ChemInform Abstract: Aromaticity as a Quantitative Concept. Part 4. Less Familiar Five- and Six-Membered Monocyclic Heterocyclesgeneral, theoretical studiesChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access ...
A series of psychotropic heterobicycloalkylpiperazine derivatives having the structure wherein V is a 3- or 4-membered unsaturated chain, containing all carbon atoms when 4-membered, or when a 3-membered chain, V contains an oxygen or s... NJ Stewart,CW Lynn - US 被引量: 145发表: 1989...
a 6-membered ring optionally substituted with at least one methyl group and/or optionally interrupted by an oxygen or sulfur atom; R8 is a tert-butyl, adamantyl, aryl or aralkyl radical; R9 and R10 together form, with the carbon atoms from which they depend, a 5- or 6-membered ring op...
The first group illustrates the oxygen-containing condensed heterocycles (Figure 2). Figure 2. Oxygen-containing N-heterocycle isomers. Huang et al. presented a one-pot synthesis of substituted furopyridines. (Scheme 19a) [159]. Simple enaminone amides underwent an iodine-mediated and metal-free...
Rhodium-Catalyzed ortho-Selective C-F Activation and Hydrodefluorination of Heterocycle-Substituted Polyfluoroarenes: Dominated by Phosphine Ligands. Chem. Sel. 2017, 2, 1219–1224. [Google Scholar] Iwasaki, T.; Yamashita, K.; Kuniyasu, H.; Kambe, N. Co-catalyzed cross-coupling reaction of ...
A large planar heterocyclic compound consisting of four bridged pyrrole rings which binds Fe in biological systems for the transport or reactivity of oxygen. Heterocycle A ring-shaped compound made up of more than one kind of atom. Organic heterocyclic compounds consisting of a six-membered ring ...
The γ-carbonyl ester and γ-diketones are significant raw materials for the construction of five-membered heterocycle frameworks but their efficient and general accessibility in contemporary synthetic chemistry remains highly challenging32,33. As illustrated in Fig. 3 (lower part), the direct deoxyge...
Part 1: Five-Membered Aromatic Rings with One Heteroatom. Molecules 2021, 26, 483. 1. Introduction Coumarins are a family of benzopyrones (1,2-benzopyrones or 2H-[1]benzopyran- 2-ones), which represent an important family of oxygen-containing heterocycles, widely distribut...
In using the phrase "lixiviation systems using a ligand and an oxidant", Applicants include cyanide and air or dissolved oxygen; chloride and hypochlorite; bromide and bromine; iodide and iodine; thiocyanate and ferric ions; thiourea and ferric ions; ammonium thiosulfate, copper, ammonia, and air...
“Heterocyclic” or “heterocycle” or “heterocycloalkyl” or “heterocyclyl” refers to a saturated or partially saturated cyclic group having from 1 to 14 carbon atoms and from 1 to 6 heteroatoms selected from nitrogen, sulfur, or oxygen and includes single ring and multiple ring systems incl...