Organocatalysis is the most recent type of catalysis where small organic molecules called organocatalysts are applied to catalyze organic reactions. Organocatalysts usually are a greener approach when compared to organometallic catalysts, cheaper, easier to synthesize and handle and not air or humidity sensitive. Furthermore, the combination of organocatalysis with the use of microwave technology abides by the Green Chemistry and Sustainability principles.
In the past few years, we have been applying N-heterocyclic carbenes as organocatalysts in various reactions of aromatic and aliphatic aldehydes using microwave irradiation. The results of these endeavors are very interesting, especially when we can isolate products that could not be synthesized using conventional heating.

Microwave-Assisted Organocatalysis by N-Heterocyclic Carbenes
References
1.
A. Nikolaou, G. Kokotos, V. Magrioti Tetrahedron 2016, 72, 7628-7632.
2.
E. Papadaki, L. Delaude, V. Magrioti, Tetrahedron 2017, 73, 7295-7300.
3. E. Papadaki, V. Magrioti, Tetrahedron Lett. 2020, 61, 151419.