Oxidação do glicerol e monoterpenos catalisada por compostos de paládio e cobalto

• Autor(a) principal: Silva, Milene Lopes da
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2156
• topic: Glicerol; Monoterpenos; Catálise homogênea; Paládio; Cobalto; Glycerol; Monoterpenes; Homogeneous Catalysis; Palladium; Cobalt; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA INORGANICA

The main objective herein was evaluate the catalytic performance of palladium compounds in the oxidation of glycerol and cobalt chloride oxidation of monoterpenes (b-pinene, a-pinene and camphene) in homogeneous phase employing hydrogen peroxide as the oxidant. The effects of main parameters of reaction in the conversion and selectivity of oxidation (monoterpenes and glycerol) have been studied, such as the nature of the solvent, the effect of concentration both oxidant and catalyst. Among the catalysts evaluated in the oxidation of glycerol, the Pd (CH3COO)2 was the most active and selective, leading to the formation of acetic acid and subsequent formation of an acetylation product of glycerol (2-glycerol monoacetate). Compared to the literature, the results obtained are encouraging and suggest the heterogeneity of the system. In monoterpenes oxidation catalyzed by CoCl2, the structure of the substrate and the solvent used, have determined the selectivity and conversion obtained. The b-pinene was more efficiently oxidized substrate, and was converted into important products like pinocarveol, pinocarvona, myrtenal, myrtenol, methoxy-mirteno and a-terpineol. The reaction time was key in the formation of a-terpineol. Unlike the b-pinene, reactions performed for a-pinene and camphene had low rates of conversion and selectivity. It is noteworthy that the available literature does not report the use of any of these systems employing H2O2 for the oxidation of glycerol and monoterpenes.