1 resultado para Craft festivals
em Universita di Parma
Filtro por publicador
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Resumo:
This PhD work deals with problems of synthetic organic chemistry with particular attention to the development of environmentally friendly processes. In particular, new synthetic strategies have been studied based on the use of low cost heterogeneous catalysts, non-toxic reagents and mild operating conditions that do not involve, when possible, the use of solvents. The catalysts examined are both basic and acids, commercial or prepared by hetereogenization of homogeneous catalysts synthesized by tethering or impregnation. In particular it will be discussed the catalytic activity of oxides (Al2O3 and TiO2), supported sulphonic acids and hydrotalcites for the reactions of selective monoesterificazion of dicarboxylic acids, dehydrogenation of butane in gas phase, esterification of levulinic acid, Friedel-Craft acylations, C-C and C-P coupling. The use of these materials has allowed the development of simple processes with low environmental impact. The operating conditions are in fact mild and reaction times short. The selectivity for the desired products is in all reported cases very high and the catalysts can be recycled maintaining their optimum performances.