A highly efficient carbon–sulfur bond formation reaction via microwave-assisted nucleophilic substitution of thiols to polychloroalkanes without a transition-metal catalyst

2006 ◽  
Vol 84 (11) ◽  
pp. 1529-1533 ◽  
Author(s):  
Yi-Ju Cao ◽  
Yuan-Yuan Lai ◽  
Hong Cao ◽  
Xiao-Ning Xing ◽  
Xiang Wang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Nucleophilic Substitution ◽  
Bond Formation ◽  
Transition Metal Catalysts ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Formation Reaction ◽  
Mild Conditions ◽  
Microwave Assisted ◽  
Sulfur Bond

An efficient carbon–sulfur bond formation reaction has been developed under microwave irradiation. This reaction affords a novel and rapid synthesis of thioacetals and sulfides under mild conditions. This method is particularly noteworthy given its experimental simplicity and high generality, and no transition-metal catalysts were needed under our conditions.Key words: microwave, sulfide, thiol, nucleophilic substitution.

Synthesis of near-infrared fluorescent rhodamines via an SNArH reaction and their biological applications

2018 ◽  
Vol 16 (39) ◽  
pp. 7163-7169 ◽  
Author(s):  
Qing Wang ◽  
Kun Huang ◽  
Songtao Cai ◽  
Chang Liu ◽  
Xiaojie Jiao ◽  
...  
Keyword(s):  
Transition Metal ◽  
Near Infrared ◽  
Metal Catalyst ◽  
Biological Applications ◽  
Transition Metal Catalyst ◽  
Mild Conditions

Seven rectilinearly π-extended NIR fluorescent rhodamines were synthesized via an intramolecular SNArH reaction under mild conditions without any transition metal catalyst or extra oxidant.

[bmim]PF6/KOH: A Recyclable Catalytic System for an Azide–Arylacetaldehyde [3 + 2] Cycloaddition

2017 ◽  
Vol 41 (11) ◽  
pp. 631-635
Author(s):  
Yuqin Jiang ◽  
Kai Wu ◽  
Xuxia Tan ◽  
Dandan Zhang ◽  
Wenpei Dong ◽  
...  
Keyword(s):  
Transition Metal ◽  
Organic Solvent ◽  
Catalytic System ◽  
Room Temperature ◽  
Reaction Medium ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Green Protocol ◽  
Mild Conditions

A fast and green protocol for the synthesis of 1,4-disubstituted 1,2,3-triazoles from azides and arylacetaldehydes at room temperature was developed using [bmim]PF6/KOH as the reaction medium. It was found that the in situ-generated carbene from [bmim]PF6/KOH acted as the catalyst. In the absence of a transition-metal catalyst and organic solvent, this azide–arylacetaldehyde [3 + 2] cycloaddition proceeds efficiently, with high levels of regioselectivity, broad range of substrates, excellent yields and simple operation under mild conditions.

Progress in propylene homo- and copolymers using advance transition metal catalyst system

2021 ◽  
Author(s):  
Anurag Mishra ◽  
Harshad R. Patil ◽  
VirendraKumar Kumar Gupta
Keyword(s):  
Transition Metal ◽  
Catalyst System ◽  
Metal Catalysts ◽  
Transition Metal Catalysts ◽  
Propylene Polymerization ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Catalyst Development ◽  
System P ◽  
Homogeneous Media

The transition metal catalysts have evolved dynamically in last few years for propylene polymerization and copolymerization in homogeneous media. The trends in catalyst development have moved from modification of Group...

Rapid and Efficient Microwave-Assisted Amination of Electron-Rich Aryl Halides without a Transition-Metal Catalyst

2003 ◽  
Vol 5 (19) ◽  
pp. 3515-3517 ◽  
Author(s):  
Lei Shi ◽  
Min Wang ◽  
Chun-An Fan ◽  
Fu-Min Zhang ◽  
Yong-Qiang Tu
Keyword(s):  
Transition Metal ◽  
Aryl Halides ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Microwave Assisted

Diphenyl Diselenide Catalyzed Oxidative Degradation of Benzoin to Benzoic Acid

Synlett ◽  
2019 ◽  
Vol 30 (14) ◽  
pp. 1683-1687 ◽  
Author(s):  
Hongen Cao ◽  
Tian Chen ◽  
Chenggen Yang ◽  
Jianqing Ye ◽  
Xu Zhang
Keyword(s):  
Transition Metal ◽  
Benzoic Acid ◽  
Low Cost ◽  
Oxidative Degradation ◽  
Metal Catalyst ◽  
Diphenyl Diselenide ◽  
Transition Metal Catalyst ◽  
Mild Conditions

The diphenyl diselenide catalyzed oxidative degradation of benzoin to benzoic acid is reported. As this reaction can convert the malodorous compound into an odorless and innocuous product under mild conditions, it might be useful for pollutant disposal. The reaction does not require a transition-metal catalyst or a chemical oxidant, so that it can be performed at low cost and without generation of wastes. This is believed to be the first example of the use of organoselenium catalysis technology in pollutant destruction, thereby expanding its range of applications.

scholarly journals Practical and stereoselective electrocatalytic 1,2-diamination of alkenes

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Chen-Yan Cai ◽  
Xiao-Min Shu ◽  
Hai-Chao Xu
Keyword(s):  
Natural Products ◽  
Transition Metal ◽  
Asymmetric Synthesis ◽  
Pharmaceutical Compounds ◽  
Inhibitory Effect ◽  
Transition Metal Catalysts ◽  
Metal Catalyst ◽  
Amino Groups ◽  
Transition Metal Catalyst ◽  
Redox Catalyst

Abstract The 1,2-diamine motif is widely present in natural products, pharmaceutical compounds, and catalysts used in asymmetric synthesis. The simultaneous introduction of two amino groups across an alkene feedstock is an appealing yet challenging approach for the synthesis of 1,2-diamines, primarily due to the inhibitory effect of the diamine products to transition metal catalysts and the difficulty in controlling reaction diastereoselectivity and regioselectivity. Herein we report a scalable electrocatalytic 1,2-diamination reaction that can be used to convert stable, easily available aryl alkenes and sulfamides to 1,2-diamines with excellent diastereoselectivity. Monosubstituted sulfamides react in a regioselective manner to afford 1,2-diamines bearing different substituents on the two amino groups. The combination of an organic redox catalyst and electricity not only obviates the use of any transition metal catalyst and oxidizing reagent, but also ensures broad reaction compatibility with a variety of electronically and sterically diverse substrates.

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