A síntese de alguns derivados dos 1,2,4-oxadiazóis (4a-d) partindo das arilamidoximas apropriadas (1a-d) e do ácido N-t-butoxycarbonil-O-benzil-L-aspártico é descrita. As estruturas destes novos compostos foram determinadas por meios espectroscópicos.The synthesis of some 1,2,4-oxadiazole derivatives (4a-d) starting from arylamidoximes 1a-d and N-t-butoxycarbonyl-O-benzyl-L-aspartic acid is described. The structures of these new products have been determined by spectroscopic methods.

This study describes properties of biomasses of Moringa oleifera Lamarck for energetic applications of production of biodiesel and briquettes. The seeds collected of the mature pods were the initial biomasses used of this plant. The seeds were separated into husks and oilseed grains, from which the oils were extracted by mechanical pressing and by solvent extraction. The crude oil mixed (of pressing and by solvent) was degummed, neutralized, washed, dried and characterized. The purified oil was converted into methyl biodiesel in homogeneous alkaline transesterification, which was purified and characterized. The residual peels and pies had their calorific powers measured and compared with classic agricultural residues: firewood, sugarcane bagasse and coconut husks. Moringa culture was compared to soybeans in agricultural and biodiesel production perspectives. The analytical results show that the biomasses of the moringa are favorable as renewable biofuels like biodiesel or briquettes due to the good calorific power and simple and accessible productive technology. The production of briquettes starting from the biomasses of the moringa would be recommended with the uses of the pod husks, seed peels and pies (cakes) of extraction of the oil. The agricultural management and the simple productive technologies applied to the moringa are favorable for social inclusion by enabling family agriculture.

In this work it was carried out the chromatographic characterisation of vegetable oils (castor, soybean, cotton and jatropha) and animal fats (beef tallow and chicken fat), considered as potential feedstocks for biodiesel production. The samples were transesterefied in microscale, followed by the characterisation by gas chromatographic with flame ionisation detector, regarding the proximate composition of present fatty acids. The results indicated some convergences in the composition of the fatty materials, regardless of origin, if animal or vegetable. The most relevant convergences were observed in the cotton and soybean oils in terms of linoleic acid (51.2% and 56.1%, respectively). The jatropha oil (Jatropha curcas) and chicken fat exhibited convergence in terms of oleic acid (42.4% and 42.1%, respectively). On the other hand, the stearic acid prevailed in the Original Research Article beef tallow (38.9%), with the ricinoleic acid predominant in the castor oil (87.0%). Of all the feedstocks investigated, the residuals fats (beef tallow and chicken fat) are considered the most favourable for biodiesel production, due to their lower cost associated with their structural nature. The beef tallow consists mostly of stearic acid (38.9%) while the chicken fat of the oleic acid (42.0%) and both present good oxidative stability, partly transferring this feature to the biodiesel derived. Moreover, are not competitors as feed sources as the soybean and cotton oils.

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