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.
References in periodicals archive ?
In general, sulfonation of aromatic compounds, using substituents of the first class (N[R.
1 Benzene ring: A regular hexagonal ring structure consisting of six carbon atoms, found in such aromatic compounds as benzene.
The high content of aliphatic hydrocarbons and low content of aromatic compounds reveal that the skeletal structure of oil shale kerogen is mainly composed of long-chain aliphatic alkyls and few aromatic rings.
Most studies on the health effects of polycyclic aromatic compounds (PAHs) have considered only the presence of these chemicals in the particle phase, but the contribution of PAHs in the gas phase has largely been ignored.
Notwithstanding the test of time, the researchers discovered malt sugars and aromatic compounds in the pale golden liquid, along with hops that are still used in today's beer.
3]/100 g, 5-80 phr of at least one mineral oil plasticizer that has a content of polycyclic aromatic compounds determined with the DMSO extract according to the IP 346 method of less than 3% by weight relative to the total weight of the mineral oil plasticizer, and 5-30 phr of at least one resin with an average molecular weight determined with GPC of less than 400 g/mol and a softening point (ring and ball according to ASTM E 28) of less than 40[degrees]C.
It consists of six chapters covering heavy analogs of: carbenium, free radicals, carboanions, carbenes, unsaturated hydrocarbons, and aromatic compounds.
It is produced when sugars enter a plant's shikimate pathway, which creates a link between the processing of sugars and the generation of aromatic compounds.
Pseudoallergic reactions are non-allergy-mediated hypersensitivity reactions that may result from ingestion of artificial food additives or from consumption of salicylates, benzoates, histamine, or various aromatic compounds that occur naturally in some fruits, vegetables, spices, or other foods.