Cover Picture

This cover picture shows a novel type of 10C-carbolong complexes constructed by a formal [7C+3C] method, from the reactions of a metallapentalyne with benzyl carbanions. The newly formed metallacyclopentadiene ring in the 10C-carbolong complexes was generated through a nucleophilic attack of carbanions to the M≡C bond followed by C–H activation. This work provides a new convenient route to construct metallacyclopentadienes and 10C-carbolong complexes. More details are discussed in the article by Xia et al. on page 235—242.