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The Front Cover shows a variety of dienophiles used in the synthesis of functionalized polycyclic aromatic hydrocarbons over the past decade via the Diels‐Alder reaction. Being discovered almost a century ago, this powerful synthetic method can be used for construction of new materials for organic electronics – one of the modern challenges of organic chemistry. Linear or angular, planar or curved, molecular or polymeric – the product scope is vast and will broaden even more with further development of new diene and dienophile components. More information can be found in the Minireview by P. A. Zaikin et al.

An effective protocol for the solvent‐free fluorination of electron‐rich aromatic compounds with 1‐chloromethyl‐4‐fluoro‐1,4‐diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate) (F‐TEDA‐BF4) is described. The protocol allows the easy and efficient isolation of fluorinated products in high yields and purities with low E factors (kgwaste kgproduct–1) by vacuum‐sublimation without the use of any solvent. The solid‐state fluorination of naphthalen‐2‐ol was studied by differential thermal analysis, and scanning electron microscopy was used to obtain evidence for the solid‐state process. The crucial influence of alkali‐metal carbonates on the rate of the solvent‐free fluorination of hydroxynaphthalenes and estrone was demonstrated.

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