Front Cover Picture: Visible Light‐Driven, Room Temperature Heck‐Type Reaction of Alkyl Halides with Styrene Derivatives Catalyzed by B 12 Complex (Adv. Synth. Catal. 12/2019)

The front cover picture , provided by L. Chen, Y. Hisaeda, and H. Shimakoshi, illustrates a visible light‐driven, room temperature Heck‐type coupling reaction catalyzed by the cobalt complex combined with a photosensitizer. The present study provides a useful guidepost for the synthesis of various substituted alkenes under mild conditions by a green system. The mild reaction conditions using an environmentally benign cobalt catalyst derived from the natural B 12 demonstrate a practical protocol for the synthetic organic chemistry of the B 12 ‐catalyzed reaction system. Details of this work can be found in the full paper on pages 2877–2884 (L. Chen, Y. Hisaeda, H. Shimakoshi, Adv. Synth. Catal . 2019 , 361 , 2877–2884; DOI: 10.1002/adsc.201801707).