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Melamine-derived graphitic carbon nitride as a new effective metal-free catalyst for Knoevenagel condensation of benzaldehyde with ethylcyanoacetate

Abstract

Graphitic carbon nitride was prepared by bulk and hard template pyrolysis of melamine. The prepared g C3N4 as well as N-doped carbon used for comparison exhibited a reasonable catalytic activity in the Knoevenagel condensation between benzaldehyde and ethylcyanoacetate yielding ethyl-α-cyanocinnamate (conversion of benzaldehyde up to 100%, yield of the desired product up to 51%). In the studied reaction conditions weak basic sites assigned as C-N=C species are responsible for selective formation of the desired product. An increase of tertiary nitrogen content leads to an increase of benzaldehyde conversion with a simultaneous decrease of selectivity towards ethyl-α-cyanocinnamate due to a higher basicity. Carbon nitride obtained using silica as a hard template allows to achieve the highest yield of the desired product (50.9%)

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Publication details

The article was received on 03 Feb 2018, accepted on 08 May 2018 and first published on 09 May 2018


Article type: Paper
DOI: 10.1039/C8CY00253C
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Melamine-derived graphitic carbon nitride as a new effective metal-free catalyst for Knoevenagel condensation of benzaldehyde with ethylcyanoacetate

    N. Shcherban, P. Mäki-Arvela, A. Aho, S. Sergiienko, P. Yaremov, K. Eränen and D. Murzin, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY00253C

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