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Type: Artigo de periódico
Title: Ultrasound in Baylis-Hillman reactions with aliphatic and aromatic aldehydes: scope and limitations
Author: Coelho, F
Almeida, WP
Veronese, D
Mateus, CR
Lopes, ECS
Rossi, RC
Silveira, GPC
Pavam, CH
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.
Subject: Baylis-Hillman reaction
alpha,beta-unsaturated compounds
1,4-diazabicyclo[2.2.2] octane (DABCO)
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/S0040-4020(02)00822-0
Date Issue: 2002
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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