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.

Quinone-amine polymers as metal-free and reductant-free catalysts for hydroxylation of benzene to phenol with molecular oxygen

2019 ◽  
Vol 55 (54) ◽  
pp. 7772-7775 ◽  
Author(s):  
Weitao Wang ◽  
Hao Tang ◽  
Xulu Jiang ◽  
Fu-E Huang ◽  
Yangmin Ma
Keyword(s):  
Transition Metal ◽  
Molecular Oxygen ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Metal Free ◽  
Hydroxylation Of Benzene

Quinone-amine polymers can be employed as a metal-free and reductant-free catalyst for the hydroxylation of benzene to phenol and can yield phenol as high as the transition metal catalyst.

Transition metal free oxygenation of 8-aminoquinoline amides in water

2018 ◽  
Vol 20 (11) ◽  
pp. 2472-2476 ◽  
Author(s):  
Xinghui Yao ◽  
Xin Weng ◽  
Kaixuan Wang ◽  
Haifeng Xiang ◽  
Xiangge Zhou
Keyword(s):  
Transition Metal ◽  
Benzoyl Peroxide ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Metal Free

The oxygenation of 8-aminoquinoline amides by benzoyl peroxide at the C5 position in water is developed in the absence of a transition metal catalyst, affording the desired products in moderate to good yields of up to 88%.

The first report on the transition metal-free homocoupling of aryl halides in the presence ofl-cysteine

2018 ◽  
Vol 42 (13) ◽  
pp. 10989-10992 ◽  
Author(s):  
Arash Ghorbani-Choghamarani ◽  
Zahra Taherinia
Keyword(s):  
Transition Metal ◽  
Aryl Halides ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
First Report ◽  
Metal Free

A green and efficient methodology for the coupling of aryl halides without the addition of a transition metal catalyst has been presented.

Potassium carbonate-mediated tandem C–S and C–N coupling reaction for the synthesis of phenothiazines under transition-metal-free and ligand-free conditions

RSC Advances ◽  
2016 ◽  
Vol 6 (29) ◽  
pp. 24257-24260 ◽  
Author(s):  
San Wu ◽  
Wei-Ye Hu ◽  
Song-Lin Zhang
Keyword(s):  
Transition Metal ◽  
Potassium Carbonate ◽  
Coupling Reaction ◽  
Metal Catalyst ◽  
Phenothiazine Derivatives ◽  
Transition Metal Catalyst ◽  
Metal Free ◽  
Efficient Approach ◽  
Ligand Free

A potassium carbonate-mediated tandem coupling reaction for the synthesis of phenothiazines is described. This protocol affords an efficient approach for the construction of phenothiazine derivatives without the need for addition of transition-metal catalyst or ligand.

Progress in Development of Catalyst Systems for Coordinated Polymerization of Olefins

2014 ◽  
Vol 900 ◽  
pp. 11-14 ◽  
Author(s):  
Wei Zhou ◽  
Lei Zhong ◽  
Wei Dong Li
Keyword(s):  
Transition Metal ◽  
Olefin Polymerization ◽  
Catalyst System ◽  
Metal Catalyst ◽  
Metallocene Catalysts ◽  
Catalytic Polymerization ◽  
Transition Metal Catalyst ◽  
Polymerization Catalyst ◽  
Catalyst Systems ◽  
Ziegler Natta Catalysts

The research progresses about polyolefin catalyst systems in recent years are summarized. Focusing on the type and properties of the catalytic polymerization of the olefin polymerization catalyst, including typical Ziegler-Natta catalysts, metallocene catalysts and post-transition metal catalyst system. Then the new post-transition metal catalyst is introduced.

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-free allylation of 2-azaallyls with allyl ethers through polar and radical mechanisms

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Guogang Deng ◽  
Shengzu Duan ◽  
Jing Wang ◽  
Zhuo Chen ◽  
Tongqi Liu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Allyl Ether ◽  
Metal Catalyst ◽  
Metal Free ◽  
Allyl Ethers ◽  
Bond Forming ◽  
Allyl Halides ◽  
Synthetic Utility ◽  
Insight Into ◽  
Allyl Esters

AbstractAllylation of nucleophiles with highly reactive electrophiles like allyl halides can be conducted without metal catalysts. Less reactive electrophiles, such as allyl esters and carbonates, usually require a transition metal catalyst to facilitate the allylation. Herein, we report a unique transition-metal-free allylation strategy with allyl ether electrophiles. Reaction of a host of allyl ethers with 2-azaallyl anions delivers valuable homoallylic amine derivatives (up to 92%), which are significant in the pharmaceutical industry. Interestingly, no deprotonative isomerization or cyclization of the products were observed. The potential synthetic utility and ease of operation is demonstrated by a gram scale telescoped preparation of a homoallylic amine. In addition, mechanistic studies provide insight into these C(sp3)–C(sp3) bond-forming reactions.

Sign in / Sign up

Export Citation Format

Share Document