scholarly journals Correction: Metal-free oxidative ring contraction of benzodiazepinones: an entry to quinoxalinones

2017 ◽  
Vol 15 (35) ◽  
pp. 7474-7475 ◽  
Author(s):  
Hasan Mtiraoui ◽  
Kevin Renault ◽  
Morgane Sanselme ◽  
Moncef Msaddek ◽  
Pierre-Yves Renard ◽  
...  
Keyword(s):  
Ring Contraction ◽  
Metal Free

Correction for ‘Metal-free oxidative ring contraction of benzodiazepinones: an entry to quinoxalinones’ by Hasan Mtiraoui, et al., Org. Biomol. Chem., 2017, 15, 3060–3068.

Metal-free oxidative ring contraction of benzodiazepinones: an entry to quinoxalinones

2017 ◽  
Vol 15 (14) ◽  
pp. 3060-3068 ◽  
Author(s):  
Hasan Mtiraoui ◽  
Kevin Renault ◽  
Morgane Sanselme ◽  
Moncef Msaddek ◽  
Pierre-Yves Renard ◽  
...  
Keyword(s):  
Practical Method ◽  
Ring Contraction ◽  
Metal Free

Herein is reported a practical method for the construction of 3-benzoylquinoxalinones from benzodiazepinones in the presence of DMSO which serves both as a solvent and an oxidant.

scholarly journals Metal-free synthesis of indanes by iodine(III)-mediated ring contraction of 1, 2-dihydronaphthalenes

2011 ◽  
Vol 22 (9) ◽  
pp. 1795-1807 ◽  
Author(s):  
Fernanda A Siqueira ◽  
Eloisa E Ishikawa ◽  
André Fogaça ◽  
Andréa T Faccio ◽  
Vânia M. T Carneiro ◽  
...  
Keyword(s):  
Ring Contraction ◽  
Metal Free

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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