Front Cover: Three‐Component Activation/Alkynylation/Cyclocondensation (AACC) Synthesis of Enhanced Emission Solvatochromic 3‐Ethynylquinoxalines (Chem. Eur. J. 32/2018)

Fluorescent polarity sensors are rapidly and efficiently assembled from (hetero)aryl α‐ketoacids, terminal alkynes, and 1,2‐diamino arenes in a consecutive three‐component one‐pot synthesis. Correlation of the photophysical data indicate that the emission color of a single chromophore experiences a broad shift from blue–green to deep red–orange by only slightly altering the solvent polarity. More information can be found in the Full Paper by T. J. J. Müller, et al. on page 8114.