Factors effecting the hydrogenation of fructose with a water soluble Ru–TPPTS complex. A comparison between homogeneous and heterogeneous catalysis

✍ Scribed by Annemieke W Heinen; Georgios Papadogianakis; Roger A Sheldon; Joop A Peters; Herman van Bekkum

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 202 KB
• Volume: 142
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/s1381-1169(98)00288-x

✦ Synopsis

Inulin, a polysaccharide containing one D-glucose and 10 to 50 D-fructose units, when hydrolysed and hydrogenated in a one pot approach, would be an attractive D-mannitol feedstock. For this purpose, the hydrogenation was studied with fructose as a model compound, using a water soluble, homogeneous catalyst. This catalyst contains ruthenium as the active Ž Ž .. metal, and trisulfonated triphenylphosphine TPPTS, P m-C H SO Na , as the ligand. The effects of temperature, 6 4 3 3 pressure, catalystrsubstrate and ligandrmetal ratios on the activity and selectivity were investigated. The reaction was Ž . shown to be homogeneously catalysed, despite the formation of some ruthenium particles at higher temperatures ) 908C , 1 3 1 Ž . and the active complex was studied with H and P NMR. Addition of HCl or salts NaCl, Nal and CaCl increased the 2 selectivity to D-glucitol and the catalytic activity. Upon deuterogenation of fructose with H in D O, D was built in only at 2 2 the 2-position.