J. Braz. Chem. Soc. vol.13 número2

Keywords: sol-gel process, copper containing silicates, cyclohexane oxidation, tert -butyl hydroperoxide,

All five HA presented a much higher aromatic and lower carboxylic contents than those obtained for an Australian brown coal HA 8 and those usually reported for soil HA, 1,21. but

The results obtained through X-ray structural analysis, magnetic properties and elemental analysis and the critical temperature of the compounds indicate the interlocked structure to

Diethyl ether (10ml) and water (25ml) were added, and the viscous organic layer separated. The white residue was insoluble in most organic solvents

The surface morphology of the samples, before and after use under extensive oxygen evolution (Tafel experiment), was characterized by Scanning Electron Microscopy and the

Despite all the investigations of steroids in the marine environment, the current analytical methodologies for steroids in marine sediments are laborious and time- consuming,

In order to obtain these aggregation pheromones, which present the 6,8-dioxabicyclo[3.2.1]octane structure, the synthetic strategies utilized in this work had as key steps the

The first peak of the g OuHu (r) plots, shown in Figure 4b, indicates that hydrogen bonds between urea molecules are centered at about 0.20 nm and the first peak of the g CuCu (r)