajesh

doi:10.1016/j.ica.2016.12.031

Cited by 14 publications

(9 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Prussian-blue-modified magnetite for treatment of Cs + in water was also tried [8]. However, the previously reported magnetic adsorbents coated with zeolites [9], polyoxometalates [10], multivalent phosphates [11], titanium ferrocyanide and hexacyanoferrates [12,13] normally do not have a high selectity of Cs + when it co-exists with other alkali cations [14].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Experimental and theoretical investigations of Cs+ adsorption on crown ethers modified magnetic adsorbent

Liu

Zhou

Guo

et al. 2019

Journal of Hazardous Materials

View full text Add to dashboard Cite

show abstract

Section: Accepted Manuscriptmentioning

confidence: 99%

Experimental and theoretical investigations of Cs+ adsorption on crown ethers modified magnetic adsorbent

Liu

Zhou

Guo

et al. 2019

Journal of Hazardous Materials

View full text Add to dashboard Cite

show abstract

“…Controlled reaction without catalyst shows only 1.80% conversion. With respect to the recently accessible literature, catalysts 5–8 appear stronger candidates for heterogeneous oxidation of cis ‐cyclooctene. Likewise, at least six major products, styrene oxide (SO), benzaldehyde (Bza), benzoic acid (Bzac), 2‐phenylacetaldehyde (Pha), 2‐hydroxy‐1‐phenylethanone (Hyphon) and acetophenone (Acph) have been identified (Scheme ) during the oxidation of styrene catalyzed by PS‐[Cu (sal‐sch)Cl] ( 5 ), PS‐[Cu (sal‐tch)Cl] ( 6 ), PS‐[CH 2 {Cu (sal‐sch)Cl} 2 ] ( 7 ) and PS‐[CH 2 {Cu (sal‐tch)Cl} 2 ] ( 8 ).…”

Section: Resultsmentioning

confidence: 96%

“…The above‐mentioned optimized reaction conditions were extended towards the catalytic oxidation of cis ‐cyclooctene, styrene, 1‐methyl cyclohexene and 1‐hexene. At least four major products have been identified during the heterogeneous oxidation of cis ‐cyclooctene catalyzed by 5–8 in the presence of hydrogen peroxide . All the oxidation products of cis ‐cyclooctene, i.e.…”

Section: Resultsmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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.

show abstract

“… 78 The absence of the half-field peak at 1500 Gauss that was indicative of the absence of two copper centers in the same lacuna showed the mononuclear structure of complexes. 85 …”

Section: Resultsmentioning

confidence: 99%

Pyridine-Based NNS Tridentate Chitosan Thiosemicarbazones and Their Copper(II) Complexes: Synthesis, Characterization, and Anticancer Activity

et al. 2022

View full text Add to dashboard Cite

Chitosan-functionalized pyridine-based thiosemicarbazones and their copper(II) complexes have been found to own a substantial antiproliferative activity against the tumorigenic Madin Darby canine kidney (MDCK) and MCF-7 cancer cell lines. In the current study, chitosan oligosaccharide (CS) (87% DDA, M w < 3000 Da) and crab shell chitosan (CCS) (67% DDA, M w 350 kDa) were functionalized as chitosan pyridine-2-thiosemicarbazones and chitosan 2-acetyl pyridine-2-thiosemicarbazones, and their copper(II) complexes were synthesized. The formation of chitosan thiosemicarbazones and their NNS tridentate behavior to give the square planar copper(II) chitosan thiosemicarbazone complexes were established by spectroscopic studies, powder X-ray diffraction, elemental analysis, and magnetic moment measurements. The thermal study showed a marked stability of these derivatives before the outset of chitosan backbone degradation at 200 °C. The colorimetric MTT assay revealed a higher activity of CS thiosemicarbazones, viz., CSTSC series (IC 50 375–381 μg mL –1 in the MDCK cell line and 281–355 μg mL –1 in the MCF-7 cell line) than that of high-molecular-weight CCS thiosemicarbazones, viz., CCSTSC series (IC 50 335–400 μg mL –1 in the MDCK cell line and 365–400 μg mL –1 in the MCF-7 cell line), showing an enhanced activity with a decrease in M w and an increase in DDA of constituent chitosan, a higher activity of both of these series of thiosemicarbazones than that of their native chitosan, viz., CS (IC 50 370 μg mL –1 in the MCF-7 cell line and >400 μg mL –1 in the MDCK cell line) and CCS (IC50 > 400 μg mL –1 in both cell lines), and a higher activity of the Cu-CSTSC complexes (IC 50 322–342 μg mL –1 in the MDCK cell line and 278–352 μg mL –1 in the MCF-7 cell line) and Cu-CCSTSC complexes (IC 50 274–400 μg mL –1 in the MDCK cell line and 231–352 μg mL –1 in the MCF-7 cell line) than that of their respective ligands.

show abstract

Microwave assisted one pot synthesis and characterization of Cesium salt of di-copper substituted phosphotungstate and its application in the selective epoxidation of cis-cyclooctene with tert-butyl hydroperoxide

Cited by 14 publications

References 27 publications

Experimental and theoretical investigations of Cs+ adsorption on crown ethers modified magnetic adsorbent

Experimental and theoretical investigations of Cs+ adsorption on crown ethers modified magnetic adsorbent

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

Pyridine-Based NNS Tridentate Chitosan Thiosemicarbazones and Their Copper(II) Complexes: Synthesis, Characterization, and Anticancer Activity

Contact Info

Product

Resources

About

Microwave assisted one pot synthesis and characterization of Cesium salt of di-copper substituted phosphotungstate and its application in the selective epoxidation of cis-cyclooctene with tert-butyl hydroperoxide

Cited by 14 publications

References 27 publications

Experimental and theoretical investigations of Cs+ adsorption on crown ethers modified magnetic adsorbent

Experimental and theoretical investigations of Cs+ adsorption on crown ethers modified magnetic adsorbent

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

Pyridine-Based NNS Tridentate Chitosan Thiosemicarbazones and Their Copper(II) Complexes: Synthesis, Characterization, and Anticancer Activity

Contact Info

Product

Resources

About

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