UV light-mediated difunctionalization of alkenes with CF3SO2Na: synthesis of trifluoromethyl phenanthrene and anthrone derivatives

2016 ◽  
Vol 14 (23) ◽  
pp. 5293-5297 ◽  
Author(s):  
Bing Li ◽  
Dan Fan ◽  
Chao Yang ◽  
Wujiong Xia
Keyword(s):  
Uv Light ◽  
Cost Effective ◽  
Metal Free

A metal-free and cost-effective protocol for UV light-mediated difunctionalization of alkenes with CF3SO2Na was developed.

Facile Access to Triazole-Fused 3,1-Benzoxazines Enabled by Metal-Free Base-Promoted Intramolecular C–O Coupling

Synthesis ◽  
2021 ◽  
Author(s):  
Yury N. Kotovshchikov ◽  
Stepan S. Tatevosyan ◽  
Gennadij V. Latyshev ◽  
Nikolay V. Lukashev ◽  
Irina P. Beletskaya
Keyword(s):  
Transition Metal ◽  
Functional Group ◽  
Cost Effective ◽  
Reductive Cleavage ◽  
Effective Procedure ◽  
Free Base ◽  
Metal Free ◽  
Fused Heterocycles ◽  
Convenient Approach

AbstractA convenient approach to assemble 1,2,3-triazole-fused 4H-3,1-benzoxazines has been developed. Diverse alcohol-tethered 5-iodotriazoles, readily accessible by a modified protocol of Cu-catalyzed (3+2)-cycloaddition, were utilized as precursors of the target fused heterocycles. The intramolecular C–O coupling proceeded efficiently under base-mediated transition-metal-free conditions, furnishing cyclization products in yields up to 96%. Suppression of the competing reductive cleavage of the C–I bond was achieved by the use of Na2CO3 in acetonitrile at 100 °C. This practical and cost-effective procedure features a broad substrate scope and valuable functional group tolerance.

scholarly journals Green Chemical Synthesis of N-Cholyl-L-Cysteine Encapsulated Gold Nanoclusters For Fluorometric Detection of Mercury Ions

2021 ◽  
Author(s):  
Kasthuri Jayapalan ◽  
Sivasamy Arumugam ◽  
Rajendiran Nagappan
Keyword(s):  
Uv Light ◽  
Stokes Shift ◽  
Gold Nanoclusters ◽  
Green Emission ◽  
Fluorescence Analysis ◽  
Cost Effective ◽  
Single Step ◽  
Fluorometric Detection ◽  
Transmission Electron ◽  
Green Chemical Synthesis

Abstract Here we report a simple, single-step, cost-effective, environmentally friendly, and biocompatible approach using sodium salt of N-cholyl-L-cysteine (NaCysC) capped gold nanoclusters (AuNCs) with green emission properties at above the CMC in aqueous medium under UV-light irradiation. The primary and secondary CMC of NaCysC was found to be 4.6 and 10.7 mM respectively using pyrene as fluorescent probe. The synthesized AuNCs exhibit strong emission maxima at 520 nm upon excitation of 375 nm with a large Stokes shift of 145 nm. The surface functionality and morphology of NCs are studied by Fourier transform infrared spectroscopy, dymanic light scattering studies and transmission electron microscopy. The formation of AuNCs was completed within 5 h and exhibit high stability for more than 6 months. The NaCysC templated AuNCs selectively quenches the Hg2+ ions with higher sensitivity in aqueous solution over the other metal ions. The fluorescence analysis of Hg2+ showed a wide linear range from 15 to 120 µM and a detection limit was found to be 15 nM.

A Photo-Desmear Method for Via Residue Removal Using a VUV Light Source

2013 ◽  
Vol 2013 (1) ◽  
pp. 000492-000495 ◽  
Author(s):  
Tomoyuki Habu ◽  
Shintaro Yabu ◽  
Kenichi Hirose ◽  
Hiroki Horibe ◽  
Toru Fujinami ◽  
...  
Keyword(s):  
Vacuum Ultraviolet ◽  
Uv Light ◽  
Cost Effective ◽  
Dielectric Surface ◽  
Surface Cleaning ◽  
Electrical Performance ◽  
Copper Plating ◽  
Chemical Waste ◽  
Residue Removal ◽  
Photochemical Decomposition

The desmear process of removing via residue after laser drill in substrate manufacturing is a critical step for reliability and electrical performance. Cost effective and environmentally clean desmear processes are industry-wide objectives, as the current wet desmear process results in significant chemical waste and regular bath replacement. Here, we evaluated an effective photo desmear method targeting a low total cost of ownership and negligible environmental impact. This method achieves residue and silica free via bottoms with the use of 172nm vacuum ultraviolet light (VUV) photo-chemical ashing followed by water clean. Studies of organic molecular photochemical decomposition by short wavelength UV light are widely reported and have been applied for purposes such as surface cleaning and improving wettability and are naturally extendable to via residue removal. Scanning electron microscope (SEM) and energy dispersed X-ray spectroscopy (EDX) reveal that the application of VUV desmear results in residue free microvia without negatively affecting via shape or the dielectric surface. In addition, the surface remains highly wettable, which aids downstream copper plating. The high reaction rate, absence of wet chemistry, and creation of surfaces amenable for subsequent copper plating make this dry desmear process a strong candidate for future applications in substrate manufacturing.

Efficient hydrogen peroxide synthesis by metal-free polyterthiophene via photoelectrocatalytic dioxygen reduction

2020 ◽  
Vol 13 (1) ◽  
pp. 238-245 ◽  
Author(s):  
Wenjun Fan ◽  
Bingqing Zhang ◽  
Xiaoyu Wang ◽  
Weiguang Ma ◽  
Deng Li ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Oxygen Reduction ◽  
Cost Effective ◽  
High Concentration ◽  
Metal Free ◽  
Dioxygen Reduction ◽  
Polymeric Semiconductor ◽  
Hydrogen Peroxide Synthesis

We demonstrate the metal-free polymeric semiconductor pTTh as a selective and efficient photocathode for photoelectrochemical oxygen reduction to a high concentration of H2O2 in a cost-effective way.

A photo-auxiliary approach – enabling excited state classical phototransformations with metal free visible light irradiation

2017 ◽  
Vol 53 (10) ◽  
pp. 1692-1695 ◽  
Author(s):  
Akila Iyer ◽  
Steffen Jockusch ◽  
Jayaraman Sivaguru
Keyword(s):  
Excited State ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Uv Light ◽  
Light Irradiation ◽  
Metal Free ◽  
High Yields

To address the problem of using UV light to initiate traditional photoreactions, hydrazide based chromophores are evaluated as a “photo-auxiliary“ with visible light using a metal free photocatalyst to afford photoproducts in high yields.

Metal-free direct construction of sulfenylated pyrazoles via the NaOH promoted sulfenylation of pyrazolones with aryl thiols

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 51830-51833 ◽  
Author(s):  
Xiaoxia Liu ◽  
Huanhuan Cui ◽  
Daoshan Yang ◽  
Shicui Dai ◽  
Tiantian Zhang ◽  
...  
Keyword(s):  
Cost Effective ◽  
Direct Construction ◽  
Metal Free

A convenient and cost-effective NaOH-promoted direct sulfenylation of pyrazolones with aryl thiols has been developed under mild and metal-free conditions.

Metal-free synthesis of ketones by visible-light induced aerobic oxidative radical addition of aryl hydrazines to alkenes

2017 ◽  
Vol 19 (13) ◽  
pp. 2941-2944 ◽  
Author(s):  
Ya Ding ◽  
Wenkai Zhang ◽  
Hao Li ◽  
Yunge Meng ◽  
Te Zhang ◽  
...  
Keyword(s):  
Visible Light ◽  
Cost Effective ◽  
Radical Addition ◽  
Metal Free ◽  
Cost Effective Method

A green and cost-effective method has been developed for the conversion of alkenes to ketones under metal-free conditions.

scholarly journals Cost-Effective Disinfection Robot Using UVC Radiation

2021 ◽  
Vol 40 ◽  
pp. 02003
Author(s):  
Mansi Dhikle ◽  
Vinaya Dharne ◽  
Pankaja Gaikar ◽  
Kausar Fakir
Keyword(s):  
Video Streaming ◽  
Uv Light ◽  
Low Cost ◽  
Cost Effective ◽  
Live Video ◽  
Medical Facilities ◽  
Ultraviolet C ◽  
Cleaning Robots ◽  
Uv C ◽  
Uvc Radiation

Sanitization with human efforts is not an easy task. Chances of contracting infections increases which leads to additional spread of bacteria. Currently, normal cleaning robots are used in most of the places but looking at the current situation the sanitization techniques need to be improved. The robot uses radiation of UV rays to kill the microrganisms. It gives a live video streaming of its surrounding using a Wi-fi based camera. With the help of Bluetooth module and android mobile, we can control the movement of the robot inside the room without being physically present. It is built with PIC Microcontroller and Ultraviolet-C (UVC) Sanitization LED. UV-C has bandwidth range of 200-280nm and is most powerful when it comes to killing pathogens in the room. This allows us to sterilise the room effectively. By killing the germs, the UV light restricts their multiplication by destroying their reproductive system. Thus use of this robot lowers the threat of infection, cost of traditional cleaning and sterilisation and increases security in medical facilities. Thus, we are trying to implement a more efficient way of sanitization by building a Low cost UV sanitization Robot which can be used in small clinics and for household purpose.

scholarly journals Improvement of Impact Strength of Polylactide Blends with a Thermoplastic Elastomer Compatibilized with Biobased Maleinized Linseed Oil for Applications in Rigid Packaging

Molecules ◽  
2021 ◽  
Vol 26 (1) ◽  
pp. 240
Author(s):  
Ramon Tejada-Oliveros ◽  
Rafael Balart ◽  
Juan Ivorra-Martinez ◽  
Jaume Gomez-Caturla ◽  
Nestor Montanes ◽  
...  
Keyword(s):  
Impact Strength ◽  
Uv Light ◽  
Linseed Oil ◽  
Research Work ◽  
Thermoplastic Elastomer ◽  
Cost Effective ◽  
Standard Samples ◽  
Yellow Colour ◽  
Elongation At Break ◽  
Packaging Industry

This research work reports the potential of maleinized linseed oil (MLO) as biobased compatibilizer in polylactide (PLA) and a thermoplastic elastomer, namely, polystyrene-b-(ethylene-ran-butylene)-b-styrene (SEBS) blends (PLA/SEBS), with improved impact strength for the packaging industry. The effects of MLO are compared with a conventional polystyrene-b-poly(ethylene-ran-butylene)-b-polystyrene-graft-maleic anhydride terpolymer (SEBS-g-MA) since it is widely used in these blends. Uncompatibilized and compatibilized PLA/SEBS blends can be manufactured by extrusion and then shaped into standard samples for further characterization by mechanical, thermal, morphological, dynamical-mechanical, wetting and colour standard tests. The obtained results indicate that the uncompatibilized PLA/SEBS blend containing 20 wt.% SEBS gives improved toughness (4.8 kJ/m2) compared to neat PLA (1.3 kJ/m2). Nevertheless, the same blend compatibilized with MLO leads to an increase in impact strength up to 6.1 kJ/m2, thus giving evidence of the potential of MLO to compete with other petroleum-derived compatibilizers to obtain tough PLA formulations. MLO also provides increased ductile properties, since neat PLA is a brittle polymer with an elongation at break of 7.4%, while its blend with 20 wt.% SEBS and MLO as compatibilizer offers an elongation at break of 50.2%, much higher than that provided by typical SEBS-g-MA compatibilizer (10.1%). MLO provides a slight decrease (about 3 °C lower) in the glass transition temperature (Tg) of the PLA-rich phase, thus showing some plasticization effects. Although MLO addition leads to some yellowing due to its intrinsic yellow colour, this can contribute to serving as a UV light barrier with interesting applications in the packaging industry. Therefore, MLO represents a cost-effective and sustainable solution to the use of conventional petroleum-derived compatibilizers.

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