Frontispiece: Recent Advances in the Cycloisomerizations of Methylenecyclopropanes using Gold Catalysis

With the significant development of homogeneous gold catalysis, the cycloisomerizations of methylenecyclopropanes upon gold catalysis have drawn much attention from organic chemists in the past decades. Two different patterns of gold(I)‐catalyzed cycloisomerizations of methylenecyclopropanes include ring‐expansion and ring‐opening reactions. The ring‐expansion reaction proceeds through carbene or non‐carbene pathway, affording functionalized cyclobutene or cyclobutane polycyclic scaffolds; the ring‐opening reaction can undergo distal and proximal carbon−carbon bond cleavage, providing a simple strategy for the rapid generation of molecular complexity. In their Concept article on page 9998 ff., W. Fang and M. Shi focuses on gold(I)‐catalyzed cycloisomerizations of methylenecyclopropanes for the production of various polycyclic structures over the past four years.