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Title: Silica grafted polyethylenimine as heterogeneous catalyst for condensation reactions
Authors: Ribeiro, Sonia M. 
Serra, Arménio. C. 
Gonsalves, A. M. d’A. Rocha 
Keywords: Polyethylenimine; Silica; Heterogeneous catalysts; Knoevenagel condensation
Issue Date: 2010
Publisher: Elsevier
Serial title, monograph or event: Applied Catalysis A: General
Abstract: Primary amine groups were attached to a silica surface by using α,ω-diamines derivatives and (3-glycidyloxypropyl)-trimethoxysilane activation. The same activation was used to graft polyethylenimine, which also contains secondary and tertiary amine groups. These silica aminated structures were tested as heterogeneous catalysts in nitroaldol condensation with nitromethane, the derivative with the polyethylenimine moiety being the more active catalyst. This catalyst also showed efficiency in the Knoevenagel condensation of benzaldehydes with ethyl cyanoacetate under very mild reaction conditions and showed much the same efficiency when used in consecutive reaction runs. A reaction mechanism with participation of the several amine groups of the catalysts is discussed.
ISBN: 10.1016/j.apcata.2011.03.054
ISSN: 0926-860X
DOI: 10.1016/j.apcata.2011.03.054
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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