87-41-2Relevant articles and documents
Acid-tolerant intermetallic cobalt-nickel silicides as noble metal-like catalysts for selective hydrogenation of phthalic anhydride to phthalide
Zhang, Liangliang,Chen, Xiao,Chen, Yujing,Peng, Zhijian,Liang, Changhai
, p. 1108 - 1116 (2019)
Chemoselective hydrogenation of phthalic anhydride is regarded as the most promising route for producing downstream high-performance phthalide. A series of intermetallic cobalt-nickel silicide catalysts embedded in a carbon matrix (CoxNi2-xSi@C) with acid-tolerance prepared by microwave-assisted chemical vapor deposition have been investigated in this reaction system. Activity measurements show a remarkable positive synergistic effect, forming a volcano-shaped plot over the nominal Co metal fraction for CoxNi2-xSi@C catalysts with a peak at x = 1.5, which corresponds to a 4.5-fold enhancement of the yield of phthalide over Co2Si@C and a 2.0-fold enhancement over the Ni2Si@C monometallic silicide catalysts, which can be correlated with the interaction of cobalt-nickel and metal-silicon bonds. In addition, the cobalt-rich bimetallic silicide exhibits an equal activity to the reference noble metal catalysts (Au, Pd, and Pt) and a significantly higher activity than transition metal catalysts. Moreover, the bimetallic silicide as an intermetallic compound catalyst has demonstrated robust acid corrosion resistance compared to the corresponding metal catalysts.
Porous chitosan-MnO2 nanohybrid: A green and biodegradable heterogeneous catalyst for aerobic oxidation of alkylarenes and alcohols
Shaabani, Ahmad,Borjian Boroujeni, Mahmoud,Laeini, Mohmmad Sadegh
, p. 154 - 159 (2016)
A porous chitosan-manganese dioxide (PC-MnO2) nanohybrid was synthesized using an in situ reduction method, in which potassium permanganate solution and nanoporous chitosan acted as precursor and reducing agent. The chemical and structural properties of PC-MnO2 were characterized using scanning and transmission electron microscopies, X-ray diffraction, thermogravimetric analysis and Fourier transform infrared spectroscopy. Highly dispersed MnO2 nanoparticles in a matrix of porous chitosan showed high catalytic activity for selective aerobic oxidation of alkylarenes and alcohols without using any bases or expensive oxidants. Short reaction time, ease of product separation by filtration and recyclability of the catalyst make it environmentally and economically favoured for the synthesis of versatile aldehydes and ketones.
Catalytic enantioselective intramolecular Tishchenko reaction ofmeso-dialdehyde: synthesis of (S)-cedarmycins
Ismiyarto,Kishi, Nobuki,Adachi, Yuki,Jiang, Rui,Doi, Takahiro,Zhou, Da-Yang,Asano, Kaori,Obora, Yasushi,Suzuki, Takayoshi,Sasai, Hiroaki,Suzuki, Takeyuki
, p. 11606 - 11609 (2021)
The first successful example of a catalytic enantioselective intramolecular Tishchenko reaction of ameso-dialdehyde in the presence of a chiral iridium complex is described. Chiral lactones were obtained in good yields with up to 91% ee. The obtained enantioenriched lactones were utilized for the first synthesis of (S)-cedarmycins A and B.
Carbon monoxide as a One Carbon Component in Palladium Catalysed Cycloaddition Reactions
Grigg, Ronald,Khalil, Hashim,Levett, Philip,Virica, Julia,Sridharan, Visuvanathar
, p. 3197 - 3200 (1994)
Pd(0), generated in-situ, in combination with TlOAc promotes a range of catalytic bi- and tri-molecular cycloadditions of aryl/heteroaryl iodides in which carbon monoxide (1 atm) functions as a one carbon component furnishing 5-7 membered rings in good yield.
Efficient conversion of dimethyl phthalate to phthalide over CuO in aqueous media
Fu, Jun,Ren, Dezhang,Li, Lu,Liu, Yunjie,Jin, Fangming,Huo, Zhibao
, p. 123 - 127 (2016)
An efficient conversion of dimethyl phthalate (DMP) to phthalide (PHT) over CuO in aqueous media was investigated. Among the catalysts we tested, various metals or metal oxides were effective for the conversion of DMP to PHT in water, and CuO showed excellent catalytic activity and gave the best result. The PHT yield of 85% was achieved when Zn acted as a reductant. Mechanism study for the conversion of DMP suggested that an intermediate 2-hydroxymethyl benzoic acid was produced in the process. The present study provides a useful route for the production of PHT from DMP.
Strong base catalysis of sulfated mesoporous alumina for the Tishchenko reaction in supercritical carbon dioxide
Seki, Tsunetake,Onaka, Makoto
, p. 262 - 263 (2005)
Heterogeneous strong base catalysis for the Tishchenko reaction in acidic scCO2 solvent has been realized with mesoporous alumina modified with SO42-, while a conventional solid base like CaO showed almost no catalytic performance in scCO2. Copyright
Au/FeOx-TiO2 as an efficient catalyst for the selective hydrogenation of phthalic anhydride to phthalide
Liu, Ying Xin,Xing, Tie Feng,Luo, Yi Ming,Li, Xiao Nian,Yan, Wei
, p. 1322 - 1325 (2010)
Au/FeOx-TiO2, prepared by deposition-precipitation method, is an efficient and stable catalyst for the liquid phase selective hydrogenation of phthalic anhydride to phthalide under mild reaction conditions.
An efficient carbonylation of aryl halides catalysed by palladium complexes with phosphite ligands in supercritical carbon dioxide
Kayaki, Yoshihito,Noguchi, Yushi,Iwasa, Seiji,Ikariya, Takao,Noyori, Ryoji
, p. 1235 - 1236 (1999)
The carbonylation of aryl halides catalysed by CO2 soluble Pd complexes with trialkyl or triaryl phosphite ligands proceeds rapidly in scCO2, in which the rate of the reaction is higher than those attained in solution phase reactions.
(Diacetoxyiodo)benzene-mediated oxygenation of benzylic C(sp3)-H bonds with N-hydroxyamides at room temperature
Qian, Peng-Cheng,Liu, Yu,Song, Ren-Jie,Hu, Ming,Yang, Xu-Heng,Xiang, Jian-Nan,Li, Jin-Heng
, p. 1680 - 1684 (2015)
A new, metal-free method for the formation of C(sp3)-O bonds was established by PhI(OAc)2-mediated oxygenation of benzylic C(sp3)-H bonds with N-hydroxyamides at room temperature, in which the C(sp3)-H oxidation is activated by a polyflurophenylamide group.
Mechanistic insight into the synergistic Cu/Pd-catalyzed carbonylation of aryl iodides using alcohols and dioxygen as the carbonyl source
Li, Junxuan,Zhou, Jinlei,Wang, Yumei,Yu, Yue,Liu, Qiang,Yang, Tilong,Chen, Huoji,Cao, Hua
, p. 68 - 74 (2021/11/16)
Pd-catalyzed carbonylation, as an efficient synthetic approach to the installation of carbonyl groups in organic compounds, has been one of the most important research fields in the past decade. Although elegant reactions that allow highly selective carbonylations have been developed, straightforward routes with improved reaction activity and broader substrate scope remain long-term challenges for new practical applications. Here, we show a new type of synergistic Cu/Pd-catalyzed carbonylation reaction using alcohols and dioxgen as the carbonyl sources. A broad range of aryl iodides and alcohols are compatible with this protocol. The reaction is concise and practical due to the ready availability of the starting materials and the scalability of the reaction. In addition, the reaction affords lactones and lactams in an intermolecular fashion. Moreover, DFT calculations have been performed to study the detailed mechanisms. [Figure not available: see fulltext.]
