Front Cover: Catalytic Intramolecular Wittig Reaction Based on a Phosphine/Phosphine Oxide Catalytic Cycle for the Synthesis of Heterocycles (Eur. J. Org. Chem. 18/2017)

The cover picture shows the catalytic intramolecular Wittig reaction starting from carbonyl‐containing bromides. The byproduct R3PO participates in the catalytic cycle; therefore, the Wittig reaction can be accomplished with only a catalytic amount of the organophosphorus reagent. The reaction has also been applied to the efficient and selective synthesis of isoquinolin‐1(2H)‐ones, indoles, 2,3‐dihydro‐1H‐2‐benzazepin‐1‐ones, benzofurans, and 1,2‐dihydroquinolines by using a catalytic amount of phosphine oxide and a tetramethyldisiloxane/titanium isopropoxide reductant system. Details are discussed in the Full Paper by M.‐W. Ding et al. on page 2568 ff (DOI: 10.1002/ejoc.201601628).