31264-06-9Relevant articles and documents
Transition-Metal-Controlled Inorganic Ligand-Supported Non-Precious Metal Catalysts for the Aerobic Oxidation of Amines to Imines
Yu, Han,Zhai, Yongyan,Dai, Guoyong,Ru, Shi,Han, Sheng,Wei, Yongge
, p. 13883 - 13887 (2017)
Most state-of-art transition-metal catalysts usually require organic ligands, which are essential for controlling the reactivity and selectivity of reactions catalyzed by transition metals. However, organic ligands often suffer from severe problems including cost, toxicity, air/moisture sensitivity, and being commercially unavailable. Herein, we show a simple, mild, and efficient aerobic oxidation procedure of amines using inorganic ligand-supported non-precious metal catalysts 1, (NH4)n[MMo6O18(OH)6] (M=Cu2+; Fe3+; Co3+; Ni2+; Zn2+, n=3 or 4), synthesized by a simple one-step method in water at 100 °C, demonstrating that the catalytic activity and selectivity can be significantly improved by changing the central metal atom. In the presence of these catalysts, the catalytic oxidation of primary and secondary amines, as well as the coupling of alcohols and amines, can smoothly proceed to afford various imines with O2 (1 atm) as the sole oxidant. In particular, the catalysts 1 have transition-metal ion core, and the planar arrangement of the six MoVI centers at their highest oxidation states around the central heterometal can greatly enhance the Lewis acidity of catalytically active sites, and also enable the electrons in the center to delocalize onto the six edge-sharing MO6 units, in the same way as ligands in traditional organometallic complexes. The versatility of this methodology maybe opens a path to catalytic oxidation through inorganic ligand-coordinated metal catalysis.
Nickel-decorated g-C3N4hollow spheres as an efficient photocatalyst for hydrogen evolution and oxidation of amines to imines
Zhang, Shishen,Qian, Xiaobing,Yan, Junqiu,Chen, Kelong,Huang, Jianhua
, p. 11710 - 11719 (2020)
Photocatalysts composed of earth-abundant elements are highly desired for photocatalytic hydrogen evolution as well as oxidation of amines to imines without the requirement of precious metals. Herein, non-precious Ni metal decorated g-C3N4 hollow spheres
Heterojunctions between amorphous and crystalline niobium oxide with enhanced photoactivity for selective aerobic oxidation of benzylamine to imine under visible light
Zhang, Yantao,Pei, Linjuan,Zheng, Zhanfeng,Yuan, Yong,Xie, Tengfeng,Yang, Juan,Chen, Shuai,Wang, Junwen,Waclawik, Eric R.,Zhu, Huaiyong
, p. 18045 - 18052 (2015)
The formation of heterojunctions between two crystals with different band gap structures, acting as a tunnel for the unidirectional transfer of photogenerated charges, is an efficient strategy to enhance the photocatalytic performance of semiconductor pho
Metal-free oxidation of benzyl amines to imines
Wu, Xiao-Feng,Petrosyan, Andranik,Ghochikyan, Tariel V.,Saghyan, Ashot S.,Langer, Peter
, p. 3158 - 3159 (2013)
A convenient procedure for the oxidation of benzyl amines to the corresponding imines has been developed. Various imines were produced in good to excellent yields. Notably, no catalyst was needed, and H2O 2 was used as the oxidant an
Calcined ZnCrCO3-HTlc for the oxidation of benzyl amines to Schiff bases
Choudary,Narender,Bhuma
, p. 631 - 635 (1996)
Oxidation of benzylamines to Schiff bases has been carried out using a mixed oxide catalyst obtained by the calcination of ZnCrCO3-HTlc which is a member of the anionic clay family.
Designed Synthesis of a 2D Porphyrin-Based sp2 Carbon-Conjugated Covalent Organic Framework for Heterogeneous Photocatalysis
Chen, Rufan,Shi, Ji-Long,Ma, Yuan,Lin, Guiqing,Lang, Xianjun,Wang, Cheng
, p. 6430 - 6434 (2019)
The construction of stable covalent organic frameworks (COFs) for various applications is highly desirable. Herein, we report the synthesis of a novel two-dimensional (2D) porphyrin-based sp2 carbon-conjugated COF (Por-sp2c-COF), whi
Aerobic oxidation of amines to imines catalyzed by bulk gold powder and by alumina-supported gold
Zhu, Bolin,Lazar, Mihaela,Trewyn, Brian G.,Angelici, Robert J.
, p. 1 - 6 (2008)
Both bulk gold powder (～50 μm particle size) and alumina-supported gold (50-150 nm) are highly active catalysts for the aerobic oxidative dehydrogenation of amines (CH-NH) to imines (C{double bond, long}N) under the mild conditions of 1 atm O2 and 100 °C. Reactions using the 5% Au/Al2O3 catalyst make efficient use of the gold metal and offer a practical synthesis of imines from amines. These studies add to the growing list of reactions that are catalyzed by bulk gold metal.
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.
Type I ‘Lighted Metal-free’ Photosensitizing Assemblies of Phenazine for Aerobic Oxidative Transformations
Kaur, Lovjot,Kaur, Harpreet,Kumar, Manoj,Bhalla, Vandana
supporting information, p. 4179 - 4186 (2021/11/23)
Highly photostable supramolecular photosensitizing ‘lighted metal-free’ assemblies of DPZ-Th have been developed which show strong absorption in the visible region and excellent electron transportation potential from donor to acceptor units. The as-prepar
Ball-Milling Induced Debonding of Surface Atoms from Metal Bulk for Construing High-Performance Dual-Site Single-Atom Catalysts
Liu, Bo,Pan, Jing,Shi, Weidong,Song, Shuyan,Wang, Huilin,Wang, Xiao,Xu, Jing,Zhang, Hongjie,Zhang, Lingling,Zhao, Meng
supporting information, p. 23154 - 23158 (2021/09/15)
One of the most pressing challenges in single-atom catalysis is the manipulation of the coordination environment of central metals to maximize the catalyst performance. Herein, we fabricated a high-performance catalyst (Co-SNC) by introducing S into the n
