Esterification of camphene over heterogeneous heteropoly acid catalysts : synthesis of isobornyl carboxylates.

• Autor(a) principal: Meireles, Augusto Luís Pereira de
• Data de Publicação: 2011
• Outros Autores: Rocha, Kelly Alessandra da Silva, Kozhevnikov, Ivan V., Gusevskaya, Elena Vitalievna
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFOP
• Texto Completo: http://www.repositorio.ufop.br/handle/123456789/5091; https://doi.org/10.1016/j.apcata.2011.09.032
• topic: Biomass-based feedstock; Esterification; Camphene; Heterogeneous acid catalysis; Heteropoly acid

Silica supported H3PW12O40 (PW), the strongest heteropoly acid in the Keggin series, is an active and environmentally friendly solid acid catalyst for liquid-phase esterification of camphene, a renewable biomass-based substrate, with C2, C4 and C6 short-chain fatty acids. The reaction provides isobornyl carboxylates, useful as fragrances, in virtually 100% selectivity and 80–90% yield. The reaction is equilibrium-controlled and occurs under mild conditions with a catalyst turnover number of up to 3000. The use of hydrocarbon solvent prevents PW from leaching to allow easy catalyst recovery. The catalyst can be reused several times without loss of activity and selectivity.