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Cyclononatetraene
CYCLONONATETRAENE is a organic compound with the formula C9H10. It is unstable and reorganized to cis-8,9-dihydroindene. CONTENTS * 1 Cyclononatetraenyl anion * 2 Cyclononatetraenyl cation * 3 See also * 4 References CYCLONONATETRAENYL ANIONCyclononatetraenyl 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. CYCLONONATETRAENYL CATIONCyclononatetraenyl cation is also stable by Möbius aromaticity
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Alkene
In organic chemistry , an ALKENE is an unsaturated hydrocarbon that contains at least one carbon –carbon double bond . The words alkene and olefin are often used interchangeably (see nomenclature section below). Acyclic alkenes, with only one double bond and no other functional groups , known as mono-enes, form a homologous series of hydrocarbons with the general formula C nH 2n. Alkenes have two hydrogen atoms fewer than the corresponding alkane (with the same number of carbon atoms). The simplest alkene, ethylene (C2H4), with the International Union of Pure and Applied Chemistry (IUPAC) name ethene, is the organic compound produced on the largest scale industrially. Aromatic
Aromatic
compounds are often drawn as cyclic alkenes, but their structure and properties are different and they are not considered to be alkenes
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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 . The polyene carotene is responsible for the orange colour of carrots . OPTICAL AND CHEMICAL PROPERTIESSome 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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Diene
In organic chemistry a DIENE (/ˈdaɪ.iːn/ DY-een ) or DIOLEFIN (/daɪˈoʊləfᵻn/ 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. CONTENTS * 1 Classes * 2 Synthesis of dienes * 3 Reactivity and uses * 3.1 Polymerization * 3.2 Cycloadditions * 3.3 Other addition reactions * 3.4 Metathesis reactions * 3.5 Acidity * 3.6 As ligands * 4 See also * 5 External links * 6 References CLASSESDienes 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
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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
ISO
). An implementation of the Handle System , 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
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J. Am. Chem. Soc.
The JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (also known as JACS) is a weekly peer-reviewed scientific journal that was established in 1879 by the American Chemical Society
American Chemical Society
. 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
University of Utah
). In 2014, the journal moved to a hybrid open access publishing model
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JSmol
JMOL is computer software for molecular modelling chemical structures in 3-dimensions . Jmol
Jmol
returns a 3D representation of a molecule that may be used as a teaching tool, 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
Linux
, and Unix , if Java is installed. It is free and open-source software released under a 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. For example, molecules can be displayed as ball-and-stick models , space-filling models , ribbon diagrams , etc
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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
DNA

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Chem. Rev.
CHEMICAL REVIEWS is a monthly peer-reviewed scientific journal published by the American Chemical Society
American Chemical Society
. It publishes review articles on all aspects of chemistry . It was established in 1924 by William Albert Noyes ( University of Illinois
University of Illinois
). As of 1 January 2015 the editor-in-chief is Sharon Hammes-Schiffer (University of Illinois at Urbana-Champaign). ABSTRACTING AND INDEXINGThe journal is abstracted and indexed in Chemical Abstracts Service , CAB International , EBSCOhost , ProQuest
ProQuest
, PubMed
PubMed
, Scopus , and the Science Citation Index . According to the Journal Citation Reports , the journal has a 2016 impact factor of 47.928
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Möbius Aromaticity
In organic chemistry , MöBIUS AROMATICITY is a special type of aromaticity believed to exist in a number of organic molecules . 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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Special
SPECIAL or SPECIALS may refer to: CONTENTS * 1 Music * 2 Film and television * 3 Other uses * 4 See also MUSIC * Special (album) , a 1992 album by Vesta Williams * "Special" (Garbage song) , 1998 * "Special" (Mew song) , 2005 * "Special" (Stephen Lynch song) , 2000 * The Specials
The Specials
, a British band * "Special", a song by Violent Femmes on The Blind Leading the Naked * "Special", a song on
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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". CONTENTS * 1 Regular nonagon * 2 Construction * 3 Symmetry * 4 Tilings * 5 Graphs * 6 Pop culture references * 7 Architecture * 8 See also * 9 References * 10 External links REGULAR NONAGONA regular nonagon is represented by Schläfli symbol {9} and has internal angles of 140°
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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. Other 'linear' notations include the Wiswesser Line Notation (WLN), ROSDAL and SLN
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International Chemical Identifier
The IUPAC
IUPAC
INTERNATIONAL CHEMICAL 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. Initially developed by IUPAC (International Union of Pure and Applied Chemistry) and NIST (National Institute of Standards and Technology) from 2000 to 2005, the format and algorithms are non-proprietary. The continuing development of the standard has been supported since 2010 by the not-for-profit INCHI TRUST, of which IUPAC
IUPAC
is a member. The current software version is 1.05 and was released in January 2017. Prior to 1.04, the software was freely available under the open source LGPL license, but it now uses a custom license called IUPAC- InChI Trust License
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ChemSpider
CHEMSPIDER is a database of chemicals . ChemSpider
ChemSpider
is owned by the Royal Society of Chemistry . CONTENTS * 1 Database * 2 Crowdsourcing * 3 Searching * 4 Chemistry document mark-up * 5 History * 6 Services * 6.1 SyntheticPages * 6.2 Open PHACTS * 7 See also * 8 References DATABASEThe database contains information on more than 63 million molecules from over 280 data sources including: * EPA DSSTox * U.S
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Molar Mass
In chemistry , the MOLAR MASS M is a physical property defined as the mass of a given substance (chemical element or chemical compound ) divided by the amount of substance . The base SI unit for molar mass is kg /mol . However, for historical reasons, molar masses are almost always expressed in g/mol. As an example, the molar mass of water: M(H2O) ≈ 6998180148800000000♠18.01488 g/mol
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