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  • sextets
  • According to Clar's rule , the resonance structure of a PAH that has the largest number of disjoint aromatic pi sextets -i.e. benzene -like moieties-is the most important for the characterization of the properties of that PAH. (wikipedia.org)
  • In the Clar sextet case, the most stable structure for coronene has only the three isolated outer sextets as fully aromatic although superaromaticity would still be possible when these sextets are able to migrate into the next ring. (wikipedia.org)
  • perylene
  • Benzopyrene is a component of pitch and occurs together with other related pentacyclic aromatic species such as picene, benzofluoranthenes, and perylene. (wikipedia.org)
  • naphthalene
  • The first proposed mechanism for a thermal rearrangement of an aromatic compound was for the automerization of naphthalene. (wikipedia.org)
  • This is currently the preferred mechanism and is as follows: The isomerization of unsubstituted azulene to naphthalene was the first reported thermal transformation of an aromatic hydrocarbon, and has consequently been the most widely studied rearrangement. (wikipedia.org)
  • known
  • Hexamethylbenzene, also known as mellitene, is a hydrocarbon with the molecular formula C12H18 and the condensed structural formula C6(CH3)6. (wikipedia.org)
  • reactions
  • An example of electrophilic aromatic substitution is the nitration of salicylic acid: In coupling reactions a metal catalyses a coupling between two formal radical fragments. (wikipedia.org)
  • systems
  • Orthorhombic orange-yellow crystals of a 1:1 mixture of picryl chloride and hexamethylbenzene have been reported to possess alternating stacks of each component, probably due to π-stacking of the aromatic systems. (wikipedia.org)
  • Food
  • The EU-RL for polycyclic aromatic hydrocarbons in Feed and Food as laid down in Regulation (EC) No 882/2004 and Directive 96/23/EC contributes to the implementation of high quality implementation and uniform results. (wur.nl)
  • dioxins
  • Over a four-day period the team exposed young female rats to a combination of 18 PHAHs (polyhalogenated aromatic hydrocarbons) comprising 2 dioxins, 4 dibenzofurans, and 12 PCBs, at six doses reflecting typical concentrations measured in tested breast milk and in fish and other foods. (ndnr.com)
  • The balance of the bay remains contaminated by numerous chemicals including phthalates, dioxins, lead, heavy metals and polycyclic aromatic hydrocarbons (coal tars), but to a lesser extent than the areas closer to the sea wall on the eastern shore of the bay. (wikipedia.org)
  • mixture
  • describe the laboratory preparation of numerous perfluorocarbons by the vapour phase reaction of a hydrocarbon with cobalt(III) fluoride, at a pilot plant scale, in particular, perfluoro-n-heptane and perfluorodimethylcyclohexane (mixture of 1,3-isomer and 1,4 isomer), and on an industrial scale by Du Pont. (wikipedia.org)