(organic chemistry) A polycyclic aromatic hydrocarbon containing an unsaturated five-membered ring ortho- and peri-fused to the 1- and 9- positions of naphthalene.

(obsolete, organic chemistry) pentene.

Alternative form of anisole [(organic chemistry) The aromatic ether methoxybenzene; it is used in perfumery and in organic synthesis; any derivative of this compound]

(organic chemistry) The heterocycle formally derived from quinolizine by replacing the nitrogen atom with one or arsenic

(organic chemistry) A particular spirolactam

(organic chemistry) A bicyclic heterocycle consisting of a benzene ring fused to that of isothiazole

A polycyclic aromatic hydrocarbon, the result of incomplete combustion of organic matter at high temperatures, found in grilled meats, tobacco smoke, etc.

(organic chemistry) A tricyclic heterocycle formed by the fusion of a benzene ring to a chromene

(organic chemistry) A bicyclic heterocycle consisting of a benzene ring fused to that of oxazine.

(organic chemistry) The compound cycloheptylcycloheptane

(organic chemistry) Any of several isomeric aromatic hydrocarbons formed from two naphthalene groups joined by a single bond.

(organic chemistry) Any of several isomeric phenols derived from biphenanthryl

(organic chemistry) A bisaryl oxime

(organic chemistry) crotonaldehyde

(organic chemistry) Any of a class of organic macrocycle containing a ring of phenol groups linked by a short bridge; they mimic some properties of enzymes, and have many other applications.

(organic chemistry) The bicyclic hydrocarbon 3,7,7-trimethylbicyclo[4.1.0]heptane

(chemistry) the most stable chemical conformation of a six-membered single bonded carbon ring such as cyclohexane

Alternative form of chrysene [(organic chemistry) A polycyclic aromatic hydrocarbon, 1,2-benzphenanthrene, containing four fused benzene rings]

(chemistry) an organometallic compound formed from cyclopentadiene (or a derivative) and a transition element or other metal

(organic chemistry) Describing a pyranose that has a cyclopentane ring

(organic chemistry) A macrocycle used in host-guest chemistry as a molecular host.

(organic chemistry) A bicyclic cycloalkane consisting of two fused cyclohexane rings; it is used as an industrial solvent

(organic chemistry) A dendritic adduct of fullerene

(organic chemistry) Any dinitrile derived from butane, but especially 1,2-dicyanobutane and 1,4-dicyanobutane

(organic chemistry) The unsaturated, tricyclic heterocycle formed by adding two hydrogen atoms to the pyrrole ring of a carbazole.

(organic chemistry) A five-membered, unsaturated heterocycle having four carbon atoms, one oxygen atom and one double bond; any derivative of this compound

(organic chemistry) A derivative of tetrahydrobiopterin

(organic chemistry) Any of several isomeric dimethyl derivatives of benzanthracene, but especially 7,12-dimethylbenzanthracene which is a carcinogenic polycyclic hydrocarbon used in medical research

(organic chemistry) An unsaturated, five-membered heterocycle containing two sulfur atoms, one nitrogen atom and two double bonds

(organic chemistry) A liquid aromatic compound used to prepare the anionic detergent dodecylbenzene sodium sulfonate.

A chemical compound, C₁₈H₂₅NO₅.

Initialism of divinylbenzene. [(organic chemistry) Any of three isomeric vinyl derivatives of benzene that are used to make copolymers with styrene]

(organic chemistry, especially in combination) Any ethyl derivative of benzothiazoline

(organic chemistry) The common name for the organic chemical compound ethene. The simplest alkene, a colorless gaseous (at room temperature and pressure) hydrocarbon with the chemical formula C₂H₄.

(chemistry) Any hydrocarbon consisting of a central carbon atom connected with single bonds to four other carbon atoms each of which is connected to two of the others by a chain of carbon atoms; any derivative of such a compound.

(organic chemistry) The sesquiterpene hydrocarbon 4, 10-dimethyl-7-isopropylidene-cyclodeca-4, 10-diene present in the essential oil of hops

(organic chemistry) A six-chlorine substituted cyclohexane, a polyhalogenated compound used in pesticides

(organic chemistry) An isotopically labelled form of benzene in which every hydrogen atom has been replaced by deuterium

(organic chemistry) Either of two isomeric ketones derived from indane.

(organic chemistry) An isomer of the sesquiterpene cedrane that is used in the fragrance industry

(organic chemistry) A flammable polycyclic hydrocarbon with the chemical formula C₉H₈, composed of a cyclohexadiene ring fused with a cyclopentadiene ring.

(chemistry) An α,β-unsaturated cyclic ketone, a colourless to yellowish liquid with a characteristic smell, used as a solvent and as an intermediate in organic synthesis.

(organic chemistry) A saturated, five-membered heterocycle containing three carbon atoms and a sulfur and nitrogen atom in the 1,2 positions; any derivative of this compound

(organic chemistry) Any of a group of tetracyclic alkaloids obtained from Lycopodium

(chemistry) any of a class of compounds having five-membered ring heterocycles (or their benzo derivatives) which possess a sextet of π-electrons in association with the atoms comprising the ring, but which cannot be represented by any one covalent or polar structure; typically the ring structure contains both positive and negative delocalised charges which cannot be associated with any one ring atom, and the negative charge can also be associated with a conjugated exocyclic atom (typically oxygen, sulfur, or nitrogen).

(organic chemistry) Any of three isomeric methyl derivatives of a butene

(organic chemistry) The sesquiterpene (1R,6S)-2,6,8,8-tetramethyltricyclo[5.2.2.0^(1,6)]undec-2-ene

(organic chemistry, in combination) A nitro derivative of a benzoyl radical

Alternative form of oil of mirbane [Nitrobenzene.]

(organic chemistry) A heterocycle composed of a cycloheptene ring in which one of the methylene (-CH₂-) groups has been replaced by an ether (-O-) group

(organic chemistry) Either of two isomeric aliphatic diketones (2,3-pentanedione, 2,4-pentanedione) derived from pentane

(dated, organic chemistry) pentyne

(organic chemistry) o-, m- or p-aminophenyl-ethyl ether

(organic chemistry) A keto-hydro derivative of phthalazine

(organic chemistry, especially in combination) A univalent radical derived from 1,3-benzodioxole.

(organic chemistry) a polycyclic hydrocarbon, C₆H₆, having the shape of a regular triangular prism; any derivative of this compound

A spiro compound.

(organic chemistry) Any of a class of unsaturated heterocyclic compounds containing a ring of five carbon atoms, an oxygen atom and two double bonds; especially the simplest one, C₅H₆O.

(organic chemistry) The saturated, bicyclic heterocycle 1-azabicyclo[2.2.2]octane; any of its derivatives

(organic chemistry) Any of a class of hydrocarbons consisting of spiro-linked cyclopropane units only, but with a common [n]membered ring in the middle; they are named n-rotanes depending on the size of the inner ring

(chemistry) Any of various compounds formally derived from a fullerene by breaking a carbon-carbon bond and adding two hydrogen atoms

(physics, chemistry) An organic compound, containing an unpaired electron spin, that can be bonded to a molecule under investigation so as to be analysed using electron spin resonance spectroscopy

(organic chemistry) Any of a class of bicyclic hydrocarbons in which a carbon atom has two single bonds in each of two rings; a form of spiro compound

(organic chemistry) An unsaturated spiran containing at least one double bond in one of the rings

Only used in spiro compound

(organic chemistry) Any polycyclic compound having a single atom (usually carbon) as the only common member of two rings.

(organic chemistry) Describing two rings that are joined, via a single atom, to form a spiro compound.

(organic chemistry, in combination) Any spiro compound derived from adamantane

Alternative form of spiro-annulated [(organic chemistry) Describing two rings that are joined, via a single atom, to form a spiro compound.]

(chemistry) The connecting atom in a spiro compound.

(organic chemistry) A spiro compound, one of whose rings is an azirine

(organic chemistry) Any spirocyclic compound

(organic chemistry) Having the geometry of a spiro compound

(chemistry) A divalent radical in which a cyclobutane ring is fused to another ring at a single carbon atom, the two rings being more-or-less at right angles to one another

(chemistry) A divalent radical in which a cycloheptane ring is fused to another ring at a single carbon atom, the two rings being more or less at right angles to one another.

(chemistry) A divalent radical in which a cyclononane ring is fused to another ring at a single carbon atom, the two rings being more or less at right angles to one another.

(chemistry) A divalent radical in which a cyclooctane ring is fused to another ring at a single carbon atom, the two rings being more or less at right angles to one another.

(chemistry) A divalent radical in which a cyclopentane ring is fused to another ring at a single carbon atom, the two rings being more-or-less at right angles to one another

(organic chemistry) A divalent radical in which a cyclopropane ring is fused to another ring at a single carbon atom, the two rings being more-or-less at right angles to one another

(organic chemistry) Synonym of spirocyclopropane

(organic chemistry) A spiro compound in which a carbon atom of an epoxide ring is the only common member of two rings

(organic chemistry, of two rings) fused so as to form a spiro compound

(organic chemistry) Any spiro compound that is a ketal.

(organic chemistry) A spiro compound formed from two oxindoles

(organic chemistry) The simplest triangulane hydrocarbon, C₅H₈, consisting of two spiro-linked cyclopropane rings

(organic chemistry) The polycyclic spiro compound derived from urea 1-(1-azabicyclo[2.2.2]octan-3-yl)-3-[3-(1H-indol-3-yl)-1-oxo-1-spiro[1,2-dihydroindene-3,4'-piperidine]-1'-ylpropan-2-yl]urea or any of a class of similar compounds having a piperidine ring attached in a spiro-manner

(organic chemistry) Any spiro compound in which one of the rings is a pyran

(organic chemistry) Synonym of rotane

(organic chemistry) Any spiran that has eleven carbon atoms

Any of a class of organic dyes derived from squaric acid.

A theoretical heterocyclic organic compound, a five-membered ring with the formula C₄H₄SbH.

(organic chemistry) A tricyclic aromatic hydrocarbon, C₆H₅-C₆H₄-C₆H₅, composed of three benzene rings in a row

(organic chemistry) Either of two isomers of the bicyclic ketone benzocyclohexanone containing a benzene ring fused with that of cyclohexanone; it is use in the synthesis of other compounds, especially the contraceptive 18-methyl norethisterone

(organic chemistry) The angular polyphene composed of a benzene ring fused to anthracene; isomeric with tetracene

(organic chemistry) Any compound having five rings linked spirocyclically via four carbon atoms

A chemical compound, C₁₈H₈S₄.

(organic chemistry) Any ketone derived from tetrazoline

(organic chemistry) Any spiro compound that has a sulfur atom adjacent to the bridgehead atom

(organic chemistry) A derivative of thiazolidine that has a carbonyl group between the sulfur and nitrogen atoms

(organic chemistry) A ketone derivative of thiophene obtained as a white crystalline substance, C₄H₃S)₂.CO, by the action of aluminium chloride and carbonyl chloride on thiophene.

(organic chemistry) An azafluoranthene in which one or more carbon atoms has been replaced by sulfur

(organic chemistry) An unsaturated six-membered heterocycle consisting of five carbon atoms. one sulfur atom and two double bonds

(organic chemistry) Either of two isomers of a bicyclic monoterpenoid ketone found in several aromatic plants.

(organic chemistry) Any of three isomeric aromatic heterocycles containing three carbon atoms, three nitrogen atoms and three double bonds

(organic chemistry) Any compound having four rings linked spirocyclically via three carbon atoms

(organic chemistry) any derivative of cycloheptatrienone

(organic chemistry) A tricyclic aromatic heterocycle composed of a pyridine ring fused with indole