Chemical reactions ultrasound-assisted

Diels-Alder Reaction Facilitated by Physical and Chemical Methods 155 Table 4.8 o-Quinone ultrasound-assisted Diels-Alder reactions... 

Microwave heating has already been used in combination with some other (unconventional activation processes. Such a combination might have a synergic effect on reaction efficiencies or, at least, enhance them by combining their individual effects. Application of MW radiation to ultrasound-assisted chemical processes has been recently described by some authors [18, 19]. Mechanical activation has also been successfully combined with MW heating to increase chemical yields of several reactions [1]. 

Figure 3.54 Conceptual view of integrated microflow system employing FPW pumps, mixer, process sensor and insonicator to produce ultrasound-assisted chemical reactions. Heater would be deposited metal or polysilicon meanderline formed on a surface of the chamber.

Ultrasound-assisted liquid sample preparation involving chemical reactions... 

Figure 2.4. Commercial discrete devices for chemical reactions assisted by ultrasound probes. (A) Rosett cell, (B) indented cell, (C) Suslick cell and (D) cup horn.

Efforts have been made to accelerate the reaction. Ionic liquids can be obtained in < 1 min using microwave-assisted preparation, and ultrasound-assisted synthesis leads to the rapid isolation of ionic liquids with high chemical purity. If a microwave reactor with reaction condition control mechanisms is used, ionic liquids can be conveniently prepared even on a large scale (up to 2 moles), both in high yields and with short reaction times. ... 

---