Pinheiro, Patricia Fontes published the artcileOne-pot synthesis of alkyl levulinates from biomass derivative carbohydrates in tin(II) exchanged silicotungstates-catalyzed reactions, Quality Control of 539-88-8, the main research area is tin exchanged Keggin heteropolyacid catalysis carbohydrate alcoholysis alkyl levulinate.
Biomass is an attractive source of carbohydrates that can be converted to fuels and fine chems. Acid-catalyzed alcoholysis of biomass derivatives provides alkyl levulinates, which are fuel bioadditives, intermediates in the synthesis of drugs and agrochems. In this work, we developed a one-pot route to obtain alkyl levulinates using Sn(II) exchanged Keggin heteropolyacids (i.e., H3PW12O40, H3PMo12O40, and H4SiW12O40) as catalysts, in alcoholysis reactions of various carbohydrates. All the catalysts were characterized by FT-IR, XRD, EDS/SEM, TG/DSC, and BET anal. The tin(II) silicotungstate was the most active and selective catalyst. After 2 h of reaction carried out at 423 K, an almost complete conversion was achieved on the ethanolysis of the fructose, sucrose and inulin, which gave high yields of Et levulinate (ca. 78, 71 and 61 mol%, resp.). In all reactions, 5-ethoxymethylfurfural was always the secondary product. Maltose, galactose, and glucose were almost unreactive. The effects of main parameters of reaction, such as temperature, catalyst load, and type of alcs. were assessed. The Sn2SiW12O40 catalyst was easily recovered and successfully reused for 7 cycles, without loss activity.
Cellulose (Dordrecht, Netherlands) published new progress about Alcohols Role: RCT (Reactant), RACT (Reactant or Reagent). 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Quality Control of 539-88-8.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics