cyclic compound

(redirected from heterocyclic compound)
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

cy·clic com·pound

any compound in which the constituent atoms, or any part of them, form a ring. Used mainly in organic chemistry where: 1) numerous compounds contain rings of carbon atoms (carbocyclic compounds) or carbon atoms plus one or more atoms of other types (heterocyclic compounds), usually nitrogen, oxygen, or sulfur; 2) where the atoms in the ring are all of the same element (homocyclic or isocyclic compound); 3) where the ring is saturated or contains nonconjugated double bonds (alicyclic compound), the compound is similar in properties to the corresponding acyclic compound (for example, cyclohexane resembles hexane); 4) where the ring contains conjugated double bonds in a closed loop in which there are 4n + 2 (where n is an integer) delocalized π electrons (Hückel rule) (aromatic compound; for example, benzene, pyridine), it is more stable than the corresponding saturated ring and exhibits unusual chemical properties characteristic of itself and not of other types of rings or of acyclic compounds. These aromatic compounds have the ability to sustain an induced ring current.

cy·clic com·pound

(sik'lik kom'pownd)
Any compound in which the constituent atoms, or any part of them, form a ring. Used mainly in organic chemistry.
Synonym(s): closed chain compound.
References in periodicals archive ?
Lipid-derived compounds in meat volatiles have greater odour threshold values (Table 3) as opposed to sulfur- and nitrogen-containing heterocyclic compounds which make them less aroma significant.
These nanoparticles have been found useful in the synthesis of heterocyclic compounds and their derivatives.
Utilization of Volga basin shales rich in sulfur in producing both power and chemicals may meet the needs for heterocyclic compounds not only in Russia but also in developed European countries.
As commonly assumed, this may be explained by the presence of the sulfur- and nitrogen-containing heterocyclic compounds that have a tendency to work as some kind of natural accelerators during the vulcanization reaction.
Many of the products containing the beta-ketoester pendant group are also candidates for further reactions with compounds such as hydroxylamine or hydrazines to give mixed heterocyclic compounds.
Smoky odors were caused by phenols; spicy, synthetic and floral odors by terpenes; and meaty, roasted odors by sulfur-containing heterocyclic compounds.
His publications dealt with topics in the fields of alkaloids, terpenes, steroids, amino-acids and peptides, carbohydrates, heterocyclic compounds, stereochemistry, conformational analysis, molecular volumes, ion mobilities, paper electrophoresis, dipole moments, electrostatic effects, acidity functions, acid-catalyzed reactions, solvent effects, and graph theory.
Tenders are invited for : lactones, neog, heterocyclic compounds only hetero-atom (s) of nitrogen with the structure noncondensable pirazynove ring, pyrimidine ring or ring piperazolne phenothiazine ring system not further condensation; hydantoin and its derivatives; sulphonamides (narcotic and psychotropic drugs)
The prompted the author to use 2,6-bis(3,4-dimethoxybenzylidene) cyclohexanone (1) as key intermediate in the synthesis of series of heterocyclic compounds.
On the other hand, it is well known that a number of heterocyclic compounds containing pyrazoline-5-one and thiazole moieties exhibit a wide variety of biological activities.