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vol.16 issue4Hydrogen bonds between pyrazine and HX linear acids (X = F, NC, CN and CCH): a theoretical studyClean and atom-economic synthesis of alpha-phenylselenoacrylonitriles and alpha-phenylseleno- alpha,beta-unsaturated esters by knoevenagel reaction under solvent-free conditions author indexsubject indexarticles search
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Journal of the Brazilian Chemical Society

Print version ISSN 0103-5053On-line version ISSN 1678-4790


SAGRERA, Gabriel J.  and  SEOANE, Gustavo A.. Microwave accelerated solvent-free synthesis of flavanones. J. Braz. Chem. Soc. [online]. 2005, vol.16, n.4, pp.851-856. ISSN 0103-5053.

Microwave irradiation of chalcones under solvent-free conditions resulted in a "green-chemistry" procedure for the preparation of flavanones in very good yields. Using an unmodified household microwave oven, different mineral supports and catalysts were tested. By irradiation of chalcones with 30% TFA over silica gel, eleven known flavanones and five new compounds were prepared in high yields.

Keywords : cyclization; flavanones; Michael addition; microwave; silica gel.

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