Frontispiz: Triangles and Squares for a Unique Molecular Crystal Structure: Unsupported Two‐Coordinate Lithium Cations and CC Agostic Interactions in Cyclopropyllithium Derivatives. (6th February 2018) - Dufrois, Quentin; Daran, Jean‐Claude; Vendier, Laure; Dinoi, Chiara; Etienne, Michel