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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 9
BKCSDE 31(9)
September 20, 2010 

 
Title
Synthesis, Characterization and Application of Poly(4-Methyl Vinylpyridinium Hydroxide)/SBA-15 Composite as a Highly Active Heterogeneous Basic Catalyst for the Knoevenagel Reaction
Author
Roozbeh Javad Kalbasi*, Majid Kolahdoozan*, Ahmadreza Massah, Keinaz Shahabian
Keywords
Knoevenagel condensation, Ethyl cyanoacetate, P4MVPH/SBA-15, Green method, H2O
Abstract
In this paper poly (4-methyl vinylpyridinium hydroxide)/SBA-15 composite was prepared as a highly efficient heterogeneous basic catalyst by in situ polymerization method for the first time. It was characterized by XRD, FT-IR, BET, TGA, SEM and back titration using NaOH. This catalyst exhibited the excellent catalytic activities for the Knoevenagel condensation of various aldehydes with ethyl cyanoacetate. Over this catalyst, α,β-unsaturated carbonyl compounds were obtained in the reasonable yield at 95 oC in 10 - 30 min in H2O as a solvent with a 100% selectivity to the condensation products. Catalyst could be easily recycled after the reaction and it could be reused without the significant loss of activity/selectivity performance. No by-product formation, high yields, short reaction times, mild reaction conditions and operational simplicity with reusability of the catalyst were the salient features of the present synthetic protocol. Presence of H2O as a solvent was also recognized as a “green method”.
Page
2618 - 2626
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