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.

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.

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.

COx-free hydrogen production via ammonia decomposition over mesoporous Co/Al2O3 catalysts with highly dispersed Co species synthesized by a facile method

2021 ◽  
Author(s):  
Yingqiu Gu ◽  
Di Xu ◽  
Yun Huang ◽  
Zhouyang Long ◽  
Guojian Chen
Keyword(s):  
Fuel Cells ◽  
Hydrogen Production ◽  
Transition Metal ◽  
Transition Metals ◽  
Ammonia Decomposition ◽  
Metal Catalyst ◽  
Facile Synthesis ◽  
Transition Metal Catalyst ◽  
Highly Dispersed ◽  
Free Hydrogen

Transition metals have been considered as potential catalysts for ammonia decomposition to produce COx-free hydrogen for fuel cells. However, the facile synthesis of transition metal catalyst with small size active...

scholarly journals Transition Metal Catalyst‐Free, Base‐Promoted 1,2‐Additions of Polyfluorophenylboronates to Aldehydes and Ketones

2021 ◽  
Author(s):  
Zhiqiang Liu ◽  
Goutam Kumar Kole ◽  
Yudha P. Budiman ◽  
Ya-Ming Tian ◽  
Alexandra Friedrich ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Catalyst ◽  
Free Base ◽  
Transition Metal Catalyst ◽  
Catalyst Free ◽  
Aldehydes And Ketones

Pyridine mediated transition-metal-free direct alkylation of anilines using alcohols via borrowing hydrogen conditions

2020 ◽  
Vol 56 (88) ◽  
pp. 13607-13610 ◽  
Author(s):  
Rajagopal Pothikumar ◽  
Venugopal T Bhat ◽  
Kayambu Namitharan
Keyword(s):  
Transition Metal ◽  
Traditional Approach ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Metal Free ◽  
Borrowing Hydrogen ◽  
Activation Of Alcohols ◽  
Catalyst Systems ◽  
Hydrogen Reactions

Herein, we report aza-aromatics based organic mediators as a readily accessible alternative to the traditional approach of using transition metal catalyst systems for the activation of alcohols in borrowing hydrogen reactions.

Copolymerization Studies of Vinyl Chloride and Vinyl Acetate with Ethylene Using a Transition-Metal Catalyst

2002 ◽  
Vol 124 (30) ◽  
pp. 8790-8791 ◽  
Author(s):  
Harold W. Boone ◽  
Phillip S. Athey ◽  
Michael J. Mullins ◽  
Dean Philipp ◽  
Richard Muller ◽  
...  
Keyword(s):  
Transition Metal ◽  
Vinyl Acetate ◽  
Vinyl Chloride ◽  
Metal Catalyst ◽  
Transition Metal Catalyst
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