18511-56-3Relevant articles and documents
Microencapsulated VO(acac)2: Preparation and Use in Allylic Alcohol Epoxidation
Lattanzi, Alessandra,Leadbeater, Nicholas E.
, p. 1519 - 1521 (2002)
(matrix presented) Microencapsulated VO(acac)2 [MC-VO(acac)2] has been prepared and screened with success as a catalyst for the epoxidation of allylic alcohols using tert-butyl hydroperoxide as oxidant. The reactions are run in hexane at room temperature. The MC-VO(acac)2 is reusable without significant loss of activity.
Surface modification of magnetite nanoparticles with molybdenum-dithiocarbamate complex: a new magnetically separable nanocatalyst
Masteri-Farahani, Majid,Modarres, Maryam
, p. 1403 - 1410 (2017)
Surface modification of silica-coated magnetite nanoparticles (SCMNPs) by anchoring of molybdenum-dithiocarbamate complex resulted in the preparation of a new magnetically separable nanocatalyst for the epoxidation of olefins. The prepared nanocatalyst was characterized by various physicochemical techniques which indicated that the molybdenum complex is successfully supported on the SCMNPs support. This heterogeneous catalyst exhibited good catalytic activity and high selectivity in the epoxidation of olefins with tert-butyl hydroperoxide as oxidant under mild reaction conditions. It can be easily recovered by an external magnetic field and reused up to three times without noticeable deactivation. Graphical abstract: [Figure not available: see fulltext.].
Rational Design of a Polyoxometalate Intercalated Layered Double Hydroxide: Highly Efficient Catalytic Epoxidation of Allylic Alcohols under Mild and Solvent-Free Conditions
Li, Tengfei,Wang, Zelin,Chen, Wei,Miras, Haralampos N.,Song, Yu-Fei
, p. 1069 - 1077 (2017)
Intercalation catalysts, owing to their modular and accessible gallery and unique interlamellar chemical environment, have shown wide application in various catalytic reactions. However, the poor mass transfer between the active components of the intercalated catalysts and organic substrates is one of the challenges that limit their further application. Herein, we have developed a novel heterogeneous catalyst by intercalating the polyoxometalate (POM) of Na9LaW10O36?32 H2O (LaW10) into layered double hydroxides (LDHs), which have been covalently modified with ionic liquids (ILs). The intercalation catalyst demonstrates high activity and selectivity for the epoxidation of various allylic alcohols in the presence of H2O2. For example, trans-2-hexen-1-ol undergoes up to 96 % conversion and 99 % epoxide selectivity at 25 °C in 2.5 h. To the best of our knowledge, the Mg3Al?ILs?C8?LaW10composite material constitutes one of the most efficient heterogeneous catalysts for the epoxidation of allylic alcohols (including the hydrophobic allylic alcohols with long alkyl chains) reported so far.
Oxidation of geraniol and other substituted olefins with hydrogen peroxide using mesoporous, sol-gel-made tungsten oxide-silica mixed oxide catalysts
Somma, Filippo,Strukul, Giorgio
, p. 344 - 351 (2004)
The preparation of a series of mesoporous tungsten oxide-silica mixed oxides by sol-gel methods under basic conditions is reported. Surface modification with methyl and 3-chloropropyl groups is possible in an amount between 10 and 40 mol% with respect to the silane precursor. The amount of polar organic functional groups controls the surface area, the porosity, and the catalytic activity of the solids in the oxidation of different substrates with hydrogen peroxide. The oxidation of geraniol is studied in detail. The catalysts are active and produce epoxides in good yields. The latter are influenced by the presence of polar organic groups. The preparation method allows the preparation of catalysts that are resistant to leaching and can be recycled several times without appreciable loss of activity.
Synthesis, characterization and immobilization of a novel mononuclear vanadium (V) complex on modified magnetic nanoparticles as catalyst for epoxidation of allyl alcohols
Azarkamanzad, Zahra,Farzaneh, Faezeh,Maghami, Mahboobeh,Simpson, Jim,Azarkish, Mohammad
, (2018)
The 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tptz) undergoes hydrolysis in the presence of VO(SO4) in an alkaline solution, affording mainly the bis(2-pyridyl carbonyl)amid) VO2 complex, designated as [VO2(bpca)]. Single-crystal X-ray crystallography revealed that the coordination of V in complex is a distorted square-pyramid coordinated with three nitrogen of bis(2-pyridyl carbonyl)amid) ligand and two binding oxygen atoms. The prepared complex which successfully supported on modified Fe3O4 nanoparticles using tetraethylorthosilicate (TEOS) and (3-aminopropyl)trimethoxysilane(APTMS)was designated as Fe3O4@SiO2@APTMS@[VO2(bpca)] complex (nanocatalyst). The complex and nanocatalyst were characterized by means of FT-IR, XRD, VSM, SEM and TEM. The catalytic activity of [VO2(bpca)] complex and Fe3O4@SiO2@APTMS@complex as catalysts 1 and 2 were evaluated by the epoxidation of geraniol, 3-methyl-2-buten-1-ol, trans-2-hexen-1-ol and 1-octen-3-ol with 70–98% conversions and 95–100% selectivities. Based on the obtained results, the heterogeneity and reusability of the catalyst seems promising. In addition, the in vitro antibacterial activity of [VO2 (bpca)] complex have also been evaluated and compared to the activities of other vanadium complexes, tptz ligand and two standard antibacterial drugs, Nalidixic acid and Vancomycin.
A new magnetically recoverable nanocatalyst for epoxidation of olefins
Masteri-Farahani,Tayyebi
, p. 83 - 87 (2011)
In this work, a new magnetically recoverable nanocatalyst was developed by covalent binding of a Schiff base ligand, N,N′-bis(3- salicylidenaminopropyl)amine (salpr), on the surface of silica coated magnetite nanoparticles (SCMNPs) and followed complexation with MoO2(acac) 2. Characterization of the prepared nanocatalyst was performed with different physicochemical methods such as FT-IR and atomic absorption spectroscopies, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM). Finally, catalytic activity of the prepared MoO2salpr/SCMNPs was examined in the epoxidation of olefins with tert-butyl hydroperoxide (TBHP) and cumene hydroperoxide (CHP).
Molybdenum complex tethered to the surface of activated carbon as a new recoverable catalyst for the epoxidation of olefins
Masteri-Farahani,Abednatanzi
, p. 211 - 218 (2014)
A new recoverable catalyst for the epoxidation of olefins was developed by covalent attachment of aminopropyl groups on the surface of oxidized activated carbon (AC) and next reaction with bis(acetylacetonato)dioxomolybdenum(VI). Characterization of the prepared catalyst was performed with different physicochemical methods such as Fourier transform infrared and atomic absorption spectroscopies, scanning electron microscopy, energy-dispersive X-ray and nitrogen sorption analyses. Nitrogen adsorption-desorption analysis revealed that the textural characteristics of the support were changed during the grafting experiments but the channels remained relatively accessible despite sequential reduction in surface area, pore volume and pore size. Elemental analysis showed the presence of 0.06 mmol g-1 molybdenum in the catalyst. The prepared catalyst catalyzed the epoxidation of olefins and allyl alcohols with tert-butyl hydroperoxide (TBHP) and cumene hydroperoxide (CHP) quantitatively with excellent selectivity toward the corresponding epoxides under mild reaction conditions. The results indicated that the hydrophobicity of the AC support promoted the catalytic efficiency of the catalyst in the epoxidation of olefins.
Polyoxotungstates incorporated organophosphonate and nickel: Synthesis, characterization and efficient catalysis for epoxidation of allylic alcohols
Xu, Qiaofei,Li, Yingguang,Ban, Ran,Li, Zhao,Han, Xiao,Ma, Pengtao,Singh, Vikram,Wang, Jingping,Niu, Jingyang
, p. 13479 - 13486 (2018)
Three new sandwich-type organophosphonate-functionalized polyoxotungstate clusters, [{Ni(H2O)5}x(AsW6O21)2{Ni(OOCCH2NCH2PO3)2}3] (x = 0 (Ni1), 1 (Ni2 and Ni3)), were successfully isolated via a "top-down" synthetic strategy. Compounds (Ni1-Ni3) were characterized by single crystal X-ray analysis, X-ray powder diffraction (XRPD), IR spectroscopy, UV-vis spectroscopy, and thermogravimetric analyses (TGA). Magnetic properties provide evidence for antiferromagnetic coupling in Ni2 and Ni3 and ferromagnetic interaction in Ni1. Catalytic studies of the three polyoxotungstates for the oxidation of allylic alcohols to epoxides have been investigated in water with H2O2 as the oxidant. All three polyoxotungstates exhibit efficient catalytic performance with excellent conversion and high selectivity at room temperature.
One-pot, facile synthesis and fast separation of a UiO-66 composite by a metalloporphyrin using nanomagnetic materials for oxidation of olefins and allylic alcohols
Abbasi, Alireza,Masteri-Farahani, Majid,Rayati, Saeed,Zamani, Samira
, p. 654 - 662 (2022/01/22)
One-pot facile synthesis of a new composite based on the incorporation of a metalloporphyrin within the UiO-66 metal-organic framework is reported. To enhance the catalytic activity of UiO-66, pore modification with (CoTHPP(OAC) = meso-tetrakis(4-hydroxyp
ADENOSINE RECEPTOR BINDING COMPOUNDS
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Paragraph 00414, (2020/02/06)
The present invention relates to pharmaceutical compounds and compositions of Formula (I) and methods of treatment using the compounds and compositions, especially for the treatment and/or prevention of a proliferation disorder, such as cancer. Compounds of Formula (I) as further described herein are shown modulators of the adenosine A2A receptor and exhibit antiproliferative activity. Accordingly, these compounds are useful to treat proliferative disorders such as cancer, and other adenosine receptor-related conditions including an inflammatory disease, renal disease, diabetes, vascular disease, lung disease, or an autoimmune disease.
