An Environment Friendly Preparation of 3-Bromocamphor and Camphorquinone

2012 ◽  
Vol 36 (3) ◽  
pp. 141-143 ◽  
Author(s):  
Jayaraman Kannappan ◽  
Ashutosh V. Bedekar
Keyword(s):  
Sodium Carbonate ◽  
Ammonium Iodide ◽  
Environment Friendly ◽  
Tetrabutyl Ammonium Iodide ◽  
Tetrabutyl Ammonium

The bromination of camphor has been carried out on a multi-gram scale by a mixture of KBr and KBrO3 in the presence of acid or with HBr/NaBr - H+ and H2O2/oxone® as the oxidant. The 3-bromocamphor is then efficiently converted to camphorquinone by an improved oxidation protocol using DMSO and sodium carbonate of tetrabutyl ammonium iodide.

Investigation of photovoltaic properties of nanostructure indoline dye-sensitised solar cells using changes in assembling materials

2017 ◽  
Vol 46 (5) ◽  
pp. 393-398 ◽  
Author(s):  
Mozhgan Hosseinnezhad ◽  
Kamaladin Gharanjig
Keyword(s):  
Solar Cells ◽  
Organic Dyes ◽  
Low Cost ◽  
Photovoltaic Performance ◽  
Ammonium Iodide ◽  
Photovoltaic Properties ◽  
Content Type ◽  
Tetrabutyl Ammonium Iodide ◽  
Tetrabutyl Ammonium ◽  
First Time

Purpose The purpose of this paper is to study assembling parameters in dye-sensitised solar cells (DSSCs) performance. For this end, 3a,7a-dihydroxy-5ß-cholanic acid (cheno) are selected as anti-aggregation agent and two solutions, namely, tetrabutyl ammonium iodide and (PMII)IL used as electrolyte. Design/methodology/approach A series of organic dyes were selected using N-substituents carbazole as electron donor group and acrylic acid and cyanoacrylic acid as electron acceptor groups. Absorption properties of purified dyes were studied in solution and on photoelectrode substrate. DSSCs were prepared in the presence of anti-aggregation agent and different electrolyte to determine the photovoltaic performance of each dyes. Findings The results showed that all organic dyes form J-aggregation on the photoanode substrate in the absence of anti-aggregation agent and the amounts of aggregation were reduced in the presence of anti-aggregation agent. DSSCs were fabricated in the presence of anti-aggregation agent. The photovoltaic properties were improved using tetrabutyl ammonium iodide as electrolyte. The maximum power conversion efficiency was achieved for D12 in the presence of cheno and tetrabutyl ammonium iodide as anti-aggregation agent and electrolyte, respectively. Social implications Organic dye attracts more and more attention due to low cost, facile route synthesis and less hazardous. Originality/value The effect of anti-aggregation agent and electrolyte on DSSCs performance was investigated for the first time.

A chemoselective α-aminoxylation of aryl ketones: a cross dehydrogenative coupling reaction catalysed by Bu4NI

2015 ◽  
Vol 13 (48) ◽  
pp. 11651-11656 ◽  
Author(s):  
Yogesh Siddaraju ◽  
Kandikere Ramaiah Prabhu
Keyword(s):  
Coupling Reaction ◽  
Ammonium Iodide ◽  
Tetrabutyl Ammonium Iodide ◽  
Dehydrogenative Coupling ◽  
Tetrabutyl Ammonium ◽  
Aryl Ketones

Tetrabutyl ammonium iodide (TBAI) catalyzed α-aminoxylation of ketones using aq. TBHP as an oxidant has been accomplished.

Construction of Safe, Reliable, Clean, and Environment-Friendly Refining and Chemical Enterprises

2019 ◽  
Vol 21 (2) ◽  
pp. 111
Author(s):  
Shucai Zhang ◽  
Xiaohua Zhang ◽  
Ping Jia ◽  
Qian Wang ◽  
Xianghong Cao
Keyword(s):  
Environment Friendly

Mikania micrantha mixed woven fabric for quick blood clotting and wound healing

2020 ◽  
Vol 6 (5) ◽  
Author(s):  
Shaikh Md Mominul Alam ◽  
Shilpi Akter ◽  
Md Lutfor Rahman
Keyword(s):  
Wound Healing ◽  
Blood Clotting ◽  
Woven Fabric ◽  
Excessive Bleeding ◽  
Sustainable Operations ◽  
Environment Friendly ◽  
Mikania Micrantha ◽  
Leaf Powder ◽  
Medical Textile ◽  
Dressing Materials

The aim of this paper is to introduce novel dressing with Mikania Micrantha for quick blood clotting and wound healing. When epidermis of human skin is cut or scrapped, sometimes too much bleeding occurs. Excessive bleeding may cause death, if bleeding is not stopped immediately. To promote blood clotting & wound healing natural based bio materials are still insufficient in medical textile sector. To fill up this scarcity, woven fabric treated with Mikania micrantha leaf juice & leaf powder was examined. M. micrantha exhibits good blood clotting time in comparison with available dressing materials. Woven fabric (bandage) that contains M. micrantha can be used for cut wounds healing purpose. The experiments were carried out in environment friendly way which indicates the production & processing of these dressing materials can have enormous contribution to sustainable operations and products.

ENVIRONMENT-FRIENDLY COMPOSITE PROPELLANTS BASED ON AMMONIUM DINITRAMIDE

2019 ◽  
Vol 18 (1) ◽  
pp. 31-49
Author(s):  
Volker Gettwert ◽  
Volker Weiser ◽  
Claudio Tagliabue ◽  
Sven Hafner ◽  
Sebastian Fischer
Keyword(s):  
Ammonium Dinitramide ◽  
Environment Friendly

Dissolution and Performing Homogeneous Photocatalysis of Polymeric Carbon Nitride

2018 ◽  
Author(s):  
Chaofeng Huang ◽  
Jing Wen ◽  
Yanfei Shen ◽  
Fei He ◽  
Li Mi ◽  
...  
Keyword(s):  
Conjugated Polymer ◽  
Carbon Nitride ◽  
Heterogeneous Catalysts ◽  
Methane Sulfonic Acid ◽  
Environment Friendly ◽  
The Poor ◽  
Catalytic Sites ◽  
Homogeneous Photocatalysis ◽  
Polymeric Carbon ◽  
First Time

<a></a><a>As a metal-free conjugated polymer, carbon nitride (CN) has attracted tremendous attention as heterogeneous (photo)catalysts. </a><a></a><a>By following prototype of enzymes, making all catalytic sites of accessible via homogeneous reactions is a promising approach toward maximizing CN activity, but hindered due to </a><a></a><a>the poor insolubility of CN</a>. Herein, we report the dissolution of CN in environment-friendly methane sulfonic acid and the homogeneous photocatalysis driven by CN for the first time with the activity boosted up to 10-times, comparing to the heterogeneous counterparts. Moreover, facile recycling and reusability, the <a>hallmark</a> of heterogeneous catalysts, were kept for the homogeneous CN photocatalyst via reversible precipitation using poor solvents. It opens new vista of CN in homogeneous catalysis and offers a successful example of polymeric catalysts in bridging gaps of homo/heterogeneous catalysis.

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