Encontrados 4 documentos, a visualizar página 1 de 1
Síntese de fotoprotetores e sua imobilização em poli(metacrilato de metilo): um...
Murtinho,Dina Maria B.; Serra,Maria Elisa S.; Pineiro,MartaDibenzalacetone and other aldol condensation products are known sunscreens commonly used in cosmetics. This type of compounds can easily be prepared in an Organic Chemistry Lab by reaction of aldehydes with ketones in basic medium. These compounds can be incorporated in poly(methyl methacrylate) and used as UV light absorbers, for example in sunglasses. This project has the advantage of using inexpensive reagen...
A comparative study of reactivity and selectivity of chiral diamines and struct...
Serra, M. Elisa Silva; Murtinho, Dina; Gonsalves, A. M. d'A. RochaA series of chiral delta-diamines and structurally analogous delta-amino alcohols derived from natural tartaric acid were synthesized and a comparative study of their activity and selectivity in the enantioselective alkylation of aromatic aldehydes was carried out. Our results show that in general the delta-diamines were found to be better chiral inducers than the corresponding delta-amino alcohols. The highest...
Desenvolvimento de novos catalisadores quirais para alquilação e redução
Murtinho, Dina Maria BairradaO plano de trabalho que deu lugar a esta dissertação visava o desenvolvimento de novos catalisadores quirais adequados a processos catalíticos enantiosselectivos de alquilação e redução de aldeídos e cetonas. São processos que permitem obter álcoois secundários quirais (com ou sem aumento da cadeia carbonada), compostos com largo espectro de aplicação, nomeadamente como materiais de partida para a síntese de co...
Pyrrolidine-based amino alcohols: novel ligands for the enantioselective alkyla...
Gonsalves, António M. d'. A. Rocha; Serra, M. Elisa S.; Murtinho, Dina; Silva, Vitor F.; Beja, A. Matos; Paixão, J. A.; Silva, M. RamosA series of easily obtained pyrrolidine-based [beta]-amino alcohols derived from tartaric acid and primary amines was synthesized and used as chiral ligands in the enantioselective alkylation of benzaldehyde. Using diethylzinc, 1-phenyl-1-propanol was obtained with enantiomeric excesses of up to 80% when (3S,4S)-N-(1-naphthylmethyl)-3,4-dihydroxypyrrolidine was used. The nature of the N-substituent on the ligan...
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