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*  Intramolecular Heck reaction
The reaction may be used to produce carbocyclic or heterocyclic organic compounds with a variety of ring sizes. Chiral ... Ring sizes produced by the intramolecular Heck reaction range from four to twenty-seven atoms. Additionally, in the presence of ... 5) The intramolecular Heck reaction may be used to form rings of a variety of sizes and topologies. β-Hydride elimination need ... This section discusses the most common ring sizes formed by the intramolecular Heck reaction and some of its tandem and ...
*  Sonogashira coupling
... compound F. Compound F continues to react with the palladium intermediate B, with regeneration of the copper halide, G. ... Nucleophilic N-heterocyclic carbenes (NHCs) behave like typical σ-donor ligands that can substitute 2-electron ligands (i.e., ... The recyclable polymeric phosphane ligand shown below is obtained from ring-opening metathesis polymerization of a norbornene ... The active palladium catalyst is the 14 electron compound Pd0L2, complex A, which reacts with the aryl or vinyl halide in an ...
*  1,4,2-Dithiazole
2-Dithiazole is a heterocyclic compound consisting of an unsaturated five-membered ring containing two carbon atoms, one ... These compounds may be protonated by strong acids to give synthetically useful aromatic cations. Argyropoulos, Nikolaos G. ( ... Wai, Kwok-Fai; Sammes, Michael P. (1992). "Dithiazoles and related compounds. Part. 4. Preparation of 1,4,2-dithiazolium salts ... 2-Dithiazole compounds may be formed by the reaction of nitrile sulfide (formed by the thermolysis of oxathiazolone) with ...
*  Pterin
... is a heterocyclic compound composed of a pteridine ring system, with a keto group and an amino group on positions 4 and ... They are critical compounds in a large number of biological group transfer reactions. These folate-dependent biosynthetic ... Folates are pterins that contain p-aminobenzoic acid connected to the methyl group at position 6 of the pteridine ring system ( ... Pterins, as a group, are compounds that are derivatives of the basic pterin structure, described in the beginning, with ...
*  1,2-Butylene carbonate
It is also an heterocyclic compound with a five-membered ring, and can be seen as a derivative of dioxolane, specifically 4- ... 1,2-Butylene carbonate is an organic compound with formula C 5H 8O 3, or (H5C2)(C2H3)(CO3). It is a double ester with the ...
*  Triazolate
... both of which are unsaturated heterocyclic ring compounds containing three nitrogen atoms. The basic formula is C2N3H4−. It can ... This enables polymers or metal organic framework compounds to be formed. Triazolate can also be substituted on its carbon atoms ... Katritzky, Alan R. (2002). Advances in Heterocyclic Chemistry. Academic Press. p. 167. ISBN 9780080493572. Zhu, AX; Lin, JB; ... be abbreviated by "tz". Known compounds include zinc, and natural copper minerals, chanabayaite and triazolite. Trizolate is a ...
*  Pyrrole
... is a heterocyclic aromatic organic compound, a five-membered ring with the formula C4H4NH. It is a colorless volatile ... Part I. The Synthesis and the Physical and Chemical Aspects of the Pyrrole Ring. The Chemistry of Heterocyclic Compounds. 48. ... Heterocyclic Compounds. 1. New York, NY: Wiley. p. 309. Mosher, H. S. (1950). Elderfield, Robert Cooley, ed. Heterocyclic ... wherein the pyrrolidine ring of proline is oxidized twice through FAD+ to yield pyrrole ring A. Ring A is then expanded via the ...
*  Isonipecotic acid
... is a heterocyclic compound which acts as a GABAA receptor partial agonist. It consists of a piperidine ring ... with a carboxylic acid moiety in the iso position (and as such is also known as "4-piperidinecarboxylic acid"). Mortensen M, ...
*  Trans-2,3-Butylene carbonate
It is also an heterocyclic compound with a five-membered ring containing two oxygen atoms, and can be viewed as a derivative of ... The compound is an aprotic polar solvent and has been proposed as an ingredient of the electrolyte of lithium batteries. cis-2, ... trans-2,3-Butylene carbonate is an organic compound with formula C 5H 8O 3, or (H3C)2(C2H2)(CO3). It is an ester with a ...
*  Cis-2,3-Butylene carbonate
It is also an heterocyclic compound with a five-membered ring containing two oxygen atoms, and can be viewed as a derivative of ... The compound is an aprotic polar solvent. The bacterium Pseudomonas diminuta will hydrolyze this compound but not its ... cis-2,3-Butylene carbonate is an organic compound with formula C 5H 8O 3, or (H3C)2(C2H2)(CO3). It is an ester with a carbonate ...
*  Diazepine
... is a seven-membered heterocyclic compound with two nitrogen atoms (e.g., in ring positions 1 and 2). Types include: 1 ... it is the basis of the benzodiazepine family of compounds. In these compounds the nitrogen atoms are at the 1 and 5 positions ... as, for example, in clobazam (depending on the position of the fused benzene ring, the nitrogen atoms are also given numbers 1 ... 2-diazepine 1,3-diazepine 1,4-diazepine When combined with a benzene ring, ...
*  Dibenzo-1,4-dioxin
... is a polycyclic heterocyclic organic compound in which two benzene rings are connected by a 1,4-dioxin ring. Its molecular ... Dioxins and dioxin-like compounds is a category of pollutants that includes PCDDs and other compounds that have similar ... The isomeric compound dibenzo-o-dioxin (dibenzo-ortho-dioxin) or dibenzo-1,2-dioxin, like the unstable 1,2-dioxin, has two ... The two oxygen atoms occupy opposite (para-) positions in the six-membered dioxin ring. Dibenzodioxin is the carbon skeleton of ...
*  Heptachlorodibenzo-p-dioxin
It is a polycyclic heterocyclic organic compound, since HpCDD contains multiple cyclic structures (two benzene rings connected ... The known adverse effects for dioxin compounds are (as previously mentioned) carcinogenicity. Furthermore, chloroacne, ... for dioxin-like compounds to derive systemic or human-specific TEFs to improve human risk assessment. Claes Bernes: Persistent ... are members of its rings. HpCDD has molecular formula C12HCl7O2 and is an off-white powder, which is insoluble in water. ...
*  Dihydropyran
... is a heterocyclic compound with the formula C5H8O. The six-membered, non-aromatic ring has five carbon atoms and ... The indicated hydrogen is placed just in front of the parent hydride (pyran). Note that the position numbers of the ring- ... pyran tetrahydropyran A Guide to IUPAC Nomenclature of Organic Compounds (Recommendations 1993): R-3.1.2 Hydro prefixes A Guide ... refers to the two added hydrogen atoms needed to remove one double bond from the parent compound pyran. The numbers in front of ...
*  Oxazines
... are heterocyclic compounds containing one oxygen and one nitrogen atom in a doubly unsaturated six-membered ring. ... Dioxazines are pentacyclic compounds consisting of two oxazine subunits. A commercially important example is the pigment ... Hatsuo Ishida And Tarek Agag, Elsevier B.V., 2011, ISBN 978-0-444-53790-4 Oxazines at the US National Library of Medicine ... By extension, the derivatives are also referred to as oxazines; examples include ifosfamide and morpholine (tetrahydro-1,4- ...
*  Thiazepine
... s are substituted thiepins, with a nitrogen replacing a carbon in the seven-membered heterocyclic compound. Depending ... Benzothiazepines have a single benzene attached to the ring, while dibenzothiazepines have two. Diltiazem, a benzothiazepine, ... on the location of the nitrogen, one distinguishes 1,3-thiazepine and 1,4-thiazepine. ...
*  Pyrimidine
The pyrimidine ring system has wide occurrence in nature as substituted and ring fused compounds and derivatives, including the ... six-membered heterocyclics with two nitrogen atoms in the ring), it has the nitrogen atoms at positions 1 and 3 in the ring. ... Heterocyclic Compounds. 6. New York: Wiley. p. 235. Pinner, A. (1884). "Ueber die Einwirkung von Acetessigäther auf die Amidine ... As is often the case with parent heterocyclic ring systems, the synthesis of pyrimidine is not that common and is usually ...
*  Thienotriazolodiazepine
A thienotriazolodiazepine is a heterocyclic compound containing a diazepine ring fused to thiophene and triazole rings. ... 4-Benzodiazepines and Analogues Using Cholesteryl-10-Undecenoate Bonded Phase in Microcolumn Liquid Chromatography". Journal of ... 4-benzodiazepines (such as diazepam) and triazolobenzodiazepines (such as alprazolam). Thienotriazolodiazepines that are not ...
*  Pteridine
... is an aromatic chemical compound composed of fused pyrimidine and pyrazine rings. A pteridine is also a group of ... heterocyclic compounds containing a wide variety of substitutions on this structure. Pterins and flavins are classes of ... The enzyme dihydropteroate synthetase converts pteridine and 4-aminobenzoic acid to dihydrofolic acid in the presence of ...
*  Furanolactone
A furanolactone is a heterocyclic chemical compound that contains both a lactone and a furan ring structure. Examples include: ... selective modification of the furan ring". Bioorg Med Chem Lett. 16 (12): 3170-4. doi:10.1016/j.bmcl.2006.03.062. Kohno H, ... The salvinorins, including the hallucinogenic compound salvinorin A Columbin, a bitter diterpenoid from Calumbae Radix ...
*  Thiolactone
... s are a class of heterocyclic compounds in organic chemistry. They are analogs of the more common lactones in which ... Thiolactone rings can also be found in peptides synthesized by bacteria such as Staphylococcus aureus in order to regulate ... The sulfur atom is within the ring system and adjacent to a carbonyl group. Thiolactones can be prepared by dehydration of ... β-Thiolactones can be opened by reaction at the 4-position via SN2 nucleophilic reactions. The most common thiolactone, ...
*  Ring (chemistry)
... "polycyclic ring system". Cyclic compound Polycyclic compound Heterocyclic compound Bicyclic molecule Spiro compound IUPAC, ... "polycyclic ring", "fused ring", "spiro ring" and "indole ring", where clearly a polycyclic ring system is intended. Likewise, a ... A heterocycle or heterocyclic ring is a ring containing atoms of at least two different elements, i.e. a non-homocyclic ring. A ... A molecule containing no rings is called an acyclic or open-chain compound. A homocycle or homocyclic ring is a ring in which ...
*  Pyrimidone
... is the name given to either of two heterocyclic compounds with the formula C4H4N2O: 2-pyrimidone and 4-pyrimidone. ... ring. Derivatives of pyrimidone are the basis of many other biological molecules, including: Nucleobases, such as cytosine ... The compounds can also be called 2-hydroxypyrimidine or 4-hydroxypyrimidine respectively, based on a substituted pyrimidine, or ...
*  Thiopyrylium
2009). Aromaticity in Heterocyclic Compounds. Volume 19 of Topics in Heterocyclic Chemistry. Springer. pp. 219-220. ISBN ... 6-membered aromatic rings (benzene) with one carbon replaced by a different atom: borabenzene, pyridine, pyrylium, thiopyrylium ... The thiopyrylium analogue of 2,4,6-trisubstituted pyrylium salts can be synthesized by treatment with sodium sulfide followed ...
*  Martinet dioxindole synthesis
Dioxindole is a non-aromatic heterocyclic organic compound. It has a bicyclic structure consisting of a six-membered aromatic ... a ring closing reaction occurs by the bond from the aromatic benzene ring attacking the partially positive carbonyl to form a ... Peddibhotla, S. (2009). "Current Bioactive Compounds". Current Bioactive Compounds. 5 (1): 20-38. doi:10.2174/ ... 3-substituted-3-hydroxy-2-oxindole is the central structure of a wide variety of biologically important compounds found in ...
*  Metabolism
These bases are heterocyclic rings containing nitrogen, classified as purines or pyrimidines. Nucleotides also act as coenzymes ... Organic compounds (proteins, lipids and carbohydrates) contain the majority of the carbon and nitrogen; most of the oxygen and ... These compounds are made by the assembly and modification of isoprene units donated from the reactive precursors isopentenyl ... Here, the isoprene units are joined together to make squalene and then folded up and formed into a set of rings to make ...
*  3-Benzoxepin
Oxepin Ring Systems Containing Two Rings". Seven-Membered Heterocyclic Compounds Containing Oxygen and Sulfur. The Chemistry of ... 3-Benzoxepin itself is a non-natural compound, but the bicyclic ring system is part of the naturally occurring compounds ... 3-Benzoxepin is an annulated ring system with an aromatic benzene ring and a non-aromatic, unsaturated, oxygen-containing seven ... The latter compound can be synthesized from α,α′-dibromodimethyl ether (bis(bromomethyl)ether or BBME) which is accessible from ...