936-51-6Relevant articles and documents
Synthesis of novel acidic ionic liquid immobilized on silica
Ma,Wang,Liang,Hu,Shen,Wu
, p. 665 - 670 (2014)
A novel acidic ionic liquid immobilized on silica has been synthesized by hydrolyzing tetraethyl orthosilicate (TEOS) and the acidic ionic liquid derived from (3-aminopropyl) trimethoxysilane. The catalytic activities were evaluated in the acetalization a
Highly active solid oxide acid catalyst for the synthesis of benzaldehyde glycol acetal
Han, Xiaoxiang,Cai, Jinwang,Mao, Xiaorui,Yang, Xinya,Qiu, Linyan,Li, Fanghao,Tang, Xiujuan,Wang, Yanbo,Liu, Shang-Bin
, (2021)
A series of composite metal oxide catalysts, namely CeMnTiO, CeCoTiO, and CeFeTiO, were prepared by sol-gel method, and their physicochemical properties were characterized by various techniques, viz. SEM, XRD, XPS, and NH3-TPD. Their desirable
Ultrafast and continuous synthesis of unaccommodating inorganic nanomaterials in droplet- and ionic liquid-assisted microfluidic system
Hoang, Phan Huy,Park, Hoseok,Kim, Dong-Pyo
, p. 14765 - 14770 (2011)
Despite many efforts on the synthesis of inorganic nanomaterials with uniform structure and narrow size distribution in a fast and continuous way, it is still a critical challenge in the chemistry research community due to the uncontrollable mass and heat
Kinetics and Mechanism of 1,3-Dioxolane Formation from Substituted Benzaldehydes with Ethylene Oxide in the Presence of Tetrabutylammonium Halides
Font, Jose,Galan, Maria A.,Virgili, Albert
, p. 75 - 78 (1986)
Kinetic measurements of the reaction among eight substituted benzaldehydes and ethylene oxide in the presence of catalytic amounts of tetrabutylammonium halides have been performed.With poor electrophilic aldehydes the rate-determining step of the reaction is the nucleophilic attack of the halogeno ethoxide anion to the carbonyl group while with rich electrophilic aldehydes the rate-determining step becomes the ring opening of ethylene oxide by the halide anion.Hammet correlations and kinetic results confirm these proposed mechanisms.
Highly selective reductive catalytic fractionation at atmospheric pressure without hydrogen
Ren, Tianyu,You, Shengping,Zhang, Zhaofeng,Wang, Yuefei,Qi, Wei,Su, Rongxin,He, Zhimin
supporting information, p. 1648 - 1657 (2021/03/09)
Reductive catalytic fractionation (RCF) is an efficient and selective way to produce phenolic monomers from lignin. However, this strategy is difficult to scale up due to its high operating pressure. In this work, we investigated RCF reaction at or near atmospheric pressure and without the use of hydrogen. The atmospheric RCF (ARCF) was conducted in acidified ethylene glycol in glass vessels at 185-195 °C catalyzed by 5% Ru/C. The products mainly include propylguaiacol and propylsyringyl (up to 95.6% among the lignin monomers) and do not contain propanolguaiacol, propanolsyringyl, or H monomers. Although the total yield of lignin monomers in ARCF is about one-quarter less than that of RCF, the operation of ARCF is much easier, milder, safer, and cheaper due to the atmospheric condition and the feasibility of the semi-continuous operation.
An Intramolecular Iodine-Catalyzed C(sp3)?H Oxidation as a Versatile Tool for the Synthesis of Tetrahydrofurans
Br?se, Stefan,Koch, Vanessa
supporting information, p. 3478 - 3483 (2021/07/22)
The formation of ubiquitous occurring tetrahydrofuran patterns has been extensively investigated in the 1960s as it was one of the first examples of a non-directed remote C?H activation. These approaches suffer from the use of toxic transition metals in overstoichiometric amounts. An attractive metal-free solution for transforming carbon-hydrogen bonds into carbon-oxygen bonds lies in applying economically and ecologically favorable iodine reagents. The presented method involves an intertwined catalytic cycle of a radical chain reaction and an iodine(I/III) redox couple by selectively activating a remote C(sp3)?H bond under visible-light irradiation. The reaction proceeds under mild reaction conditions, is operationally simple and tolerates many functional groups giving fast and easy access to different substituted tetrahydrofurans.
Application of poly(Vinylbenzyltrimethylammonium tribromide) resin as an efficient polymeric catalyst in the acetalization and diacetylation of benzaldehydes
Han, Bingbing,Hu, Junjun,Li, Xianwei,Zheng, Zubiao
supporting information, p. 287 - 293 (2021/04/28)
The applications of a new supported tribromide reagent (poly(vinylbenzyltrimethylammonium tribromide) resin) were reported. This supported tribromide resin was used as a catalyst in the acetalization and diacetylation of benzaldehydes under mild conditions with high efficiency. The effects of solvents, and amount of the supported tribromide resin on the reactions were investigated. Under the optimal conditions, most of acetal and 1,1-diacetates of benzaldehydes were selectively obtained in excellent yields.
Inhibition by Water during Heterogeneous Br?nsted Acid Catalysis by Three-Dimensional Crystalline Organic Salts
Belokon, Yuri N.,Gak, Alexander,Khakina, Ekaterina,Khrustalev, Victor N.,Korlyukov, Alexander A.,Kuznetsova, Svetlana,Li, Han,Lobanov, Nikolai,Nelyubina, Yulia,North, Michael,Peregudov, Alexander S.,Riazanov, Vladimir,Zhereb, Vladimir
, p. 6364 - 6372 (2021/10/20)
A new self-assembled and self-healing class of metal free, recyclable, heterogeneous Br?nsted acid catalysts has been developed by the protonation of aniline derivatives (tetrakis(4-aminophenyl)methane, leuco-crystal violet, benzidine, and p-phenylenediamine) with aromatic sulfonic acids (tetrakis(phenyl-4-sulfonic acid)methane, and 2,6-naphthalenedisulfonic acid). As a result, five three-dimensional crystalline organic salts (F-1a, F-1b, F-1c, F-2, and F-3) were obtained, linked by hydrogen bonds and additionally stabilized by the opposite charges of the components. Frameworks F-2 and F-3 were prepared for the first time and characterized by elemental analysis, X-ray structural analysis (for F-2), thermogravimetry, SEM, and FTIR spectroscopy. The catalytic activities of crystalline organic salts F-1-3 have been explored in industrially important epoxide ring-opening and acetal formation reactions. The presence of encapsulated water inside frameworks F-1a and F-2 had an inhibitory effect on the performance of the catalysts. X-ray diffraction analysis of hydrated and dehydrated samples of F-1a and F-2 indicated that water of crystallization served as a cross-linking agent, diminishing the substrate induced "breathing"affinities of the frameworks.
Ni-catalyzed reductive decyanation of nitriles with ethanol as the reductant
Wu, Ke,Ling, Yichen,Sun, Nan,Hu, Baoxiang,Shen, Zhenlu,Jin, Liqun,Hu, Xinquan
supporting information, p. 2273 - 2276 (2021/03/09)
A nickel-catalyzed reductive decyanation of aromatic nitriles has been developed, in which the readily available and abundant ethanol was applied as the hydride donor. Various functional groups on the aromatic rings, such as alkoxyl, amino, imino and amide, were compatible in this catalytic protocol. Heteroaryl, benzylic and alkenyl nitriles were also tolerated. Mechanistic investigation indicated that ethanol provided hydride efficientlyviaβ-hydride elimination in this reductive decyanation.
Alcohol Etherification via Alkoxy Radicals Generated by Visible-Light Photoredox Catalysis
Rivero, Alexandra R.,Fodran, Peter,Ondrejková, Alica,Wallentin, Carl-Johan
, p. 8436 - 8440 (2020/11/03)
A mechanistically divergent method is described that, employing a commercially available hypervalent iodine(III) reagent, generates alkoxy radicals from 1°, 2°, and 3° alcohols and allows their use in the functionalization of C(sp3)-H and C(sp2)-H bonds. This visible-light photoredox catalysis produces alkyl ethers via 1,5/6-hydrogen atom transfer or aryl ethers via 1,5-addition. This mild methodology provides a practical strategy for the synthesis of acetals, orthoesters, tetrahydrofurans, and chromanes.