In the modern science, priority is given for the search of biological active compounds with specific properties. As a result of experimental data, it was found
<div style="text-align:justify;"> Series of 1,3-dibenzyl-1<i>H</i>-4,5,6,7-tetrahydro-1,3-diazepinium and 1,4,5,6,7,8-hexahydro-1,3-diazocinium salts derivative
The heavy mineral sands of Senegal are exploited to extract titanium oxides and zircon. Mining is carried out first by means of a floating dredge and concentrat