Heteropoly acid catalysts in the valorization of the essential oils : acetoxylation of b-caryophyllene.

• Autor(a) principal: Rocha, Kelly Alessandra da Silva
• Data de Publicação: 2010
• Outros Autores: Rodrigues, Nathália V. S., 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/123456789/5027; https://doi.org/10.1016/j.apcata.2009.11.032
• topic: Acetoxylation; Acid catalysis; Heteropoly acid

H3PW12O40 (PW), the strongest heteropoly acid in the Keggin series, is an active and environmentally friendly catalyst for the liquid-phase conversion of b-caryophyllene (1) to b-caryolanyl acetate (2) in homogeneous and heterogeneous systems. An efficient and clean method for the synthesis of 2, providing amixture containing two stereoisomeric b-caryolanyl acetates 2a and 2b, 2a/2b = 80/20 mol/ mol, with 100% GC yield, has been developed using PW as a homogeneous catalyst under mild reaction conditions. The reaction occurs at 25 8C with a catalyst turnover number of 2000. The catalyst can be recovered without neutralization and reused without loss of activity and selectivity.