The complete removal of ruthenium residues from olefin metathesis reaction products is rather challenging and often poses serious problems. In the Minireview on page 8868 ff., G. C. Vougioukalakis discusses all available strategies for the removal of ruthenium impurities from olefin metathesis post-reaction mixtures. In view of the fact that there are many different approaches dealing with this problem, this work will serve as a valuable guide for the synthetic chemist utilizing ruthenium-catalyzed metathesis reactions in the synthesis of either organic or polymeric materials.
In their Communication on page 8925 ff., G. Rapenne et al. report on a new family of nanowheels and have shown how they can contribute to the development of nanomachines, such as nanovehicles, which require wheels to move efficiently on a surface, pushed by the STM tip, with the aim of transporting small molecules (nanocarrier machines) long distances.
In their Full Paper on page 8934 ff., C. F. R. A. C. Lima, L. M. N. B. F. Santos et al. describe the experimental evaluation of the intramolecular interaction enthalpy between the two aryl rings in various substituted 1,8-diphenylnaphthalenes. The major contribution ruling aromatic interactions in these systems is dispersion forces, rather than electrostatic forces.