ChemInform Abstract: Metal-Free Synthesis of 2-Alkenyl/Alkynyl-5-nitropyridines Using a Three-Component Ring Transformation.

ChemInform ◽  
2015 ◽  
Vol 46 (49) ◽  
pp. no-no
Author(s):  
Song Thi Le ◽  
Haruyasu Asahara ◽  
Nagatoshi Nishiwaki
Keyword(s):  
Ring Transformation ◽  
Metal Free

Metal-free Synthesis of 2-Alkenyl/Alkynyl-5-nitropyridines Using a Three-component Ring Transformation

2015 ◽  
Vol 44 (6) ◽  
pp. 776-778 ◽  
Author(s):  
Song Thi Le ◽  
Haruyasu Asahara ◽  
Nagatoshi Nishiwaki
Keyword(s):  
Ring Transformation ◽  
Metal Free

A Metal-Free Approach for the Synthesis of 2-Tetralones via Carbanion-Induced Ring Transformation of 2H-Pyran-2-ones

Synthesis ◽  
2018 ◽  
Vol 50 (17) ◽  
pp. 3540-3548 ◽  
Author(s):  
Fateh Singh ◽  
Samata Shetgaonkar
Keyword(s):  
Functional Groups ◽  
Ring Transformation ◽  
Organometallic Reagents ◽  
Metal Free ◽  
Wide Range ◽  
Ultrasound Assisted ◽  
High Yields ◽  
Subsequent Acid

A metal-free, ultrasound-assisted approach for the synthesis of highly functionalized 2-tetralones in high yields is described. The process involves ring transformation of 2H-pyran-2-ones with the spirocyclic ketone 1,4-cyclohexandione monoethylene ketal to yield spiro­cyclic ketals and subsequent acid-mediated hydrolysis. This protocol is free from any organometallic reagents, is economical and tolerates a wide range of functional groups.

scholarly journals Metal-Free Synthesis of Biaryl- and Teraryl-Cored Diarylmethanes by Ring Transformation of 2H-Pyran-2-ones

Synthesis ◽  
2018 ◽  
Vol 51 (06) ◽  
pp. 1435-1444 ◽  
Author(s):  
Fateh Singh ◽  
Priyanka Kole
Keyword(s):  
Reaction Products ◽  
Ring Transformation ◽  
Reaction Conditions ◽  
Metal Free ◽  
High Yields

An efficient metal-free approach for the synthesis of functionalized biaryl-cored diarylmethanes is described by the ring transformation of 2H-pyran-2-ones using 4-phenylbutan-2-one as carbanion source. Moreover, 2H-pyran-2-ones were reacted with 1,3-diphenylacetone in the presence of base to achieve functionalized teraryl-cored diarylmethanes. All the ring transformation reactions were performed under mild reaction conditions to afford the biaryl- and teraryl-cored reaction products in high yields.

Transition metal-free synthesis of sterically hindered allylarenes from 5-hexene-2-one

2020 ◽  
Vol 18 (32) ◽  
pp. 6276-6286
Author(s):  
Ranjay Shaw ◽  
Ismail Althagafi ◽  
Amr Elagamy ◽  
Reeta Rai ◽  
Chandan Shah ◽  
...  
Keyword(s):  
Transition Metal ◽  
Ring Transformation ◽  
Metal Free ◽  
Sterically Hindered

Sterically hindered allylarenes have been synthesized by ring transformation of 2-pyranones with 5-hexene-2-one.

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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