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Reactions performed under microwave irradiation offer many advantages when compared to conventional ones, including short reaction times, high yields, controlled selectivity, and low energy consumption, as well as the possibility to perform solvent-free transformations with lower production of residues under safer and more environmentally benign conditions. In this mini-review, we describe several examples of reactions performed since 2006 in a monomode microwave reactor, located at MESO-Lab (Laboratory of Organic Synthesis and Methodology, Chemistry Department, UFSC), by our research group as well as by others from Brazil and Uruguay. The reactions described herein are organized into topics according to whether the main step involves the formation (or cleavage) of C-N, CO or CC bonds.

Organo-selenium compounds S 0130Addition of Chalcogenolate Anions to Terminal Alkynes Using Microwave and Solvent-Free Conditions: Easy Access to Bis-organochalcogen Alkenes. -The new methodology uses NaBH4 impregnated on aluminum oxide as a suitable reagent system. The products are of interest as precursors of functionalized olefin substrates. -(PERIN*, G.; JACOB, R. G.; DUTRA, L. G.; DE AZAMBUJA, F.; DOS SANTOS, G. F. F.; LENARDAO, E. J.; Tetrahedron Lett. 47 (2006) 6, 935-938; Inst. Quim. Geocienc., Univ. Fed. Pelotas, 96010 Pelotas, RS, Brazil; Eng.) -Mais 20-181