822-67-3Relevant articles and documents
Selective allylic oxidation of cyclohexene over a novel nanostructured CeO2–Sm2O3/SiO2 catalyst
Rao, Bolla Govinda,Sudarsanam, Putla,Nallappareddy,Yugandhar Reddy,Venkateshwar Rao,Reddy, Benjaram M.
, p. 6151 - 6168 (2018)
Abstract: Selective allylic oxidation of cyclohexene was investigated over nanostructured CeO2/SiO2 and CeO2–Sm2O3/SiO2 catalysts synthesized by a feasible deposition precipitation method. The CeO2–Sm2O3/SiO2 catalyst showed excellent catalytic efficiency with ~89?% cyclohexene conversion and ~90?% selectivity for allylic products (i.e., 2-cyclohexen-1-ol and 2-cyclohexene-1-one), while only ~50 and ~35?% cyclohexene conversion was observed, respectively, over CeO2/SiO2 and CeO2 catalysts. Systematic characterization of the designed catalysts was undertaken to correlate their catalytic activity with the physicochemical properties using X-ray diffraction (XRD) analysis, Brunauer–Emmett–Teller (BET) surface area measurements, Raman spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and NH3-temperature programmed desorption (TPD) techniques. The results revealed that doping of Sm3+ into the ceria lattice and simultaneous dispersion of resultant Ce–Sm mixed oxides on the silica surface led to improved structural, acidic, and catalytic properties. The better catalytic efficiency of CeO2–Sm2O3/SiO2 was due to high specific surface area, more structural defects, and high concentration of strong acid sites, stimulated by synergistic interaction between various oxides in the catalyst. The cyclohexene conversion and selectivity for allylic products depended on the reaction temperature, nature of solvent, molar ratio of cyclohexene to oxidant, and reaction time. Possible reaction pathways are proposed for selective allylic oxidation of cyclohexene towards 2-cyclohexen-1-ol and 2-cyclohexene-1-one products. Graphical Abstract: SiO2-supported CeO2–Sm2O3 nanocatalyst exhibited outstanding catalytic performance with superior selectivity for allylic products in liquid-phase selective oxidation of cyclohexene under mild reaction conditions.[Figure not available: see fulltext.].
Studies in the rearrangement of epoxides with lithium dialkylamide-lithium tert-butoxide
Saravanan, Parthasarathy,DattaGupta, Arpita,Bhuniya, Debnath,Singh, Vinod K.
, p. 1855 - 1860 (1997)
Rearrangement of epoxides with lithium diethylamide or lithium diisopropylamide in conjunction with lithium tert-butoxide was studied in different solvents. In some cases, an increase in the rate of reaction was observed.
Selective hydroxylation of cyclohexene in water as an environment-friendly solvent with hydrogen peroxide over febipyridine encapsulated in y-type zeolite
Yamaguchi, Syuhei,Fukura, Tomohiro,Fujita, Chiharu,Yahiro, Hidenori
, p. 713 - 715 (2012)
The selective hydroxylation of cyclohexene to 2-cyclohexen- 1-ol with hydrogen peroxide in water was successfully achieved using [Fe(bpy) 3]2+ complexes encapsulated into Y-type zeolite.
Enhanced catalytic activity of TAPO-5 in the oxidation of cyclohexene with hydrogen peroxide under anhydrous conditions
Alfayate, Almudena,Márquez-álvarez, Carlos,Grande-Casas, Marisol,Bernardo-Maestro, Beatriz,Sánchez-Sánchez, Manuel,Pérez-Pariente, Joaquín
, p. 211 - 218 (2013)
This work studies the influence of the amount of water accompanying and stabilizing the conventional oxidant agent H2O2 on the activity of different TAPO-5 materials in cyclohexene oxidation, in comparison to that of the par excellen
Highly efficient and expeditious PdO/SBA-15 catalysts for allylic oxidation of cyclohexene to cyclohexenone
Ganji, Saidulu,Bukya, Padma,Vakati, Venkateswarlu,Rao, Kamaraju Seetha Rama,Burri, David Raju
, p. 409 - 414 (2013)
A series of four PdO/SBA-15 catalysts with 1, 2, 4, 5% (by weight) loading of PdO have been prepared by a conventional impregnation method and are characterized by N2-adsorption, low-angle and wide-angle XRD, XPS and TEM techniques. The catalys
Mixed-Valent Mn16-Containing Heteropolyanions: Tuning of Oxidation State and Associated Physicochemical Properties
Haider, Ali,Ibrahim, Masooma,Bassil, Bassem S.,Carey, Akina M.,Viet, Anh Nguyen,Xing, Xiaolin,Ayass, Wassim W.,Mi?ambres, Juan F.,Liu, Rongji,Zhang, Guangjin,Keita, Bineta,Mereacre, Valeriu,Powell, Annie K.,Balinski, Kamil,N'Diaye, Alpha T.,Küpper, Karsten,Chen, Han-Yi,Stimming, Ulrich,Kortz, Ulrich
, p. 2755 - 2764 (2016)
The two 16-manganese-containing, Keggin-based 36-tungsto-4-silicates [MnIII10MnII6O6(OH)6(PO4)4(A-α-SiW9O34)4]28- (1) and [
Four-coordinate trispyrazolylboratomanganese and -iron complexes with a pyrazolato Co-ligand: Syntheses and properties as oxidation catalysts
Tietz, Thomas,Limberg, Christian,Stoesser, Reinhard,Ziemer, Burkhard
, p. 10010 - 10020 (2011)
A series of complexes of the type [(TpR1,R2)M(X)] (Tp=trispyrazolylborato) with R1/R2 combinations Me/tBu, Ph/Me, iPr/iPr, Me/Me and for M=Mn or Fe coordinating [PzMe,tBu] - (Pz=pyrazolato) or Cl
Highly efficient aerobic oxidation of alkenes over unsupported nanogold
Boualleg, Malika,Guillois, Kevin,Istria, Bertrand,Burel, Laurence,Veyre, Laurent,Basset, Jean-Marie,Thieuleux, Chloe,Caps, Valerie
, p. 5361 - 5363 (2010)
An octylsilane-stabilized colloidal dispersion of 2 nm crystalline gold nanoparticles is highly active and selective for the aerobic oxidations of stilbene and cyclohexene in methylcyclohexane.
Synthesis and characterization of Au nanocatalyst on modifed bentonite and silica and their applications for solvent free oxidation of cyclohexene with molecular oxygen
Shahabi Nejad,Ghasemi,Martínez-Huerta,Ghiaci
, p. 118 - 126 (2015)
In the present work, the selective liquid phase oxidation of cyclohexene mainly to 2-cyclohexe-1-one has been investigated over gold nanoparticles (GNPs) with molecular oxygen in a solvent-free condition. Gold nanoparticles were synthesised on two modifie
Copper-cationic salphen catalysts for the oxidation of cyclohexene by oxygen
Abdolmaleki, Amir,Adariani, Soheila Rezaei
, p. 97 - 100 (2015)
The modified copper-cationic salphen catalysts were synthesized and used in the allylic oxidation of cyclohexene to 2-cyclohexen-1-ol and 2-cyclohexen-1-one with oxygen under mild conditions. Compared with their unmodified counterpart, the catalytic activ
