939-97-9Relevant articles and documents
Preparation, characterization and catalytic performance of bimetallic Ti-Co-MCM-41 catalysts
Zhang, Jinfeng,Zhang, Jiyao,Zhao, Jianshe,Zhang, Cunshe,Shen, Hanxi,Zhou, Kui
, p. 273 - 276 (2015)
Ti-Co-MCM-41 molecular sieve catalysts were synthesized using the impregnation method. The catalysts were characterized by X-ray diffraction, UV-visible, Fourier transform infrared spectroscopy and low temperature N2 adsorption-desorption. Their performance in 4-tert-butylbenzaldehyde synthesis was evaluated in mild conditions by oxygen oxidation 4-tert-butyltoluene. The results showed that the catalysts had large surface area and pore size and contained titanium and cobalt with four ligands, which formed the catalysts of high catalytic activity. The conversion rate of 4-tert-butyl toluene was improved by 38%, the selectivity of 4-tert-butyl benzaldehyde was improved by 85% and the yield of 4-tert-butyl benzaldehyde was up to 35%.
Liquid phase selective oxidation of aromatic alcohols employing nanoparticles of Zirconia supported on nickel manganese oxide: Synthesis, characterization and catalytic evaluation
Alabbad, Saad,Adil,Alwarthan, Abdulrahman,Siddiqui, M. Rafiq H.
, p. 8927 - 8932 (2013)
Zirconia nanoparticles supported on nickel manganese mixed oxide were synthesized by co-precipitation method. The catalytic properties of these materials were investigated for the oxidation of benzyl alcohol using molecular oxygen as oxidant. It was obser
Selective oxidation of benzylic alcohols with molecular oxygen catalyzed by copper-manganese oxide nanoparticles
Ali, Roushown,Assal,Al-Warthan, Abdulrahman,Rafiq,Siddiqui
, p. 4815 - 4819 (2013)
The catalytic activity of copper-manganese (CuMn) mixed oxide nanoparticles (Cu/Mn = 1:1) prepared by co-precipitation method has been studied for the selective oxidation of benzyl alcohol and its derivatives to the corresponding aldehydes using molecular
The selective oxidation of benzyl alcohols in a membrane reactor
Grigoropoulou,Clark,Hall,Scott
, p. 547 - 548 (2001)
The selective oxidation of benzyl alcohols by hypochlorite and a phase transfer catalyst has been successfully carried out in a membrane reactor.
Gold nanoparticles on hydrotalcites as efficient catalysts for oxidant-free dehydrogenation of alcohols
Fang, Wenhao,Zhang, Qinghong,Chen, Jing,Deng, Weiping,Wang, Ye
, p. 1547 - 1549 (2010)
Hydrotalcite-supported gold nanoparticles with sizes of less than 5 nm are highly efficient and reusable catalysts for the oxidant-free dehydrogenation of alcohols to carbonyl compounds and hydrogen. The Royal Society of Chemistry 2010.
Inhibition of the Cobalt Acetate/Bromide-Catalyzed Hydrogen Peroxide Oxidation of 4-tert-Butyltoluene
Amin, Ahmed A.,Beattie, James K.
, p. 879 - 882 (2003)
The hydrogen peroxide oxidation of 4-tert-butyltoluene to 4-tert-butylbenzaldhyde, an important fragrance intermediate, catalyzed by cobalt acetate and bromide in acetic acid was investigated again. The initial stages of the reaction appear to be rapid and quantitative, but after approximately 25-30% conversion, the process ceases. Overoxidation to 4-tert-butylbenzoic acid does not occur. It appears that both water and the aldehyde product itself inhibit further oxidation. An engineering solution to remove the product continuously seems required for process optimization.
Functionalized-1,3,4-oxadiazole ligands for the ruthenium-catalyzed Lemieux-Johnson type oxidation of olefins and alkynes in water
Hkiri, Shaima,Touil, Soufiane,Samarat, Ali,Sémeril, David
, (2021/11/30)
Three arene-ruthenium(II) complexes bearing alkyloxy(5-phenyl-1,3,4-oxadiazol-2-ylamino)(4-trifluoromethylphenyl)methyl ligands were quantitatively obtained through the reaction of (E)-1-(4-trifluoromethylphenyl)-N-(5-phenyl-1,3,4-oxadiazol-2-yl)-methanimine with the ruthenium precursor [RuCl2(η6-p-cymene)]2 in a mixture of the corresponding alcohol and CH2Cl2 at 50 °C. The obtained complexes were fully characterized by elemental analysis, infrared, NMR and mass spectrometry. Solid-state structures confirmed the coordination of the 1,3,4-oxadiazole moiety to the ruthenium center via their electronically enriched nitrogen atom at position 3 in the aromatic ring. These complexes were evaluated as precatalysts in the Lemieux-Johnson type oxidative cleavage of olefins and alkynes in water at room temperature with NaIO4 as oxidizing agent. Good to full conversions of olefins into the corresponding aldehydes were measured, but low catalytic activity was observed in the case of alkynes. In order to get more insight into the mechanism, three analogue arene-ruthenium complexes were synthesized and tested in the oxidative cleavage of styrene. The latter tests clearly demonstrated the importance of the hemilabile alkyloxy groups, which may form more stable (N,O)-chelate intermediates and increase the efficiency of the cis-dioxo-ruthenium(VI) catalyst.
A Metal–Organic Framework as a Multiphoton Excitation Regulator for the Activation of Inert C(sp3)?H Bonds and Oxygen
Cai, Junkai,Cai, Wei,Du, Zenggang,Duan, Chunying,He, Cheng,Ji, Guanfeng,Wei, Jianwei,Zhao, Liang
supporting information, (2021/11/27)
The activation and oxidization of inert C(sp3)?H bonds into value-added chemicals affords attractively economic and ecological benefits as well as central challenge in modern chemistry. Inspired by the natural enzymatic transformation, herein,
Controlled reduction of activated primary and secondary amides into aldehydes with diisobutylaluminum hydride
Azeez, Sadaf,Kandasamy, Jeyakumar,Sabiah, Shahulhameed,Sureshbabu, Popuri
supporting information, p. 2048 - 2053 (2022/03/31)
A practical method is disclosed for the reduction of activated primary and secondary amides into aldehydes using diisobutylaluminum hydride (DIBAL-H) in toluene. A wide range of aryl and alkyl N-Boc, N,N-diBoc and N-tosyl amides were converted into the corresponding aldehydes in good to excellent yields. Reduction susceptible functional groups such as nitro, cyano, alkene and alkyne groups were found to be stable. Broad substrate scope, functional group compatibility and quick conversions are the salient features of this methodology.
C70Fullerene Catalyzed Photoinduced Aerobic Oxidation of Benzylamines to Imines and Aldehydes
Kumar, Inder,Kumar, Rakesh,Gupta, Shiv Shankar,Sharma, Upendra
supporting information, p. 6449 - 6457 (2021/05/29)
C70 fullerene catalyzed photoinduced oxidation of benzylic amines at ambient conditions has been explored here. The developed strategy's main feature includes the additive/oxidant-free conversion of benzylic amine to corresponding imine and aldehydes. The reaction manifests broad substrate scope with excellent function group leniency and is applicable up to the gram scale. Further, symmetrical secondary amines can also be synthesized from benzylic amine in a one-pot two-step process. Various experiments and density functional theory studies revealed that the current reaction involves the generation of reactive oxygen species, single electron transfer reaction, and benzyl radical formation as key steps under photocatalytic conditions.
