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|Type:||Artigo de periódico|
|Title:||Ultrasound in Baylis-Hillman reactions with aliphatic and aromatic aldehydes: scope and limitations|
|Abstract:||The utilization of ultrasound radiation in the Baylis-Hillman reaction with several aldehydes (aromatics and aliphatics) and different alpha,beta-unsaturated reactants is described. For all aldehydes tested, the utilization of ultrasound sources augmented the reaction rate and the chemical yields. The use of ultrasound with two different catalysts (tri-n-butylphosphine and 1,4-diazabicyclo[2.2.2] octane [DABCO]) was also investigated. It was clearly demonstrated that DABCO is much more effective for catalyzing a Baylis-Hillman reaction under the influence of ultrasound than is tri-n-butylphosphine. No effect on reaction rate was observed when the concentration of DABCO was increased. (C) 2002 Elsevier Science Ltd. All rights reserved.|
1,4-diazabicyclo[2.2.2] octane (DABCO)
|Editor:||Pergamon-elsevier Science Ltd|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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