A Review On: A Significance of Microwave Assist Technique in Green Chemistry

Abstract

<p><strong> </strong>Microwave Assisted Synthesis is rapidly becoming the method of choice in modern synthesis and discovery chemistry laboratories. Microwave-assisted synthesis improves both throughput and turn-around time for chemists by offering the benefits of drastically reduced reaction times, increased yields, and purer products. In this type of synthesis<strong> </strong>we applying <a href="http://en.wikipedia.org/wiki/Microwave">microwave</a> irradiation to chemical reactions. The fundamental mechanism of microwave heating involves agitation of polar molecules or ions that oscillate under the effect of an oscillating electric or magnetic field. In the presence of an oscillating field, particles try to orient themselves or be in phase with the field. Only materials that absorb microwave radiation are relevant to microwave chemistry. These materials can be categorized according to the three main mechanisms of heating, namely. Dipolar polarization, Conduction mechanism, Interfacial polarization. Microwave chemistry apparatus are classified: Single-mode apparatus and Multi-mode apparatus. Although occasionally known by such acronyms as 'MEC' (Microwave-Enhanced Chemistry) or ‘MORE’<em> </em>synthesis (Microwave-organic Reaction Enhancement), these acronyms have had little acceptance outside a small number of groups. The ability to combine microwave technology with in-situ reaction monitoring as an analytical tools will offer opportunities for chemists to optimize the reaction conditions. Different compounds convert microwave radiation to heat by different amounts. This selectivity allows some parts of the object being heated to heat more quickly or more slowly than others (particularly the reaction vessel).</p

Comparative Magnetic Studies in the Solid State and Solution of Two Isostructural 1D Coordination Polymers Containing CoII/NiII-Curcuminoid Moieties

“…Coordination polymers 1 and 2 have been achieved by the use of solvothermal [23] and microwave (MW)-assisted [24] methods, both well-applied to attain mononuclear systems [20,22] and higher-dimensional structures [21,23]. MW-assisted techniques have been used previously in the group and have been described in the past as an effective tool toward the achievement of crystals directly from the reaction.…”

Green Chemistry Approach for Efficient Synthesis of Schiff Bases of Isatin Derivatives and Evaluation of Their Antibacterial Activities

“…These materials can be categorized according to the three main mechanisms of heating such as dipolar polarization, conduction mechanism, and interfacial polarization. The technique offers simple, clean, fast, efficient, and economical for the synthesis of a large number of drug molecules, having provided the momentum for many medicinal chemists to switch from traditional heating method to microwave heating method [1,2]. Thus it follows green chemistry approach.…”

“…The paper titled "Green Chemistry Approach for Efficient Synthesis of Schiff Bases of Isatin Derivatives and Evaluation of Their Antibacterial Activities" [1], published in Journal of Nanoparticles, has been retracted as it was accepted for publication on the basis of peer review reports that were submitted from fraudulent reviewer accounts.…”

Chitosan as biosupport for the MW-assisted synthesis of palladium catalysts and their use in the hydrogenation of ethyl cinnamate

“…In fact, microwaves represent one of the most efficient, cost-effective and powerful tool for conducting processes and afford remarkable rate enhancement, higher yields, greater selectivity and ease of reaction's manipulation [25][26][27][28][29][30][31][32]. Microwave irradiation results into almost instantaneous 'in core' heating of materials in a homogeneous and selective manner and can allow rapid transfer of the energy into bulk of the reaction mixture, eliminating the wall effects [31,32].…”