aromatic compound


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aromatic compound,

any of a large class of compounds that includes benzenebenzene
, colorless, flammable, toxic liquid with a pleasant aromatic odor. It boils at 80.1°C; and solidifies at 5.5°C;. Benzene is a hydrocarbon, with formula C6H6.
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 and compounds that resemble benzene in certain of their chemical properties. Originally applied to a small class of pleasant-smelling chemicals derived from vegetables, it now encompasses a wide diversity of compounds with no connection to the sense of smell. Common aromatic compounds other than benzene include toluene, naphthalene, and anthracene (all of which are present in coal tar). Each of these compounds contains at least one ring that consists of six carbon atoms, each joined to at least two other carbon atoms, and each joined to adjacent carbon atoms by one single and one double bond. The resulting hexagonal structure is characteristic of many aromatic compounds. The general rule is that aromatic molecules have 4n + 2 delocalized electrons (where n is an integral number). Thus the number of delocalized electrons in benzene (6), naphthalene (10), and anthracene (14) agree with their aromatic character. On the other hand, the eight-membered cyclic compound with four alternating double bonds (cyclooctatetraene) is not aromatic and shows reactivity similar to alkenesalkene
, any of a group of aliphatic hydrocarbons whose molecules contain one or more carbon-carbon double bonds (see chemical bond). Alkenes with only one double bond have the general formula CnH2n.
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. For this reason, the bonds in the aromatic ring are less reactive than ordinary double bonds; aromatic compounds tend to undergo ionic substitution (e.g., replacement of a hydrogen bonded to the ring with some other group) rather than addition (which would involve breaking one of the resonant bonds in the ring). Presence of the six-membered benzene ring is not essential for aromatic compounds; for example, furan, a heterocyclic compound that has a five-membered ring that includes an oxygen atom, has aromatic properties, as does pyridine, a heterocyclic compound whose six-membered ring includes a nitrogen atom.
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References in periodicals archive ?
The compound displayed an absorption bands at 207, 259, 263 and 267 nm, interpreted for aromatic compound. The IR spectrum displayed absorptions due to primary amine, hydroxyl function, pyridine ring (3450, 3386, 1611, 1452 and 812 cm-1) functionalities.
Anaerobic bacterial strain, C1Fd, was isolated from a consortium developed of bovine rumen that metabolized aromatic compounds such as phenol, catechol, 4-amino benzene, and p-phenylenediamine, under sulfate reducing conditions (Morlett et al., 2008b).
Uchihashi et al., "Anaerobic degradation of aromatic compounds by Magnetospirillum strains: isolation and degradation genes," Bioscience, Biotechnology, and Biochemistry, vol.
A total of 39 compounds were identified from the four samples with the major constituents being derivatives of 2-(2-phenylethyl) chromone aromatic compounds sesquiterpenes monoterpenes sterol compounds and fatty acid methyl ester.
Each strain produces different amounts of aromatic compounds, besides that the fermentations can be carried out in pure or mixed culture.
Dehalogenases involved in the aerobic dehalogenation of aromatic compounds are summarized in Table 1.
For a combination of aromatic compounds such a cooperative effect was reported for the mixture of "amsacrine-ethidium bromide" (EB), which was interpreted to be the consequence of the formation of a charge-transfer pair when both molecules are simultaneously intercalated in the neighbouring sites of DNA, as detected by EB fluorescence decay [107, 108].
Substantial difference between mechanism of sulfonation onto aliphatic and aromatic compounds has been observed.
Liverpool University scientists have managed to create nanoscale knots in the laboratory by mixing together two simple starting materials -- one a rigid aromatic compound and the other a more flexible amine linker.This is an unusual example of 'self-assembly', a process which underpins biology and allows complex structures to assemble from more simple building blocks.
The research team measured the levels of "typical traffic" pollutants in different parts of the urban area of Murcia, and calculated the quotients for the levels of an aromatic compound (benzene) and a hydrocarbon (n-hexane) at three Murcia petrol stations (near the petrol pumps and surrounding areas) to find the distance at which the service stations stop having an impact.
Key statement: This invention relates to a tire having at least one component of a silica reinforced rubber composition comprised of an emulsion polymerization derived terpolymer rubber which contains pendant hydroxyl groups, particularly derived from diene hydrocarbon and vinyl aromatic compound monomers, particularly a hydroxyalkyl methacrylate.
Research has shown a high degree of variability in the toast levels and aromatic compound content of oak barrels.