Toward Greener Oxidative Transformations: Base-Metal Catalysts and Metal-Free Reactions

2015 ◽  
Vol 15 (5) ◽  
pp. 949-963 ◽  
Author(s):  
Xiao-Feng Wu
Keyword(s):  
Base Metal ◽  
Metal Catalysts ◽  
Metal Free ◽  
Oxidative Transformations

Designed pincer ligands supported Co(II)-based catalysts for dehydrogenative activation of alcohols: Studies on N-alkylation of amines, -alkylation of ketones and synthesis of quinolines

2021 ◽  
Author(s):  
Anshu Singh ◽  
Ankur Maji ◽  
Mayank Joshi ◽  
Angshuman Roychoudhury ◽  
Kaushik Ghosh
Keyword(s):  
Base Metal ◽  
Metal Catalysts ◽  
Pincer Ligands ◽  
Activation Of Alcohols

Base-metal catalysts Co1, Co2 and Co3 were synthesized from designed pincer ligands L1, L2 and L3 having NNN donor atoms respectively. Co1, Co2 and Co3 were characterized by IR, UV–Vis....

ChemInform Abstract: Recent Advances on the Design of Group VIII Base-Metal Catalysts with Encapsulated Structures

ChemInform ◽  
2015 ◽  
Vol 46 (39) ◽  
pp. no-no
Author(s):  
Hao Tian ◽  
Xinyu Li ◽  
Liang Zeng ◽  
Jinlong Gong
Keyword(s):  
Base Metal ◽  
Metal Catalysts ◽  
Group Viii ◽  
Recent Advances ◽  
Encapsulated Structures

C–H Alkylation of Heteroarenes with Alkyl Oxalates by Molecular Photoelectrocatalysis

Synlett ◽  
2020 ◽  
Author(s):  
Hai-Chao Xu ◽  
Fan Xu ◽  
Xiao-Li Lai
Keyword(s):  
Alkylation Reaction ◽  
Metal Free ◽  
Molecular Catalyst ◽  
Oxidative Transformations

AbstractAn oxidant- and metal-free photoelectrocatalytic C–H alkylation reaction of heteroarenes with alkyl oxalates has been developed. Several classes of heteroaromatics, such as quinolines, isoquinolines, pyridines, and phenanthridines, can be alkylated with tertiary or secondary alkyl oxalates. The photoelectrochemical synthesis employs 2,4,5,6-tetra-9H-carbazol-9-ylisophthalonitrile as a molecular catalyst and allows the oxidative transformations to proceed through evolution of hydrogen without a sacrificial chemical oxidant.

Metal-Free Insertion of Sulfoxonium Ylides into Arylamines in Water

Synthesis ◽  
2020 ◽  
Author(s):  
Mei Guan ◽  
Yong Wu ◽  
Hua He ◽  
Kaichuan Yan ◽  
Jianglian Li ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Bioactive Compounds ◽  
Late Stage ◽  
Bond Formation ◽  
Metal Catalysts ◽  
Significant Development ◽  
Metal Free ◽  
Water As Solvent ◽  
Mild Temperature

Carbenoid-based N–H insertions have undergone significant development with respect to C–N bond formation in recent years. However, the existing methods suffer from unstable starting materials, expensive metal catalysts and organic solvents. Herein, insertion of sulfoxonium ylides into arylamines under metal-free conditions has been developed. The method employs water as solvent at mild temperature and is amenable to the late-stage modification of structurally complex bioactive compounds.

An Alkaline Water Electrolyzer with Sustainion™ Membranes: 1 A/cm² at 1.9V with Base Metal Catalysts

2017 ◽  
Vol 77 (9) ◽  
pp. 71-73 ◽  
Author(s):  
Zengcai Liu ◽  
Syed D. Sajjad ◽  
Yan Gao ◽  
Jerry Kaczur ◽  
Rich Masel
Keyword(s):  
Base Metal ◽  
Metal Catalysts ◽  
Alkaline Water

scholarly journals Tandem Triphosgene-Assisted Metal-Free One-pot Preparation of Nitriles and Amides from Aldehydes and Ketones

2021 ◽  
Author(s):  
Jianguo liu ◽  
Xiu-Zhi Wei ◽  
Longlong Ma
Keyword(s):  
Metal Catalysts ◽  
Organic Base ◽  
Reaction Conditions ◽  
One Pot ◽  
Metal Free ◽  
Aldehydes And Ketones ◽  
Ester Linkage ◽  
Hydrolysis Of ◽  
By Products

Here we report a facile and efficient triphosgene-assisted one-pot conversion of aldehydes/ketones into nitriles/amides. The triphosgene, a kind of phosgene alternative, containing both ester linkage and chloromethyl units, easily reacts with oximes for the preparation of nitriles/amides. However, the reaction of oximes with triphosgene can’t fully convert corresponding nitriles/amides due to hydrolysis of oximes to aldehydes or ketones. Our protocol tandem proceeds smoothly without the use of organic base and metal catalysts. Diverse functionalized aromatic, aliphatic, and allylic aldehydes/ketones incorporating biomass-derived platform compounds were successfully converted to nitriles and amides in excellent yields. Compared to step-by-step reaction, this tandem strategy is characterized by multi-step reaction in one pot, mild reaction conditions, and fewer by-products.

scholarly journals Transition-Metal-Free [3+2] Dehydration Cycloaddition of Donor-Acceptor Cyclopropanes With 2-Naphthols

2021 ◽  
Vol 9 ◽  
Author(s):  
Hua Zhao ◽  
Peng Shen ◽  
Dongru Sun ◽  
Hongbin Zhai ◽  
Yufen Zhao
Keyword(s):  
Transition Metal ◽  
Ring Opening ◽  
Metal Catalysts ◽  
Transition Metal Catalysts ◽  
Cyclization Reaction ◽  
Metal Free ◽  
Efficient Access ◽  
Donor Acceptor ◽  
Acid Catalyzed ◽  
Synthetic Application

A Brønsted acid-catalyzed domino ring-opening cyclization transformation of donor-acceptor (D-A) cyclopropanes and 2-naphthols has been developed. This formal [3+2] cyclization reaction provided novel and efficient access to the naphthalene-fused cyclopentanes in the absence of any transition-metal catalysts or additives. This robust procedure was completed smoothly on a gram-scale to afford the corresponding product with comparable efficiency. Furthermore, the synthetic application of the prepared product has been demonstrated by its transformation into a variety of synthetically useful molecules.

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