In this issue, C. J. Sumby et al. review mixed-matrix membranes. How can they contribute to more efficient separation techniques? In a Minireview, G. P. McGlacken et al. discuss the direct asymmetric alkylation of ketones. The Highlight deals with aerobic oxidation and the chemoselective synthesis of benzaldehydes (J. P. Lumb).

In the Communications section, S. Wei et al. present a single-site active cobalt photocatalyst for spontaneous water splitting (see picture). A. J. Borysik describes how simulated isotope exchange patterns enable protein structure determination. R. Müller et al. succeeded in the structure elucidation and biosynthesis of cytotoxic myxobacterial metabolites of pyxipyrrolones.

• Angewandte Chemie 32/2017: An Active Catalyst,
  Angew. Chem. Int. Ed. 2017, 56 (32).