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Cyclononatetraene
Cyclononatetraene
Cyclononatetraene
is an organic compound with the formula C9H10. It is unstable and reorganized to cis-8,9-dihydroindene.[1]Contents1 Cyclononatetraenyl anion 2 Cyclononatetraenyl cation 3 See also 4 ReferencesCyclononatetraenyl anion[edit] Cyclononatetraenyl anion is stable. There are two cyclononatetraenyl anion:trans,cis,cis,cis-Cyclononatetraenyl Anion(Pac-Man shape) and cis,cis,cis,cis-cyclononatetraenyl anion(regular nonagon shape). cis,cis,cis,cis-cyclononatetraenyl anion is more stable than trans,cis,cis,cis-cyclononatetraenyl anion.[2] Cyclononatetraenyl cation[edit] Cyclononatetraenyl cation is also stable by Möbius aromaticity.[3][4] See also[edit]Cyclopentadiene Cyclooctatetraene Cycloheptatriene AzonineReferences[edit]^ Radlick, Phillip; Gary Alford (1969), "Preparation and isolation of cis, cis, cis, cis-1,3,5,7-cyclononatetraene", J. Am. Chem
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JSmol
Jmol
Jmol
is computer software for molecular modelling chemical structures in 3-dimensions.[2] Jmol
Jmol
returns a 3D representation of a molecule that may be used as a teaching tool,[3] or for research e.g., in chemistry and biochemistry. It is written in the programming language Java, so it can run on the operating systems Windows, macOS, Linux, and Unix, if Java is installed. It is free and open-source software released under a GNU Lesser General Public License
GNU Lesser General Public License
(LGPL) version 2.0. A standalone application and a software development kit (SDK) exist that can be integrated into other Java applications, such as Bioclipse and Taverna. A popular feature is an applet that can be integrated into web pages to display molecules in a variety of ways
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Special
Special
Special
or specials may refer to:Contents1 Music 2 Film and television 3 Other uses 4 See alsoMusic[edit] Special
Special
(album), a 1992 album by Vesta Williams "Special" (Garbage song), 1998 "Special
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Aromatic
In organic chemistry, the term aromaticity is used to describe a cyclic (ring-shaped), planar (flat) molecule with a ring of resonance bonds that exhibits more stability than other geometric or connective arrangements with the same set of atoms. Aromatic molecules are very stable, and do not break apart easily to react with other substances. Organic compounds that are not aromatic are classified as aliphatic compounds—they might be cyclic, but only aromatic rings have special stability (low reactivity). Since the most common aromatic compounds are derivatives of benzene (an aromatic hydrocarbon common in petroleum and its distillates), the word “aromatic” occasionally refers informally to benzene derivatives, and so it was first defined. Nevertheless, many non-benzene aromatic compounds exist. In living organisms, for example, the most common aromatic rings are the double-ringed bases in RNA
RNA
and DNA
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Cyclooctene
Cyclooctene
Cyclooctene
is a cycloalkene with an eight-membered ring. It is notable because it is the smallest cycloalkene that can exist as either the cis- or trans-isomer with the cis-isomer more common. Its most stable cis stereoisomer can adopt various conformations, the most stable one being shaped like a ribbon;[1] its most stable trans-conformer is shaped like the 8-carbon equivalent chair conformation of cyclohexane. See also[edit]cis-Cyclooctene trans-CycloocteneReferences[edit]^ Neuenschwander, Ulrich; Hermans, Ive (2011). "The Conformations of Cyclooctene: Consequences for Epoxidation Chemistry". J. Org. Chem. 76 (24): 10236–10240
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ChemSpider
ChemSpider
ChemSpider
is a database of chemicals. ChemSpider
ChemSpider
is owned by the Royal Society of Chemistry.[3][4][5][6][7][8][9][10][11][12][13]Contents1 Database 2 Crowdsourcing 3 Searching 4 Chemistry document mark-up 5 History 6 Services6.1 SyntheticPages 6.2 Open PHACTS7 See also 8 ReferencesDatabase[edit] The database contains information on more than 63 million molecules from over 280 data sources including:EPA DSSTox[14][15] U.S
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Diene
In organic chemistry a diene (/ˈdaɪ.iːn/ DY-een) or diolefin (/daɪˈoʊləfɪn/ dy-OH-lə-fin) is a hydrocarbon that contains two carbon double bonds. Dienes occur occasionally in nature. Conjugated dienes are widely used as monomers in the polymer industry.Contents1 Classes 2 Synthesis of dienes 3 Reactivity and uses3.1 Polymerization 3.2 Cycloadditions 3.3 Other addition reactions 3.4 Metathesis reactions 3.5 Acidity 3.6 As ligands4 See also 5 External links 6 ReferencesClasses[edit] Dienes can be divided into three classes, depending on the relative location of the double bonds:Cumulated dienes have the double bonds sharing a common atom as in a group of compounds called allenes. Conjugated dienes have conjugated double bonds separated by one single bond. Unconjugated dienes have the double bonds separated by two or more single bonds. They are usually less stable than isomeric conjugated dienes
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Chem. Rev.
Chemical Reviews
Chemical Reviews
is peer-reviewed scientific journal published twice per month by the American Chemical Society. It publishes review articles on all aspects of chemistry. It was established in 1924 by William Albert Noyes (University of Illinois). As of 1 January 2015[update] the editor-in-chief is Sharon Hammes-Schiffer ( University of Illinois
University of Illinois
at Urbana-Champaign).[1] Abstracting and indexing[edit] The journal is abstracted and indexed in Chemical Abstracts Service, CAB International, EBSCOhost, ProQuest, PubMed, Scopus, and the Science Citation Index. According to the Journal Citation Reports, the journal has a 2016 impact factor of 47.928.[2] References[edit]^ " Sharon Hammes-Schiffer joins Chemical Reviews
Chemical Reviews
as new editor-in-chief". ACS Chemistry
Chemistry
for Life
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J. Am. Chem. Soc.
The Journal of the American Chemical Society
American Chemical Society
(also known as JACS) is a weekly peer-reviewed scientific journal that was established in 1879 by the American Chemical Society.[1] The journal has absorbed two other publications in its history, the Journal of Analytical and Applied Chemistry
Chemistry
(July 1893) and the American Chemical Journal (January 1914). It publishes original research papers in all fields of chemistry. Since 2002, the journal is edited by Peter J. Stang (University of Utah).[2] In 2014, the journal moved to a hybrid open access publishing model. Abstracting and indexing[edit] The Journal of the American Chemical Society
American Chemical Society
is abstracted and indexed in Chemical Abstracts Service, Scopus, EBSCOhost, Thomson-Gale, ProQuest, PubMed, Web of Science, and SwetsWise
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Triene
Polyenes are poly-unsaturated organic compounds that contain at least three alternating double and single carbon–carbon bonds. These carbon–carbon double bonds interact in a process known as conjugation resulting in some unusual optical properties. Related to polyenes are dienes, where there are only two alternating double and single bonds. The following polyenes are used as antibiotics for humans: amphotericin B, nystatin, candicidin, pimaricin, methyl partricin, and trichomycin.[1]The polyene carotene is responsible for the orange colour of carrots.Optical and chemical properties[edit] Some polyenes are brightly colored, an otherwise rare property for a hydrocarbon. Normally alkenes absorb in the ultraviolet region of a spectrum, but the absorption energy state of polyenes with numerous conjugated double bonds can be lowered such that they enter the visible region of the spectrum, resulting in compounds which are coloured
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Digital Object Identifier
In computing, a Digital Object Identifier or DOI is a persistent identifier or handle used to uniquely identify objects, standardized by the International Organization for Standardization
International Organization for Standardization
(ISO).[1] An implementation of the Handle System,[2][3] DOIs are in wide use mainly to identify academic, professional, and government information, such as journal articles, research reports and data sets, and official publications though they also have been used to identify other types of information resources, such as commercial videos. A DOI aims to be "resolvable", usually to some form of access to the information object to which the DOI refers. This is achieved by binding the DOI to metadata about the object, such as a URL, indicating where the object can be found. Thus, by being actionable and interoperable, a DOI differs from identifiers such as ISBNs and ISRCs which aim only to uniquely identify their referents
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Möbius Aromaticity
In organic chemistry, Möbius aromaticity
Möbius aromaticity
is a special type of aromaticity believed to exist in a number of organic molecules. [1] [2] In terms of molecular orbital theory these compounds have in common a monocyclic array of molecular orbitals in which there is an odd number of out-of-phase overlaps, the opposite pattern compared to the aromatic character to Hückel systems. The nodal plane of the orbitals, viewed as a ribbon, is a Möbius strip, rather than a cylinder, hence the name. The pattern of orbital energies is given by a rotated Frost circle (with the edge of the polygon on the bottom instead of a vertex), so systems with 4n electrons are aromatic, while those with 4n + 2 electrons are anti-aromatic/non-aromatic
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Nonagon
In geometry, a nonagon /ˈnɒnəɡɒn/ (or enneagon /ˈɛniːəɡɒn/) is a nine-sided polygon or 9-gon. The name "nonagon" is a prefix hybrid formation, from Latin
Latin
(nonus, "ninth" + gonon), used equivalently, attested already in the 16th century in French nonogone and in English from the 17th century. The name "enneagon" comes from Greek enneagonon (εννεα, "nine" + γωνον (from γωνία = "corner")), and is arguably more correct, though somewhat less common than "nonagon".Contents1 Regular nonagon 2 Construction 3 Symmetry 4 Tilings 5 Graphs 6 Pop culture references 7 Architecture 8 See also 9 References 10 External linksRegular nonagon[edit] A regular nonagon is represented by Schläfli symbol
Schläfli symbol
9 and has internal angles of 140°
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International Chemical Identifier
The IUPAC
IUPAC
International Chemical Identifier
Identifier
(InChI /ˈɪntʃiː/ IN-chee or /ˈɪŋkiː/ ING-kee) is a textual identifier for chemical substances, designed to provide a standard way to encode molecular information and to facilitate the search for such information in databases and on the web
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Simplified Molecular-input Line-entry System
The simplified molecular-input line-entry system (SMILES) is a specification in form of a line notation for describing the structure of chemical species using short ASCII
ASCII
strings. SMILES strings can be imported by most molecule editors for conversion back into two-dimensional drawings or three-dimensional models of the molecules. The original SMILES specification was initiated in the 1980s. It has since been modified and extended. In 2007, an open standard called OpenSMILES was developed in the open-source chemistry community
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Chemical Formula
A chemical formula is a way of information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus (+) and minus (−) signs. These are limited to a single typographic line of symbols, which may include subscripts and superscripts. A chemical formula is not a chemical name, and it contains no words. Although a chemical formula may imply certain simple chemical structures, it is not the same as a full chemical structural formula. Chemical formulas can fully specify the structure of only the simplest of molecules and chemical substances, and are generally more limited in power than are chemical names and structural formulas. The simplest types of chemical formulas are called empirical formulas, which use letters and numbers indicating the numerical proportions of atoms of each type
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