Front Cover Picture: A Sulfone‐Containing Imidazolium‐Based Brønsted Acid Ionic Liquid Catalyst Enables Replacing Dipolar Aprotic Solvents with Butyl Acetate (Adv. Synth. Catal. 14/2019)

The front cover picture, provided by Minghao Li, Yanlong Gu and co‐workers, illustrates an environmentally benign medium that has emerged as a new facet of green chemistry. Dipolar and aprotic solvents were often used in acid‐catalyzed reactions. However, they are toxic and sometimes explosive. The sulfone‐containing imidazolium‐based Brønsted acid ionic liquid developed by Minghao Li and Yanlong Gu enables the use of an industrially acceptable and environmentally benign solvent, butyl acetate, as the reaction medium. The ionic liquid/butyl acetate biphasic system was successfully utilized in many organic reactions, which generally relied heavily on dipolar and aprotic solvents. Details of this work can be found in the full paper on pages 3342–3350 (A. El‐Harairy, Yiliqi, B. Lai, L. Vaccaro, M. Li, Y. Gu, Adv. Synth. Catal. 2019, 361, 3342–3350; DOI: 10.1002/adsc.201900246).