98-82-8Relevant articles and documents
On the Mechanism of Reductive Cleavage of the Carbon-Nitrogen Bond of Aliphatic Nitro Compounds with Tributyltin Hydride
Kamimura, Akio,Ono, Noboru
, p. 3629 - 3636 (1988)
Denitrohydrogenation reaction of aliphatic nitro compounds with tributyltin hydride (Bu3SnH) is accelerated in the presence of radical initiators.ESR and electrochemical measurements reveal that the reductive cleavage of the carbon-nitrogen bond proceeds not via anion radicals of nitro compounds such as SRN1 reaction but via β-scission of (tributylstannyloxy)nitroxyl radicals.The relative reactivities of tin radicals toward substituted α-nitrocumenes, α-nitroethylbenzenes, and α-nitropropiophenones exhibits excellent Hammett correlations with positive ρ values.This tendency has also been found in the reaction of benzyl halides with tin radical.These results suggest that the carbon-nitrogen bond breaking from nitroxyl radical intermediates should take place in rate-determining step for the reaction.
Gas-liquid and gas-liquid-solid catalysis in a mesh microreactor
Abdallah, Radwan,Meille, Valerie,Shaw, John,Wenn, David,De Bellefon, Claude
, p. 372 - 373 (2004)
A microstructured mesh contactor that can offer residence time of more than minutes is used for gas-liquid-solid hydrogenations and gas-liquid asymmetric hydrogenations. Applications for catalyst/chiral inductor screening and for kinetic data acquisition
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Toptschiew et al.
, p. 976; engl. Ausg. S. 929 (1955)
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HYDROGENATION OF α-METHYLSTYRENE ON MEMBRANE CATALYSTS
Lebedeva, V. I.,Gryaznov, V. M.
, p. 1018 - 1020 (1988)
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Effect of Surface Fluorination with CClF3 on Catalytic Activity of SiO2-Al2O3 for Alkylation of Benzene with Propene
Kurosaki, Akito,Okazaki, Susumu
, p. 2363 - 2367 (1990)
For surface modification, the vapor-phase fluorination of SiO2-Al2O3 with CClF3 was carried out at various temperatures ranging from 350 to 550 deg C in a conventional flow recator.It was found that surface fluorination at about 400 deg C was especially e
One-step conversion of lignin-derived alkylphenols to light arenes by co-breaking of C-O and C-C bonds
Di, Yali,Li, Guangyu,Li, Zhiqin,Liu, Weiwei,Qiu, Zegang,Ren, Xiaoxiong,Wang, Ying
, p. 2710 - 2721 (2022/02/21)
The conversion of lignin-derived alkylphenols to light arenes by a one-step reaction is still a challenge. A 'shortcut' route to transform alkylphenols via the co-breaking of C-O and C-C bonds is presented in this paper. The catalytic transformation of 4-ethylphenol in the presence of H2 was used to test the breaking of C-O and C-C bonds. It was found that the conversion of 4-ethylphenol was nearly 100%, and the main products were light arenes (benzene and toluene) and ethylbenzene under the catalysis of Cr2O3/Al2O3. The conversion of 4-ethylphenol and the selectivity of the products were significantly influenced by the reaction temperature. The selectivity for light arenes reached 55.7% and the selectivity for overall arenes was as high as 84.0% under suitable reaction conditions. Such results confirmed that the co-breaking of the C-O and C-C bonds of 4-ethylphenol on a single catalyst by one step was achieved with high efficiency. The adsorption configuration of the 4-ethylphenol molecule on the catalyst played an important role in the breaking of the C-O and C-C bonds. Two special adsorption configurations of 4-ethylphenol, including a parallel adsorption and a vertical adsorption, might exist in the reaction process, as revealed by DFT calculations. They were related to the breaking of C-O and C-C bonds, respectively. A path for the hydrogenation reaction of 4-ethylphenol on Cr2O3/Al2O3 was proposed. Furthermore, the co-breaking of the C-O and C-C bonds was also achieved in the hydrogenation reactions of several alkylphenols. This journal is
Ligand-enabled and magnesium-activated hydrogenation with earth-abundant cobalt catalysts
Han, Bo,Jiao, Hongmei,Ma, Haojie,Wang, Jijiang,Zhang, Miaomiao,Zhang, Yuqi
, p. 39934 - 39939 (2021/12/31)
Replacing expensive noble metals like Pt, Pd, Ir, Ru, and Rh with inexpensive earth-abundant metals like cobalt (Co) is attracting wider research interest in catalysis. Cobalt catalysts are now undergoing a renaissance in hydrogenation reactions. Herein, we describe a hydrogenation method for polycyclic aromatic hydrocarbons (PAHs) and olefins with a magnesium-activated earth-abundant Co catalyst. When diketimine was used as a ligand, simple and inexpensive metal salts of CoBr2in combination with magnesium showed high catalytic activity in the site-selective hydrogenation of challenging PAHs under mild conditions. Co-catalyzed hydrogenation enabled the reduction of two side aromatics of PAHs. A wide range of PAHs can be hydrogenated in a site-selective manner, which provides a cost-effective, clean, and selective strategy to prepare partially reduced polycyclic hydrocarbon motifs that are otherwise difficult to prepare by common methods. The use of well-defined diketimine-ligated Co complexes as precatalysts for selective hydrogenation of PAHs and olefins is also demonstrated.
