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No povoado do Crasto de Palheiros, na zona formalmente denominada de Unidade Interna, exumaram-se cerâmicas campaniformes. Neste artigo pretende-se efectuar a caracterização arqueográfica do material cerâmico exumado nessa zona, bem como procurar entender as possÃveis articulações - funcionais ou outras - das cerâmicas campaniformes quer com o restante espólio arqueológico, quer com a área especÃfi...
La miel es un producto natural reconocido, prácticamente, a nivel mundial por su valor nutritivo, energético y farmacológico [1]. Su composición química, y por defecto, sus caracterís-ticas organolépticas, dependen del tipo de miel, origen botánico y geográfico, néctar, tecnologías de producción y condiciones de almacenamiento [2]. Una inadecuada forma de almacenamiento y conservación pueden ocasionar deterio...
O objectivo do presente artigo consiste na apresentação e avaliação de uma intervenção em redução de riscos e minimização de danos, implementada em Torres Vedras, desde Dezembro de 2005. Este programa, que teve início antes da reorganização formal do IDT, assume hoje uma nova dimensão, com a consolidação da redução de riscos enquanto área de missão.
The lipophilic composition of honeybee pollen from Cistus ladanifer, Castanea sativa and Rubus sp. was analysed by GC-MS. The extracts are mainly composed by saturated and unsaturated fatty acids, sterols, long chain aliphatic alcohols, alkanes and alkenes. The profiles of chemical composition allow the chemical differentiation of pollen species. The biological activity of the lipophilic fractions against sever...
The palladium-catalyzed amination of arylhalides has become an important method for the synthesis of arylamines found in pharmaceuticals. Using this methodology we were able to synthesize several diarylamines in the benzo[b]thiophene series.Here we report the synthesis 01 differently substituted diarylamines derivatives 01 6-bromo or 6-amino- 2,3,5-trimethylbenzo[b]thiophene in good to high yields (50-90%) (Sch...
Several diarylamines la-f and 2 were prepared using palladium-catalyzed C-N coupling of electron deficient or rich benzo[b]thienylbromides with aromatic amines. Using 2-aminopyridine a one pot C-N coupling and intermolecular cyclization involving the nitrogen of the pyridine, with lost of ethanol, occurred giving compound 3.
O pólen é o elemento germinal masculino das plantas fanerogâmicas. Encontra-se na forma pulverulenta nas anteras florais situadas na parte terminal dos estames das flores.
Several diarylamines in the benzo[b]thiophene series were prepared in good to high yields by palladium-catalysed amination of ethyl 3-bromobenzo[b]thiophene-2-carboxylate with anilines and 5-aminoindole in the presence of Pd(OAc)2, BINAP and Cs2CO3 in toluene. The presence of the ester group at the 2-position of the benzo[b]thiophene moiety increases the yields and lowers the heating times relative to the react...
Several diarylamines in the benzo[b]thiophene series were prepared by palladium catalyzed amination of ethyl 3-bromobenzo[b]thien-2-yl carboxylate with anilines and 5-aminoindole, in good to high yields using Pd(OAc)2, BINAP, Cs2CO3 in toluene. The presence of the ester group in the position 2 of the benzo[b]thiophene moiety increases the yields and lowers the heating times when compared with reactions using 3-...