Metal-free direct difunctionalization of alkenes with I2O5 and P(O)–H compounds leading to β-iodophosphates

2015 ◽  
Vol 2 (10) ◽  
pp. 1356-1360 ◽  
Author(s):  
Chunli Liu ◽  
Minghui Zhu ◽  
Wei Wei ◽  
Daoshan Yang ◽  
Hong Cui ◽  
...  
Keyword(s):  
Efficient Procedure ◽  
Metal Free

A novel and efficient procedure for direct difunctionalization of alkenes with I2O5 and P(O)–H compounds has been developed under metal-free conditions.

PEG-400 as carbon synthon: highly selective synthesis of quinolines and methylquinolines under metal-free conditions

2021 ◽  
Author(s):  
Chengcheng Ding ◽  
Shichen Li ◽  
Kaili Feng ◽  
Ma Chen
Keyword(s):  
Selective Synthesis ◽  
Efficient Procedure ◽  
Metal Free ◽  
Peg 400

A metal-free, peroxide-free, and efficient procedure for the highly selective synthesis of quinolines and methylquinolines was reported. The main feature of this method was that the same substrate can produce...

Efficient construction of C–S and C–N bonds via metal-free reductive coupling of N-tosylhydrazones with benzo[d]thiazole-2-thiol

RSC Advances ◽  
2014 ◽  
Vol 4 (32) ◽  
pp. 16855-16863 ◽  
Author(s):  
Yuqing Lin ◽  
Puying Luo ◽  
Qiang Zheng ◽  
Yumei Liu ◽  
Xiaoyan Sang ◽  
...  
Keyword(s):  
Reductive Coupling ◽  
Thiazole Derivatives ◽  
Efficient Procedure ◽  
Metal Free ◽  
Efficient Construction

An efficient procedure for the synthesis of diverse benzo[d]thiazole derivatives has been developed via metal-free reductive coupling of N-tosylhydrazones with benzo[d]thiazole-2-thiols.

Triarylmethyl chlorides as novel, efficient, and mild organic catalysts for the synthesis of N-sulfonyl imines under neutral conditions

2008 ◽  
Vol 86 (5) ◽  
pp. 456-461 ◽  
Author(s):  
Ali Khalafi-Nezhad ◽  
Abolfath Parhami ◽  
Abdolkarim Zare ◽  
Amir Nasrolahi Shirazi ◽  
Ahmad Reza Moosavi Zare ◽  
...  
Keyword(s):  
Efficient Procedure ◽  
Metal Free ◽  
Highly Efficient ◽  
Neutral Media ◽  
Neutral Conditions ◽  
Organic Catalysts

A highly efficient procedure for the preparation of N-sulfonyl imines via condensation of sulfonamides with aldehydes as well as ketones in the presence of triarylmethyl chlorides as metal-free organo-catalysts at 40 °C is described. The advantages of this class of catalysts over the reported ones are their efficiency and possibility of running reactions in neutral media that makes them suitable for acid-sensitive substrates.Key words: triarylmethyl chloride, N-sulfonyl imine, sulfonamide, aldehyde, ketone.

Metal-free synthesis of imidazo[1,5-a]pyridines via elemental sulfur mediated sequential dual oxidative Csp3–H amination

2018 ◽  
Vol 16 (31) ◽  
pp. 5570-5574 ◽  
Author(s):  
Jie Sheng ◽  
Jidan Liu ◽  
He Zhao ◽  
Liyao Zheng ◽  
Xingchuan Wei
Keyword(s):  
Elemental Sulfur ◽  
Efficient Procedure ◽  
Metal Free

An efficient procedure for imidazo[1,5-a]pyridine formation via dual oxidative Csp3–H amination using elemental sulfur is described.

Lewis acid-catalyzed 2-arylquinazoline formation from N′-arylbenzimidamides and paraformaldehyde

2016 ◽  
Vol 18 (21) ◽  
pp. 5773-5776 ◽  
Author(s):  
Xiufang Cheng ◽  
Huamin Wang ◽  
Fuhong Xiao ◽  
Guo-Jun Deng
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Efficient Procedure ◽  
Metal Free ◽  
Acid Catalyzed

An efficient procedure for the synthesis of 2-arylquinazolines from N′-arylbenzimidamides has been developed under transition-metal-free conditions.

The Shadow Widths of Very Small Particles are Formed Independently of the Metal Cap Build Up on the Particle

1981 ◽  
Vol 39 ◽  
pp. 568-569
Author(s):  
George C. Ruben
Keyword(s):  
Gold Particle ◽  
Film Surface ◽  
Small Particles ◽  
Geometric Process ◽  
Metal Free ◽  
Shadow Area

The formation of shadows behind small particles has been thought to be a geometric process (GP) where the metal cap build up on the particle creates a shadow width the same size as or larger than the particle. This GP cannot explain why gold particle shadow widths are generally larger than the gold particle and may have no appreciable metal cap build up (fig. 1). Ruben and Telford have suggested that particle shadow widths are formed by the width dependent deflection of shadow metal (SM) lateral to and infront of the particle. The trajectory of the deflected SM is determined by the incoming shadow angle (45°). Since there can be up to 1.4 times (at 45°) more SM directly striking the particle than the film surface, a ridge of metal nuclei lateral to and infront of the particle can be formed. This ridge in turn can prevent some SM from directly landing in the metal free shadow area. However, the SM that does land in the shadow area (not blocked by the particle or its ridge) does not stick and apparently surface migrates into the SM film behind the particle.

Recent advancement in the electrocatalytic synthesis of ammonia

Nanoscale ◽  
2020 ◽  
Vol 12 (15) ◽  
pp. 8065-8094 ◽  
Author(s):  
Xudong Wen ◽  
Jingqi Guan
Keyword(s):  
Metal Oxide ◽  
Oxide Catalysts ◽  
Single Atom ◽  
Metal Oxide Catalysts ◽  
Metal Free ◽  
Recent Advancement ◽  
Nanocomposite Catalysts

Different kinds of electrocatalysts used in NRR electrocatalysis (including single atom catalysts, metal oxide catalysts, nanocomposite catalysts, and metal free catalysts) are introduced.

Transition-metal-free catalytic hydroboration reduction of amides to amines

2020 ◽  
Vol 7 (21) ◽  
pp. 3515-3520
Author(s):  
Wubing Yao ◽  
Jiali Wang ◽  
Aiguo Zhong ◽  
Shiliang Wang ◽  
Yinlin Shao
Keyword(s):  
Transition Metal ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Value Added ◽  
Metal Free

The selective catalytic reduction of amides to value-added amine products is a desirable but challenging transformation.

Deaminative carbonylative thioesterification of activated alkylamines with thiophenols under transition-metal-free conditions

2021 ◽  
Author(s):  
Fengqian Zhao ◽  
Xiao-Feng Wu
Keyword(s):  
Free Radical ◽  
Transition Metal ◽  
Metal Free

A transition-metal-free radical carbonylation of activated alkylamines with thiophenols has been successfully developed. Various thioesters were selectively produced with moderate to good yields.

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