Four renewable lactones, γ-butyrolactone, γ-valerolactone, δ-valerolactone, and ε-caprolactone (GBL, GVL, DVL, ECL, respectively) were shown to react with dimethyl-, diethyl-, and dibenzyl-carbonate (DMC, DEC, DBnC, respectively) in the presence of K2CO3 as basic catalyst, to yield selectively either the α-alkyl derivatives 1c–6c in the case of the five-membered ring GBL and GVL or the highly oxygenated acyclic monomeric derivatives 7a, 8a, and 9a in the case of the six- and seven-membered rings DVL and ECL. Selectivity and reaction conditions are investigated and a reaction mechanism is proposed. The organic carbonates act both as reagent and as reaction solvents, and the catalyst can be recovered by filtration and recycled.

Four renewable lactones, γ-butyrolactone, γ-valerolactone, δ-valerolactone, and ε-caprolactone (GBL, GVL, DVL, ECL, respectively) were shown to react with dimethyl-, diethyl-, and dibenzyl-carbonate (DMC, DEC, DBnC, respectively) in the presence of K 2CO3 as basic catalyst, to yield selectively either the α-alkyl derivatives 1c-6c in the case of the five-membered ring GBL and GVL or the highly oxygenated acyclic monomeric derivatives 7a, 8a, and 9a in the case of the six-and seven-membered rings DVL and ECL. Selectivity and reaction conditions are investigated and a reaction mechanism is proposed. The organic carbonates act both as reagent and as reaction solvents, and the catalyst can be recovered by filtration and recycled. © 2014 American Chemical Society.

Upgrading of Biobased Lactones with Dialkylcarbonates

CARETTO, ALESSIO;NOE', Marco;SELVA, Maurizio;PEROSA, Alvise
2014-01-01

Abstract

Four renewable lactones, γ-butyrolactone, γ-valerolactone, δ-valerolactone, and ε-caprolactone (GBL, GVL, DVL, ECL, respectively) were shown to react with dimethyl-, diethyl-, and dibenzyl-carbonate (DMC, DEC, DBnC, respectively) in the presence of K 2CO3 as basic catalyst, to yield selectively either the α-alkyl derivatives 1c-6c in the case of the five-membered ring GBL and GVL or the highly oxygenated acyclic monomeric derivatives 7a, 8a, and 9a in the case of the six-and seven-membered rings DVL and ECL. Selectivity and reaction conditions are investigated and a reaction mechanism is proposed. The organic carbonates act both as reagent and as reaction solvents, and the catalyst can be recovered by filtration and recycled. © 2014 American Chemical Society.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10278/40982
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