Add time:09/06/2019 Source:sciencedirect.com
The selective and efficient solvent-free hydrogenation of bio-based levulinic acid (LA) to γ-valerolactone (GVL) was achieved with new pyridylimine ruthenium(II) complexes as catalyst precursors. The hydrogenation reactions were performed in the presence of formic acid as hydrogen source using a catalyst loading as low as 0.1 mol% with potassium hydroxide or triethylamine (Et3N). 4-Hydroxyvaleric acid (HVA) was produced only when KOH was used, whereas reactions involving Et3N were selective to GVL. At 150 °C, >96% LA conversions were achieved with 100% GVL selectivity. Recyclability of catalyst precursors was demonstrated by running three consecutive reactions where 100% conversion and selectivity was maintained. In-situ NMR studies show that hydrogen gas is formed by the decomposition of formic acid to carbon dioxide and hydrogen. Ru-hydride species have been detected, by 1H NMR, and are believed to be the catalytically active species, and a mechanism of the reaction has been proposed.
We also recommend Trading Suppliers and Manufacturers of 5-OXO-5-(2-PYRIDYL)VALERIC ACID (cas 13672-84-9). Pls Click Website Link as below: cas 13672-84-9 suppliers
About|Contact|Cas|Product Name|Molecular|Country|Encyclopedia
Message|New Cas|MSDS|Service|Advertisement|CAS DataBase|Article Data|Manufacturers | Chemical Catalog
©2008 LookChem.com,License: ICP
NO.:Zhejiang16009103
complaints:service@lookchem.com Desktop View