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.
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.
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Harrison et al.
, p. 5793 (1970)
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Hamaguchi,Ibata
, p. 287 (1976)
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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
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.
Sodium organoaluminate containing bidentate pyrrolyl ligand: Synthesis, structure, and catalytic activity for the Tishchenko reaction
Liu, Yu,Guo, Zhiqiang,Wang, Yakong
, (2021/05/26)
An novel sodium organoaluminate containing bidentate pyrrolyl ligand [C4H3NH(2-CH2NHtBu)] was efficiently synthesized and characterized by X-ray crystallography. The molecular structure shows it is a monodimensional infinite chain structures with linear arrangements. Its basic repeat unit comprises the Al atom bonded to two deprotonated pyrrole rings and Na atom coordinated to of nitrogen atoms of –NtBu fragment, which undergoes further to coordinates a pyrrolyl ring of an adjacent molecule in a ?2-fasion. Furthermore, this sodium organoaluminate exhibited high catalytic activities for Tishchenko reaction.
Covalent Organic Frameworks toward Diverse Photocatalytic Aerobic Oxidations
Liu, Shuyang,Tian, Miao,Bu, Xiubin,Tian, Hua,Yang, Xiaobo
supporting information, p. 7738 - 7744 (2021/05/07)
Photoactive two-dimensional covalent organic frameworks (2D-COFs) have become promising heterogenous photocatalysts in visible-light-driven organic transformations. Herein, a visible-light-driven selective aerobic oxidation of various small organic molecules by using 2D-COFs as the photocatalyst was developed. In this protocol, due to the remarkable photocatalytic capability of hydrazone-based 2D-COF-1 on molecular oxygen activation, a wide range of amides, quinolones, heterocyclic compounds, and sulfoxides were obtained with high efficiency and excellent functional group tolerance under very mild reaction conditions. Furthermore, benefiting from the inherent advantage of heterogenous photocatalysis, prominent sustainability and easy photocatalyst recyclability, a drug molecule (modafinil) and an oxidized mustard gas simulant (2-chloroethyl ethyl sulfoxide) were selectively and easily obtained in scale-up reactions. Mechanistic investigations were conducted using radical quenching experiments and in situ ESR spectroscopy, all corroborating the proposed role of 2D-COF-1 in photocatalytic cycle.
