Continuous niobium phosphate catalysed Skraup reaction for quinoline synthesis from solketalTools Jin, Jing, Guidi, Sandro, Amara, Zacharias, Selva, Maurizio, George, Michael W. and Poliakoff, Martyn (2017) Continuous niobium phosphate catalysed Skraup reaction for quinoline synthesis from solketal. Green Chemistry, 19 . pp. 2439-2447. ISSN 1463-9262 Full text not available from this repository.AbstractSolketal is derived from the reaction of acetone with glycerol, a by-product product of the biodiesel industry. We report here the continuous reaction of solketal with anilines over a solid acid niobium phosphate (NbP), for the continuous generation of quinolines in the the well-established Skraup reaction. This study shows that NbP can catalyse all stages of this multistep reaction at 250 °C and 10 MPa pressure, with a selectivity for quinoline of up to 60%. We found that the catalyst eventually deactivates, most probably via a combination of coking and reduction processes but nevertheless we show the promise of this approach. We demonstrated here the application of our approach to synthesize both mono- and bis-quinolines from the commodity chemical, 4,4’-methylenedianiline.
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