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Organic Chemistry

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Organic Chemistry

Alcohol

An organic compound containing a hydroxyl group bonded to a saturated carbon atom.

R–OH Dimensionless
Organic Chemistry

Aldehyde

A compound containing a carbonyl group bonded to at least one hydrogen atom, so it lies at the end of a chain.

R–CHO Dimensionless
Organic Chemistry

Aldol Condensation

The base-catalysed reaction of two carbonyl compounds to give a beta-hydroxy carbonyl, which often dehydrates to an enone.

2RCH₂CHO → RCH₂CH(OH)CHRCHO Dimensionless
Organic Chemistry

Alkane

A saturated hydrocarbon containing only single carbon–carbon bonds.

CₙH₂ₙ₊₂ Dimensionless
Organic Chemistry

Alkene

An unsaturated hydrocarbon containing at least one carbon–carbon double bond.

CₙH₂ₙ Dimensionless
Organic Chemistry

Alkyne

An unsaturated hydrocarbon containing at least one carbon–carbon triple bond.

CₙH₂ₙ₋₂ Dimensionless
Organic Chemistry

Amide

A compound in which a carbonyl group is bonded directly to nitrogen.

R–CO–NH₂ Dimensionless
Organic Chemistry

Amine

A compound derived from ammonia by replacing one or more hydrogens with alkyl or aryl groups.

R–NH₂, R₂NH, R₃N Dimensionless
Organic Chemistry

Anti-Markovnikov Addition

Addition in which the hydrogen attaches to the carbon bearing fewer hydrogens, reversing the normal regiochemistry.

Dimensionless
Organic Chemistry

Arene

An aromatic hydrocarbon containing one or more benzene rings.

CₙH₂ₙ₋₆ Dimensionless
Organic Chemistry

Aromaticity

The special stability of planar cyclic molecules with a continuous, fully conjugated system of delocalised pi electrons.

planar, cyclic, conjugated, 4n+2 π kJ/mol
Organic Chemistry

Benzene

The simplest aromatic hydrocarbon, a planar regular hexagon of six sp² carbons with a delocalised pi cloud.

C₆H₆ Dimensionless
Organic Chemistry

Cannizzaro Reaction

The disproportionation of an aldehyde with no alpha hydrogen under concentrated alkali into an alcohol and a carboxylate.

2RCHO + OH⁻ → RCH₂OH + RCOO⁻ Dimensionless
Organic Chemistry

Carbanion

An organic ion in which a carbon atom bears a negative charge and a lone pair.

R₃C⁻ Dimensionless
Organic Chemistry

Carbocation

An organic ion in which a carbon atom bears a positive charge and only six valence electrons.

R₃C⁺ Dimensionless
Organic Chemistry

Carboxylic Acid

A compound containing a carboxyl group, in which a carbonyl and a hydroxyl group share the same carbon.

R–COOH Dimensionless
Organic Chemistry

Chain Isomerism

Structural isomerism arising from different arrangements of the carbon skeleton.

Dimensionless
Organic Chemistry

Chirality

The property of a molecule that makes it non-superimposable on its mirror image.

Dimensionless
Organic Chemistry

Conformational Isomerism

The different spatial arrangements a molecule can adopt through rotation about single bonds.

kJ/mol
Organic Chemistry

Diastereomer

A stereoisomer that is not a mirror image of the compound with which it is compared.

Dimensionless
Organic Chemistry

E1 Reaction

A two-step elimination proceeding through a carbocation, which then loses a proton to form an alkene.

rate = k[substrate] s⁻¹
Organic Chemistry

E2 Reaction

A single-step elimination in which a base removes a proton as the leaving group departs, forming a double bond.

rate = k[substrate][base] L/(mol·s)
Organic Chemistry

Electrophile

An electron-deficient species that seeks and accepts a pair of electrons from an electron-rich centre.

E⁺ Dimensionless
Organic Chemistry

Electrophilic Addition

A reaction in which an electrophile adds across a carbon–carbon multiple bond, converting a pi bond into two sigma bonds.

C=C + E–Nu → C(E)–C(Nu) Dimensionless