SEARCH Articles Figures Tables 1-Alkenes From three-membered heterocycles Acetaldehyde, 2-aryl-2,2-dimethoxyaldol reaction five-membered rings from Carbenes Derived from Five-membered Heterocycles Carbenes Derived from Four-membered Heterocycles Five-membered from hexafluoroacetonc Five-membered heterocycles from thioureas Five-membered heterocycles radicals derived from Four-membered heterocyclic compounds from From benzo five-membered heterocycles From five-membered heterocycles by extrusion From five-membered rings From three-membered rings N-Heterocyclic Carbenes Derived from Six- or Seven-membered Heterocycles Ring Expansion from Four-membered Rings Ring compounds heterocyclic five-membered rings from Ring construction nine-membered rings from Rings, seven-membered, from acyclic Rings, seven-membered, from acyclic precursors Seven-Membered Rings from Fragmentation Strategies Structures of Complex Compounds from Five- and Six-Membered Hetarenes Subject index from 4-membered ring precursors Synthetic 10-membered: synthesis from fused ring Three-Membered Rings from ab initio Molecular Orbital