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Valorization of agricultural waste and CO2 into bioderived cyclic carbonates

2021; Elsevier BV; Volume: 9; Issue: 4 Linguagem: Inglês

10.1016/j.jece.2021.105464

2213-3437

Javier Martı́nez, Felipe de la Cruz‐Martínez, Marc Martínez de Sarasa Buchaca, María P. Caballero, Rosa M. Ojeda‐Amador, María Desamparados Salvador, Giuseppe Fregapane, Juan Tejeda, José A. Castro‐Osma, Agustín Lara‐Sánchez,

biodegradable polymer synthesis and properties

Highly efficient and metal-free bifunctional organocatalysts have been used for the synthesis of waste vegetable oils-derived cyclic carbonates from bio-derived epoxides and CO2. In this contribution, epoxides 2a-k and carbon dioxide have been used as renewable feedstocks for the synthesis of cyclic carbonates 5a-k in excellent isolated yields (85–97%) using the highly efficient and metal-free bifunctional imidazole-based organocatalyst 4b under solvent-free conditions. The preparation of cyclic carbonates 5a-g, in which oleic acid is the major component, has been performed at 100 °C and 20 bar CO2 pressure for 16 h using 1 mol% of catalyst 4b. In addition, cyclic carbonates 5h-k have been synthesized at 80 ºC and 20 bar CO2 pressure for 16 h using different catalyst loading of 4b (2 mol% for 5h-j and 3 mol% for 5k). Finally, a reusability study of organocatalyst 4b was performed under the optimized reaction conditions keeping constant the catalytic activity and stability of 4b for at least 5 days.