Resumo

ROJAS, Hugo A et al. ASYMMETRIC HYDROGENATION OF 4-METHOXYACETOPHENONE OVER Pt/TiO2 CATALYSTS MODIFIED WITH CHINCHONIDINE. Rev.Colomb.Quim. [online]. 2009, vol.38, n.1, pp.97-105. ISSN 0120-2804.

The enantioselective hydrogenation of 4-methoxyacetophenone over Pt/TiO2 catalyst reduced to 773 K in the presence of cinchonidine (CD) was studied. The catalysts were characterized by N2 physisorption, H2 chemisorption, XRD and XPS. The reactions were carried out in a STR reactor at various concentrations of CD. The effect of several reaction parameters was investigated, such as the addition order of the modifier and hydrogen pressure. Lower concentrations of CD can produce an enantiomeric excess near to 30%. The structure of the molecule can influence the behavior observed.

Palavras-chave : 4-methoxyacetoprienone; cinchonidine; Pt/TiO2 catalysts.

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