title: One-pot, one-step synthesis of 2,5-diformylfuran from carbohydrates over Mo-containing Keggin heteropolyacids.
abstract: In this work, a one-pot strategy for directly converting fructose into 2,5-diformylfuran (DFF) over Mo-containing Keggin heteropolyacids (HPAs) in open air is developed. H3 PMo12 O40 HPA is found to show high activity and selectivity to the formation of DFF owing to its higher Brønsted acidity and moderate redox potential. The partial substitution of the H(+) in H3 PMo12 O40 with Cs(+) leads to the heterogenization of the HPA by forming its cesium salts Csx H3-x PMo12 (x=0.5, 1.5, and 2.5). A satisfactory yield of 69.3% to DFF is obtained over Cs0.5 H2.5 PMo12 polyoxometalate after deliberate optimization of the reaction conditions. The heterogenized polyoxometalate could be recycled and reused without significant loss of catalytic activity for five runs. The produced DFF could be separated from the resulting mixture by an adsorption-desorption method using activated carbon as the adsorbent and furfural as the desorbent. A highest isolated yield of 58.2% is obtained.
authors.affiliation: Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan university, Chengdu, Sichuan 610064 (P.R. China), Fax: (+86) 28-85411105.
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.forename: Liangfang
authors.initials: L
authors.lastname: Zhu
authors.forename: Jinqiang
authors.initials: J
authors.lastname: Tang
authors.forename: Mingyang
authors.initials: M
authors.lastname: Liu
authors.forename: Ruodi
authors.initials: R
authors.lastname: Cheng
authors.forename: Changwei
authors.initials: C
authors.lastname: Hu
mesh_terms: D000143:Acids / Q000737:chemistry*; D002241:Carbohydrates / Q000737:chemistry*; D005663:Furans / Q000138:chemical synthesis*; D008982:Molybdenum / Q000737:chemistry*
chemical_list: D000143:Acids; D002241:Carbohydrates; D005663:Furans; D008982:Molybdenum; C476922:2,5-diformylfuran
keywords: 2,5-diformylfuran; carbohydrates; molybdenum; one-pot reaction; polyoxometalates