ChemInform Abstract: An Environmental Friendly Approach for the Catalyst-Free Synthesis of Highly Substituted Pyrazoles Promoted by Ultrasonic Radiation.

ChemInform ◽  
2016 ◽  
Vol 47 (17) ◽  
Author(s):  
Firouzeh Nemati ◽  
Seyed Hasan Nikkhah ◽  
Ali Elhampour
Keyword(s):  
Ultrasonic Radiation ◽  
Catalyst Free ◽  
Environmental Friendly ◽  
Substituted Pyrazoles

scholarly journals Catalyst-Free Cascade Synthesis of Densely Functionalized Chromenes in Water

2019 ◽  
Vol 31 (11) ◽  
pp. 2532-2536
Author(s):  
Subrahmanya Ishwar Bhat
Keyword(s):  
Intramolecular Cyclization ◽  
Room Temperature ◽  
Product Yield ◽  
Catalyst Free ◽  
Environmental Friendly ◽  
Simple Filtration ◽  
High Product Yield ◽  
Filtration Technique

An expeditious and environmental friendly, general protocol has been developed for the synthesis of 2-amino-3-cyano-4H-chromenes via cascade Knoevenagel-Michael-intramolecular cyclization in water. Pure solid products were obtained by simple filtration technique. The aqueous catalyst-free reactions lead to high product yield at room temperature.

A rapid, sustainable and environmental friendly protocol for the catalyst-free synthesis of 2-methyl-5-oxo-hexahydroquinoline-3-carboxylate via ultrasonic irradiation

2020 ◽  
Vol 28 ◽  
pp. 100432 ◽  
Author(s):  
Lagudu Devi ◽  
Alice R. Robert ◽  
Himavathi Ganja ◽  
Suresh Maddila ◽  
Sreekantha B. Jonnalagadda
Keyword(s):  
Ultrasonic Irradiation ◽  
Catalyst Free ◽  
Environmental Friendly

On water: catalyst-free chemoselective synthesis of highly functionalized tetrahydroquinazolines from 2-aminophenylacrylate

2015 ◽  
Vol 17 (3) ◽  
pp. 1434-1441 ◽  
Author(s):  
Rakesh K. Saunthwal ◽  
Monika Patel ◽  
Rakesh K. Tiwari ◽  
Keykavous Parang ◽  
Akhilesh K. Verma
Keyword(s):  
Free Atom ◽  
Catalyst Free ◽  
Environmental Friendly ◽  
Chemoselective Synthesis

A green and catalyst free atom-ecomonic straightforward tandem approach for the synthesis of highly functionalized tetrahydroquinazolines by the reaction of 2-aminophenylacrylate 1 with isothiocyanates 2 using water as an environmental friendly solvent is described.

A room temperature synthesizable and environmental friendly heterogeneous ZIF-67 catalyst for the solvent less and co-catalyst free synthesis of cyclic carbonates

2016 ◽  
Vol 182 ◽  
pp. 562-569 ◽  
Author(s):  
Roshith Roshan Kuruppathparambil ◽  
Tharun Jose ◽  
Robin Babu ◽  
Gyu-Young Hwang ◽  
Amal Cherian Kathalikkattil ◽  
...  
Keyword(s):  
Room Temperature ◽  
Cyclic Carbonates ◽  
Co Catalyst ◽  
Catalyst Free ◽  
Environmental Friendly

Production of Asbestos-free Brake Pad Using Groundnut Shell as Filler Material

2018 ◽  
Vol 4 (12) ◽  
Author(s):  
W. C. Solomon ◽  
M. T. Lilly ◽  
J. I. Sodiki
Keyword(s):  
Phenolic Resin ◽  
Cost Effective ◽  
Filler Material ◽  
Particle Sizes ◽  
Brake Pad ◽  
Brake Pads ◽  
Environmental Friendly ◽  
Sieve Size ◽  
Groundnut Shell ◽  
The Cost

The development and evaluation of brake pads using groundnut shell (GS) particles as substitute material for asbestos were carried out in this study. This was with a view to harnessing the properties of GS, which is largely deposited as waste, and in replacing asbestos which is carcinogenic in nature despite its good tribological and mechanical properties. Two sets of composite material were developed using varying particle sizes of GS as filler material, with phenolic resin as binder with percentage compositions of 45% and 50% respectively. Results obtained indicate that the compressive strength and density increase as the sieve size of the filler material decreases, while water and oil absorption rates increase with an increase in sieve size of GS particle. This study also indicates that the cost of producing brake pad can be reduced by 19.14 percent if GS is use as filler material in producing brake pad. The results when compared with those of asbestos and industrial waste showed that GS particle can be used as an effective replacement for asbestos in producing automobile brake pad. Unlike asbestos, GS-based brake pads are environmental friendly, biodegradable and cost effective.

Metal-Free Photoinduced Hydroalkylation Cascade Enabled by an Electron-Donor-Acceptor Complex

2020 ◽  
Author(s):  
José Tiago Menezes Correia ◽  
Gustavo Piva da Silva ◽  
Camila Menezes Kisukuri ◽  
Elias André ◽  
Bruno Pires ◽  
...  
Keyword(s):  
Electron Donor ◽  
Functional Group ◽  
Photoexcited Electron ◽  
One Pot ◽  
Quaternary Centers ◽  
Metal Free ◽  
Acceptor Complex ◽  
Catalyst Free ◽  
Donor Acceptor ◽  
Radical Cascade

A metal- and catalyst-free photoinduced radical cascade hydroalkylation of 1,7-enynes has been disclosed. The process is triggered by a SET event involving a photoexcited electron-donor-aceptor complex between NHPI ester and Hantzsch ester, which decomposes to afford a tertiary radical that is readily trapped by the enyne. <a>The method provides an operationally simple, robust and step-economical approach to the construction of diversely functionalized dihydroquinolinones bearing quaternary-centers. A sequential one-pot hydroalkylation-isomerization approach is also allowed giving access to a family of quinolinones. A wide substrate scope and high functional group tolerance was observed in both approaches</a>.

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