benzene ring

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Related to benzene rings: benzoic acid, toluene

ring

 [ring]
1. any annular or circular organ, structure, or area.
2. in chemistry, a collection of atoms united in a continuous or closed chain.
abdominal ring, external an opening in the aponeurosis of the external oblique muscle for the spermatic cord or round ligament.
abdominal ring, internal an aperture in the transverse fascia for the spermatic cord or round ligament.
Albl's ring a ring-shaped shadow in radiographs of the skull, caused by aneurysm of a cerebral artery.
Bandl's ring see bandl's ring.
benzene ring the hexagon representing the arrangement of carbon atoms in a molecule of benzene, different compounds being derived by replacement of the hydrogen atoms by different elements or compounds.
Cannon's ring a focal contraction seen radiographically at the mid-third of the transverse colon, marking an area of overlap between the superior and inferior nerve plexuses.
conjunctival ring a ring at the junction of the conjunctiva and cornea.
constriction ring a contracted area of the uterus, where the resistance of the uterine contents is slight, as over a depression in the contour of the fetus, or below the presenting part.
fibrous ring of heart anulus fibrosus.
halo ring a metal orthosis used for traction in the treatment of spinal cord injuries. The halo apparatus can maintain stability and alignment of the cervical vertebrae while the patient is out of bed.
inguinal ring, deep an aperture in the transverse fascia for the spermatic cord or the round ligament.
inguinal ring, external superficial inguinal ring.
inguinal ring, internal deep inguinal ring.
inguinal ring, superficial an opening in the aponeurosis of the external oblique muscle for the spermatic cord or the round ligament.
Kayser-Fleischer ring a golden brown or green discoloration in the zone of Descemet's membrane in the limbic region of the cornea seen in wilson's disease and other liver disorders.
pathologic retraction ring a complication of prolonged labor marked by failure of relaxation of the circular fibers at the internal opening of the cervix, obstructing delivery of the infant. See also bandl's ring.
physiologic retraction ring the demarcation between the upper, contracting portion of the uterus in labor and the lower, dilating part.
Schwalbe's ring a circular ridge composed of collagenous fibers surrounding the outer margin of Descemet's membrane.
tympanic ring the bony ring forming part of the temporal bone at birth and developing into the tympanic plate.
umbilical ring the orifice in the abdominal wall of the fetus for transmission of the umbilical vein and arteries.
vascular ring a congenital anomaly of the aortic arch and its tributaries, the vessels forming a ring about the trachea and esophagus and causing varying degrees of compression.

ben·zene ring

the closed-chain arrangement of the carbon and hydrogen atoms in the benzene molecule.
See also: cyclic compound.

benzene ring

n.
A hexagonal ring arrangement found in benzene and other aromatic compounds, consisting of six carbon atoms with alternating single and double bonds between them, and with each carbon atom bonded to a hydrogen atom, or to other atoms or groups of atoms in derivatives of benzene.

benzene ring

A closed aromatic structure composed of 6 carbon atoms linked with alternating single- and double-hydrogen bonds—2 atoms in the orbital and 1 atom in the π orbital.

ben·zene ring

(ben'zēn ring)
The closed-chain arrangement of the carbon and hydrogen atoms in the benzene molecule.
See also: cyclic compound

benzene ring,

benzene

a liquid hydrocarbon, C6H6, from coal tar; used as a solvent.

benzene hexachloride
a chlorinated hydrocarbon. The gamma isomer was used extensively as an insecticide. Called also Gammexane, lindane.
benzene hexachloride poisoning
benzene ring
the closed hexagon of carbon atoms in benzene, from which the different benzene compounds are derived by replacement of the hydrogen atoms.
References in periodicals archive ?
66 (2 H) indicated that 4 had an 1,4-di-substituted benzene ring.
Complexing patterns of this type are quite common for the similar compounds with single or isolated carboxyl groups attached to the benzene ring such as benzoic, p-phthalic, 3-hydroxybenzoic, 3,4-dihydroxybenzoic, gallic, etc.
This increases the chances for benzene ring decomposition and carbon defect formation.
In these three crystals, the planes between imidazole ring and the substituted benzene ring are not co-plane and the intersection angles are 65.
Due to the Conjugative effects between benzene ring and lonepairelectron of nitrogen atoms, the bond formed between N and benzene ring is more stability than that formed N with aliphatic chain (29).
He next tried to attach six benzene rings to two carbon atoms hooked together, thus forming hexaphenylethane.
4 Hz) splitted at A2B2 pattern, and thus were attested for a p-substituted benzene ring.
XRD study was performed to investigate whether the crystal forms in the crystalline portion of PEEKs might be influenced or altered by the presence of DFBP isomers with orthosubstitution and the number of benzene rings.
He attached benzene rings to the long carbon chains of the fatty acids that make up fats.
The body consists of six benzene rings that join to form a cylinder.
The magnetic torque, occurring as a result of the motion of the existing electrons and distortions of the electron clouds within the benzene rings, can be sufficiently large to induce appreciable orientation and alignment of the molecules [24, 36, 37].