Aqueous Microwave Assisted Chemistry: Synthesis and by Rajender S. Varma, Vivek Polshettiwar

By Rajender S. Varma, Vivek Polshettiwar

The calls for for eco-friendly and sustainable artificial equipment within the fields of healthcare and superb chemical substances, mixed with the strain to provide those elements expeditiously and in an environmentally benign type, pose major demanding situations to the bogus chemical group. eco-friendly chemistry can keep away from pollutants through the use of concepts which are environmentally pleasant via layout and the most effective eco-friendly thoughts is using microwave (MW) assisted aqueous man made protocols. Fusing MW strategy with water (as a benign response medium) can supply a rare synergistic impact with higher power than those person elements in isolation. Selective microwave heating could be exploited to enhance a excessive yield protocol and using water expedites the MW-protocol with extra power potency. This e-book presents an outline of many of the tactics built utilizing aqueous microwave chemistry and is written for chemists, chemical engineers and researchers within the early levels who are looking to increase sustainable and eco-friendly techniques. Written via renowned microwave specialists, the publication is a entire exam of the sector and is the 1st ebook that offers strictly with aqueous microwave chemistry and represents an important attempt in the direction of eco-friendly chemistry. It covers all of the microwave-assisted aqueous reactions intensive, together with heterocycle synthesis, steel catalysis, enzyme catalysis, polymer synthesis, nanomaterials synthesis and nano-catalysis. each one bankruptcy includes consultant experimental approaches, supporting the reader fast mirror many of the experiments to achieve hands-on event.

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Additional info for Aqueous Microwave Assisted Chemistry: Synthesis and Catalysis (RSC Green Chemistry Series)

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69 Reactions were completed in less than 1 min, affording the six-membered ring systems 15 in excellent yields (92–99%) and with good stereoselectivity (endo/exo ratio from 78 : 22 to 100 : 0). However, we must note that, under the same reaction conditions, the use of the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF6) as solvent instead water resulted in even faster reactions (30 s). Probably the most important contribution of microwaves to cycloaddition chemistry has been in the field of 1,3-dipolar cycloadditions of azides with alkynes and alkenes.

8) under an oxygen atmosphere (1 atm), produced DMSO2 quantitatively after 3 h of MW heating at 200 1C. Combined with MW-absorbing materials, such as granular activated carbon (GAC), microwave irradiation has been extensively used in the treatment of wastewater. 94–96 In particular, copper94,95 or platinum96 particles dispersed onto the surface of GAC can act as reaction centers for the degradation of paranitrophenol (PNP) and pentachlorophenol (PCP). 6 wt% of Cu or Pt), under ambient pressure and continuous flow mode using a microwave field of 160–850 W.

36 As a general trend, alkynols with electron-withdrawing groups on the aryl substituents were less reactive than those with electron-rich substrates, requiring longer reaction times to reach satisfactory conversions. Remarkably, starting from secondary alcohols (R2 ¼ H) the corresponding enals were formed with complete (E )-stereoselectivity. It is also notable that the scope of the reaction is not restricted to substrates bearing terminal CRC bonds; internal propargylic alcohols (R3 ¼ Me, Ph) are also efficiently transformed into the corresponding enones.

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