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.
Visible-light-responsive lanthanide coordination polymers for highly efficient photocatalytic aerobic oxidation of amines and thiols
An, Shuyi,Che, Yan,Chen, Peng,Guo, Zhifen,Liu, Xin,Xing, Hongzhu
, p. 15767 - 15775 (2021/09/22)
Development of visible-light-induced photocatalytic reactions using molecular oxygen as the terminal oxidant is intriguing in view of the current environmental and energy issues. We report herein the synthesis and characterization of a series of novel pho
Aprotic Amine-modified Manganese Dioxide Catalysts for Selectivity-tunable Oxidation of Amines
Hao, Qianqian,Jia, Xiuquan,Ma, Jiping,Gao, Mingxia,Fan, Xiaomeng,Gao, Jin,Xu, Jie
supporting information, p. 1388 - 1391 (2021/05/06)
Organic modifiers have shown promising potential for regulating the activity and selectivity of heterogeneous catalysts via tuning their surface properties. Despite the increasing application of organic modification technique in regulating the redox-acid
Charge Transfer from Donor to Acceptor in Conjugated Microporous Polymer for Enhanced Photosensitization
Guo, Guang-Chen,Guo, Song,Kong, Li-Hui,Lu, Tong-Bu,Peng, Yuan-Zhao,Zhang, Zhi-Ming
supporting information, p. 22062 - 22069 (2021/08/30)
Photosensitization associated with light absorption and energy/electron-transfer represents the central processes for photosynthesis. However, it's still a challenge to develop a heavy-atom-free (HAF) strategy to improve the sensitizing ability of polymeric photosensitizers. Herein, we propose a new protocol to significantly improve the photosensitization by decorating mother conjugated microporous polymer (CMP-1) with polycyclic aromatic hydrocarbons (PAHs), resulting in a series of CMPs (CMP-2–4). Systematic study reveals that covalent modification with PAHs can transfer charge to Bodipy in CMP to further facilitate both intersystem crossing and electron-hole separation, which can dramatically boost energy-/electron-transfer reactions. Remarkably, CMP-2 as a representative CMP can efficiently drive the photosynthesis of methyl phenyl sulfoxide with 92 % yield, substantially higher than that of CMP-1 (32 %). Experiments and theory calculations demonstrate the structure-property-activity relationship of these CMPs, opening a new horizon for developing HAF heterogeneous photosensitizers with highly efficient sensitizing activity by rational structure regulation at a molecular level.
