Journal
TETRAHEDRON LETTERS
Volume 47, Issue 14, Pages 2423-2425Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2006.01.147
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An energy-efficient protocol has been developed for solvent-free reactions that are mildly exothermic but not spontaneous. The exothermic reaction mixture-on several g-scale-is exposed For about 30 s to low power (about 200 W) microwaves and then the microwave oven is switched off. After this short burst of energy, the exothermic reaction gets initiated and proceeds on its own to completion. A number of coumarins were synthesized by the Pechmann reaction using this strategy. (c) 2006 Elsevier Ltd. All rights reserved.
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