Abstract
This brief article reviews the behavior of microwaves in organic syntheses from the viewpoint of the frequency effect, which has been examined on various common solvents with a newly fabricated 5.80-GHz microwave organic synthesis apparatus, whose features are compared with a similar 2.45-GHz microwave apparatus. Results from usage of the 5.80-GHz microwaves are also compared to the more frequently used MW frequency of 2.45 GHz. The frequency effect was examined for various organic reactions such as the Diels-Alder reaction, the synthesis of benzimidazole-based room-temperature ionic liquids, and the Suzuki-Miyaura coupling reaction. Non-polar solvents can prove particularly useful in organic reactions with the higher frequency microwaves. In this regard, further experiments on microwave-assisted organic syntheses will extend our understanding of the microwave frequency effect(s).
Keywords: Microwave organic synthesis, Frequency effect, 5.8 GHz, Ionic liquid, Suzuki-Miyaura coupling reaction, microwave organic synthesis apparatus, Diels-Alder reaction
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