The title triterpene, C30H50O2, is an 18α-oleanane derivative prepared by the Wagner–Meerwein rearrangement of betulin with Bi(OTf)3.xH2O (OTF is trifluoromethanesulfonate).There are two symmetry-independent molecules in the asymmetric unit that show no significant differences concerning bond lengths and Glass Container angles.Th
Abstract When particles are deposited at a fluid interface they tend to aggregate by capillary attraction to minimize the overall potential energy of the system.In this work, we embed floating millimetric disks with permanent magnets to introduce a competing repulsion effect and study their pattern formation in equilibrium.The pairwise energy lands
In some areas, it is surprisingly possible to see a dense cover of rangeland species that has sustained soils and controlled the sedimentation rate of marl lands.It seems that some of the physical and chemical properties of marl are the main reasons for such a cover in the areas covered by Marlene formations.This research was carried out with the a