The direct alkynylation of electron-rich aromatic heterocycles with terminal alkynes was accomplished in high yields and good selectivity when using a low loading of palladium catalyst, as described by W. Su and co-workers in their Communication on page 3630 ff. A high loading of palladium catalyst led to poor yields because of the undesired homocoupling of alkynes.
Dispersants for Nanotubes
Polymer-based Janus micelles provide excellent stabilization for carbon nanotubes in a variety of solvents. The “Janus balance” is critical for good stabilization properties as A. H. Gröschel, A. H. E. Müller et al. explain in their Communication on page 3602 ff.
An ultratough artificial nacre based on graphene oxide sheets is presented by Q. F. Cheng, M. Z. Li, Z. Y. Tang et al. in their Communication on page 3750 ff. This conductive nacre shows excellent mechanical properties and a hierarchical microstructure.
In their Communication on page 3695 ff., R. Lyndon, M. R. Hill, et al. report a metal–organic framework constructed with light-responsive linkers, which are activated upon exposure to light and release the stored carbon dioxide.