SEARCH Articles Figures Tables 3- Membered rings three heteroatoms 4- Membered rings with three heteroatoms 5-Membered rings heteroatoms APPLICATIONS OF THREE-MEMBERED RINGS WITH TWO HETEROATOMS Aromatic ring heteroatom BICYCLIC ANALOGUES WITH MORE THAN TWO RING-HETEROATOMS Benzene ring heteroatoms introduced into Bicyclic 5-5 and 5-6 Ring Systems with Three Heteroatoms CHARACTERISTICS OF HETEROATOMS IN RINGS Carbon-Heteroatom Bond Formation by Rh-Catalyzed Ring-Opening Reactions Compounds with Heteroatom Five-membered Ring Ligands Directing effects of the ring heteroatom ELECTROPHILIC ATTACK ON RING HETEROATOMS Effects of a Polar Substituent and Heteroatoms in the Ring Eight-membered Rings containing One Heteroatom Eight-membered Rings containing Three or More Heteroatoms Eight-membered Rings containing Two Heteroatoms Five-Membered Ring Systems with Two or More Heteroatoms Five-Membered Rings One Heteroatom Five-Membered Rings with More Than Two Heteroatoms Five-Membered Rings with Two Heteroatoms Five-membered ring systems heteroatoms Five-membered rings heteroatoms Heteroaromatic radicals, Part 1, general ring heteroatoms Heteroaromatic radicals, Part I, general ring heteroatoms Heteroatom Ring Systems Heteroatoms in Each Ring Heteroatoms, three-membered ring opening with Heterocyclic compounds four heteroatomic rings Heterocyclic compounds three heteroatomic rings In computing heteroatom-rich five- and sixmembered ring systems More Than One Heteroatom in the Five-Membered Ring NUCLEOPHILIC ATTACK ON RING HETEROATOMS Nuclear magnetic resonance 5- membered rings, one heteroatom Of heterocycles: five-membered rings with one heteroatom Of heterocycles: five-membered rings with two or more heteroatoms One Heteroatom Adjacent to the Ring Junction One Heteroatom at a Ring Junction One Heteroatom in Each Ring Orientation in azole rings containing three or four heteroatoms Other Heteroatoms in the Ring REACTIVITY OF THREE-MEMBERED RINGS WITH TWO HETEROATOMS Reactions with Five-Membered Ring Systems Containing One Heteroatom Reactivity of Five-membered Rings with One Heteroatom Reactivity of Five-membered Rings with Two or More Heteroatoms Reactivity of Substituents Attached to Ring Heteroatoms Ring expansion heteroatoms Ring formation four-heteroatomic rings Ring formation three-heteroatomic rings Ring structure heteroatoms Ring with heteroatom nucleophiles Ring-Opening Unsymmetrical Oxa- and Aza-bicyclic Alkenes with Heteroatom Nucleophiles Ring-Opening of Vinyl Epoxides with Heteroatom Nucleophiles Ring-heteroatom backbone structure Rings Containing Three Heteroatoms The Triazines Rings With More Than One Heteroatom Rings containing More than One Heteroatom Rings containing One Heteroatom Rings containing Two Heteroatoms Rings that Contain One Heteroatom Rings that Contain Three or More Heteroatoms STRUCTURE OF THREE-MEMBERED RINGS WITH TWO HETEROATOMS SYNTHESIS OF THREE-MEMBERED RINGS WITH TWO HETEROATOMS Saturated Six-Membered Rings with Two Heteroatoms Saturated bicyclic 6/5 ring-fused systems additional heteroatom Saturated bicyclic 6/5 ring-fused systems with additional heteroatom Saturated bicyclic 6/5 ring-fused systems with heteroatom Seven-membered Rings containing Three or More Heteroatoms Seven-membered rings three heteroatoms Six-Membered Rings with Three Heteroatoms Six-Membered Rings with Two Heteroatoms Steroids with a Heteroatom in Ring Structure of Five-membered Rings with One Heteroatom Structure of Five-membered Rings with Two or More Heteroatoms Sulfur compounds heteroatoms, five-membered rings Synthesis of Five-Membered Rings with Two Heteroatoms Synthesis of Monocyclic Rings with One Heteroatom Synthesis of Monocyclic Rings with Two or More Heteroatoms Synthesis of Rings with One Other Heteroatom Synthesis of Rings with Three or More Heteroatoms Synthesis of Rings with Two Heteroatoms Systems with One Heteroatom at a Ring Junction Three-Membered Rings with One Heteroatom Three-membered rings with two heteroatoms Typical Ring Synthesis of a Pyridine Involving Only C-Heteroatom Bond Formation Typical Ring Synthesis of a Pyrrole Involving Only C-Heteroatom Bond Formation Unsymmetrical ring-opening, with heteroatom