Back Cover: Lactonization of C(sp2)—H Bonds in Enamides with CO2 (Chin. J. Chem. 5/2018)

The back cover picture shows a novel synthesis of 1,3‐oxazin‐6‐ones from enamides with CO₂ through C—H carboxylation and one‐pot cyclization. The concept of “CO₂ = CO + O”, using CO₂ to replace toxic CO and stoichiometric oxidant, guilds the development of this chemistry as well as green and safe synthetic methods in the future. More details are discussed in the article by Yu et al. on page 430–436.