Inside Cover Picture

The picture in the background is the old chemistry building of Soochow University, the symbols of S are: 1. for the research field of Prof. Wang Shunyi's group at Soochow University: Organic Sulfur Chemistry; 2. for Soochow University; 3. for Suzhou; 4. for Singapore. We would like to take this opportunity to celebrate the 110th anniversary of the founding of Chemistry and Chemical Engineering in Soochow University, as well as the 30th anniversary of the Suzhou-Singapore Industrial Park. The cover image portrays the reductive coupling reaction of xanthate esters with sulfur-containing and selenium-containing compounds (thio(seleno)sulfonates and disulfides(selenides)) under the nickel-catalyzed condition. It provides a mild and effective method for the synthesis of unsymmetric sulfides and selenides. More details are discussed in the article by Wang et al. on pages 2453—2458.