aromatic ring


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Related to aromatic ring: Aromatic compounds, benzene ring

aromatic ring,

n closed ring structure formed by six carbon atoms, with a single hydrogen atom attached to each one. Also called a
phenyl ring or a
benzene ring.
References in periodicals archive ?
1]) Functionality Vibrating type (a) 3,450-3,400 -OH of alcohols, phenols O-H stretching and acids 2,970-2,900 -CH, CH2 and CH3 C--H stretching 1,750-1,720 C=O of esters, ketones, C=O stretching aldehydes and acids 1,700-1,350 C=O and C=C C=O and C=C stretching 1,455-1,420 Aromatic ring Benzene ring stretching 1,035-1,025 C-O-C Deformation (a) From Rodrigues et al.
The stiffness of the ester groups and the aromatic rings is balanced by the flexibility and mobility of the butylene group.
1] are due to the group vibrational frequencies of C-H for both aromatic rings of bisphenol-A and (C[H.
XPS spectra show the existence of nitrogen incorporated both into aromatic rings and as terminator radicals.
However, [sigma]-binding predominates in the case the substituents of aromatic ring contain electronegative atoms with lone-pair electrons and the cesium cation lies close to the plane of the benzene ring.
As anticipated, substitution on the aromatic ring with an electrondonating group ([Et.
The diolefins produced thus far have consisted of a central aromatic ring until with 2- and 4vinyl pyridine groups at symmetric positions.
The purpose of this study is the design, syntheses and pharmacological evaluations of PCP analogs with fluorine and/or hydroxy groups on the aromatic ring to gain knowledge about the structural demands for ligands with high affinity and selectivity for those PCP binding sites.
Chemically, phenolics can be defined as substances possessing an aromatic ring bearing one or more hydroxy substituents, including their functional derivatives.
Although humic and fulvic acid molecules exhibit structural complexity, several unique features are noted: 1) a humic acid molecule can be considered to be a polymer with aromatic ring structure representing the monomer and 2) acidic functional groups, such as carboxylic acids are attached to the rings and can ionize as a function of pH, giving a negative charge.
The relative importance of the planar fused ring(s) versus the nature of the aromatic ring substituted at the oxazole two position on the pi-radical reactivity toward a weak proton donor is investigated and discussed.
Their analysis confirms theoretical predictions that the addition of nitro groups weakens the carbon-carbon links in the aromatic ring.