Name: naming benzene derivatives with one group
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nomenclature-of-aromatic-compounds-with-a-single-substituent

Nomenclature of Aromatic Compounds with a Single Substituent

Selon la nomenclature de l'UICPA, les dérivés monosubstitués du benzène sont nommés en préfixant le nom du substituant au benzène parent.
L’UICPA a également accepté des noms communs pour les dérivés simples de benzène monosubstitués. Par exemple, le toluène pour le méthylbenzène et le phénol pour l’hydroxybenzène.
Le benzène et ses dérivés substitués aux alkyles sont souvent appelés arènes. Ils sont nommés en fonction de la taille du groupe alkyle.
Si le groupe alkyle a six atomes de carbone ou moins, l’arène est appelée benzène substitué par un alkyle.
À l’inverse, lorsque le groupe alkyle a plus de six carbones ou est constitué d’autres groupes fonctionnels, le cycle benzénique est traité comme un substituant. Et l’arène est appelée un composé substitué par le phényle.
Le nom phényle, abrégé en Ph–, représente le groupe C6H5 du benzène en tant que substituant, comme dans le 2-phénylheptane.
De même, le benzyle, abrégé en Bn–, représente le groupe phénylméthyle en tant que substituant, comme dans le chlorure de benzyle.
L’aryle, abrégé en Ar–, est le substituant dérivé d’une arène après l’élimination d’un atome d’hydrogène du cycle aromatique.

nomenclature des composés aromatiques à un seul substituant

Le benzène est l’hydrocarbure aromatique ou arène le plus simple. Les noms IUPAC des dérivés simples du benzène monosubstitués sont dérivés en ajoutant le nom du substituant comme préfixe au benzene parent. Par exemple, l'halobenzène, où l'halogène pourrait être un fluoro (F), un chloro (Cl), un bromo (Br) et un iodo (I).

<img alt="Figure1" src="/files/ftp_upload/12449/12449_PT_Figure_1.svg" style="text-align: center; height: 100px;">

La dénomination des composés aromatiques dépend également de la longueur de la chaîne du groupe alkyle attaché au cycle benzénique. Si la chaîne alkyle comporte six carbones ou moins, le composé est appelé benzène alkyl-substitué. Par exemple, le propylbenzène, où le groupe alkyle a trois carbones.

<img alt="Figure2" src="/files/ftp_upload/12449/12449_PT_Figure_2.svg" style="text-align: center; height: 125px;">

Cependant, si la chaîne alkyle comporte plus de six carbones ou contient d’autres groupes fonctionnels préférentiels, le composé est appelé dérivé phényl-substitué. Le substituant obtenu à partir du benzène est appelé phényle (Ph-), tandis que celui dérivé du toluène est appelé groupes benzyle (Bn-). Par exemple, le 1-phénylheptane, dont la chaîne alkyle comporte sept carbones,

<img alt="Figure3" src="/files/ftp_upload/12449/12449_PT_Figure_3.svg" style="text-align: center; height: 120px;">

1-phényl-1-pentanone à fonction cétone,

<img alt="Figure4" src="/files/ftp_upload/12449/12449_PT_Figure_4.svg" style="text-align: center; height: 100px;">

éther diphénylique, où le groupe fonctionnel clé est l'éther,

<img alt="Figure5" src="/files/ftp_upload/12449/12449_PT_Figure_5.svg" style="text-align: center; height: 80px;">

et le bromure de benzyle dérivé du toluène.

<img alt="Figure6" src="/files/ftp_upload/12449/12449_PT_Figure_6.svg" style="text-align: center; height: 100px;">

En général, les substituants dérivés des arènes par perte d'hydrogène sont appelés aryles. Certains des dérivés simples du benzène monosubstitués ont acquis des noms communs acceptés par la nomenclature IUPAC. Par exemple, le vinylbenzène est le styrène et l'isopropylbenzène est le cumène. Le benzaldéhyde et l'acide benzoïque sont d'autres exemples.

<img alt="Figure7" src="/files/ftp_upload/12449/12449_PT_Figure_7.svg" style="text-align: center; height: 120px;">

Nomenclature des composés aromatiques à un seul substituant

Le benzène est l’hydrocarbure aromatique le plus simple ou arène. Les noms IUPAC des dérivés simples de benzène monosubstitués sont obtenus en ajoutant le ...

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Aromatic Compounds

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KEY TERMS AND CONCEPTS

TERMES ET CONCEPTS CLÉS

naming benzene derivatives with one group

Benzene derivatives with one substituent are named by attaching the substituent name to benzene. Benzene is the simplest aromatic hydrocarbon, also called an arene. For simple monosubstituted benzene compounds, IUPAC naming uses the group name as a prefix.

Halogen-substituted benzene compounds follow this pattern. The halogen prefix can be fluoro, chloro, bromo, or iodo. When an alkyl group is attached to the benzene ring, the name depends on the chain length of that group.

If the alkyl chain has six or fewer carbons, the compound is named as an alkyl-substituted benzene. Propylbenzene is one example, and its alkyl group has three carbons. If the alkyl chain has more than six carbons, or if another preferred functional group is present, the compound is named as a phenyl-substituted derivative.

The benzene-derived substituent is called phenyl, written as Ph-. The group derived from toluene is called benzyl, written as Bn-. Examples include 1-phenylheptane, 1-phenyl-1-pentanone, diphenyl ether, and benzyl bromide. In general, substituents formed from arenes by loss of hydrogen are called aryl groups. Some simple monosubstituted benzene derivatives also have common names accepted by IUPAC, including styrene for vinylbenzene, cumene for isopropylbenzene, benzaldehyde, and benzoic acid.

Naming Benzene Derivatives with One Group

naming-benzene-derivatives-with-one-group

aromatic compounds: overview

Aromatic Compounds in Plants and Fuels

Aromatic compounds are linked to both pleasant smells and important chemical structures. The word aromatic first came from fragrant natural sources such as fresh flowers and spices. Early organic chemists isolated benzene derivatives from oils of plants, including vanillin from vanilla, methyl salicylate from wintergreen, and cinnamaldehyde from cinnamon. The history of benzene also helped shape the idea of aromatic compounds. In 1825, Faraday isolated benzene from compressed illuminating gas,...

nomenclature of aromatic compounds with a single substituent

Benzene derivatives with one substituent are named by attaching the substituent name to benzene. Benzene is the simplest aromatic hydrocarbon, also called an arene. For simple monosubstituted benzene compounds, IUPAC naming uses the group name as a prefix. Halogen-substituted benzene compounds follow this pattern. The halogen prefix can be fluoro, chloro, bromo, or iodo. When an alkyl group is attached to the benzene ring, the name depends on the chain length of that group. If the alkyl chain...

nomenclature of aromatic compounds with multiple substituents

nomenclature-of-aromatic-compounds-with-multiple-substituents

Naming Benzene Rings with Multiple Groups

Naming benzene rings with multiple groups depends on how many substituents are attached. For benzene derivatives with two groups, three constitutional isomers are possible. The position of each group is described with IUPAC naming rules. For disubstituted benzene compounds, the relative positions can be shown with ortho, meta, and para. These terms are also written as o, m, and p. They can also be written with numbers, such as 1,2- for ortho, 1,3- for meta, and 1,4- for para. Dimethyl benzene,...

structure of benzene: kekul&eacute; model

Kekule’s Benzene Model and Its Limits

Kekule’s benzene model describes benzene as a six-carbon ring with alternating pi bonds. August Kekule proposed this structure in 1865 from the formula C6H6, the idea that all benzene hydrogens are equivalent, and the rule that each carbon has four bonds because of tetravalency. In this model, each carbon is attached to one hydrogen atom. It also predicts two isomers for 1,2-disubstituted benzene derivatives. In one form, the substituted carbons are linked by a double bond, and in the other...

structure of benzene: molecular orbital model

structure-of-benzene-molecular-orbital-model

Benzene π Orbitals and Electron Delocalization

Benzene has a planar ring structure with delocalized π electrons. Its six carbon atoms form a regular hexagon, and each carbon is sp2 hybridized. The C–C–C and H–C–C bond angles are 120°, which matches the flat shape of the ring. Each carbon is bonded to three other atoms. The C–H bond length is 109 pm, and the C–C bond length is 139 pm. That C–C distance is midway between the single bond length of sp3 hybridized carbons, 154 pm, and the sp2 value, 133 pm. Beneath and above the ring plane,...

criteria for aromaticity and the h&uuml;ckel 4n + 2 rule

criteria-for-aromaticity-and-the-hckel-4n-2-rule

H&uuml;ckel Rule and Aromatic Ring Criteria

Aromatic rings follow H&amp;uuml;ckel’s rule, also called the 4n + 2 rule. This rule helps identify which unsaturated cyclic compounds are aromatic and why some ring systems are unstable instead. Benzene is the classic example, while cyclobutadiene and cyclooctatetraene show different behavior and are not aromatic. Eric H&amp;uuml;ckel, a German chemical physicist, first described the structural features needed for aromaticity. An aromatic compound must be cyclic, planar, and continuously...

h&uuml;ckel's rule diagram of &pi; mos: frost circle

Frost Circle for Pi Orbital Energies

The Frost circle is a graphical method for showing the relative energies of pi molecular orbitals in planar, fully conjugated, monocyclic compounds. It is also called the inscribed polygon method. A. A. Frost and Boris Musulin first described this method in 1953. To build a Frost circle, draw a polygon with the same number of edges as the number of carbons in the cyclic system. Place one vertex pointing downward. Then draw a circle around the polygon so that every vertex touches the circle.

frost circles for different conjugated systems

frost-circles-for-different-conjugated-systems

Using Frost Circles to Test Aromaticity

Frost circles help test whether a cyclic compound is aromatic by using the inscribed polygon method and Hückel’s 4n + 2 rule. A compound is stable and aromatic when every bonding molecular orbital (MO) is completely filled with a pair of electrons. If electrons occupy non-bonding or antibonding orbitals, the compound is unstable and not aromatic. Frost circle diagrams for cycloalkenes with 4 to 8 carbons show a clear pattern. The number of bonding MOs is always odd. The electrons needed to...

aromatic hydrocarbon anions: structural overview

aromatic-hydrocarbon-anions-structural-overview

Cyclopentadienyl Anion and Aromaticity

Cyclopentadiene is a neutral hydrocarbon that is not aromatic. It contains an odd number of carbon atoms and one CH2 group in the ring. With only 4 pi electrons, it does not follow the 4n + 2 pi electron rule. The CH2 carbon is sp3 hybridized, so it has no vacant p orbital to keep p orbitals overlapped around the ring. That break in overlap stops pi electrons from spreading across the entire ring. As a result, cyclopentadiene does not meet the usual aromaticity criteria. If one hydrogen is...

aromatic hydrocarbon cations: structural overview

aromatic-hydrocarbon-cations-structural-overview

Cycloheptatrienyl Cation and Aromaticity

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon with seven carbon atoms. One carbon in the ring is sp3 hybridized, which breaks the continuous overlap of p orbitals. Even though the ring has three double bonds and 6 π electrons, cycloheptatriene is not aromatic because the p orbitals do not form one uninterrupted loop. Removing one hydrogen from the CH2 group changes the ring. If that hydrogen is removed with both, one, or no electrons, the products are the cycloheptatrienyl...

five-membered heterocyclic aromatic compounds: overview

five-membered-heterocyclic-aromatic-compounds-overview

Five-Membered Aromatic Rings with Heteroatoms

Five-membered aromatic rings with heteroatoms are cyclic compounds that contain one or more atoms other than carbon in the ring. They are aromatic and can have either five or six atoms in the ring. Common examples include pyrrole, furan, thiophene, and imidazole. These rings differ by the heteroatom present. Pyrrole has one nitrogen atom with one lone pair of electrons. Furan has one oxygen atom, and thiophene has one sulfur atom. Both furan and thiophene have two lone pairs of electrons.

nmr spectroscopy of aromatic compounds

Aromatic Ring Shifts in NMR Spectra

Aromatic ring shifts in NMR spectra help identify aromatic compounds using proton NMR and carbon-13 NMR. Aromatic hydrogens are often strongly deshielded by the aromatic ring current, so they usually appear in the 6.5–8.0 ppm range in proton NMR. In benzene, the hydrogens directly bonded to the ring absorb at 7.3 ppm. Larger aromatic rings can place hydrogens outside the usual range. In [18]annulene, the 12 outer hydrogens are highly deshielded by the ring current and absorb downfield at 9.3...

key terms and concepts

Learn how benzene derivatives with one substituent are named, including halobenzene, alkylbenzene, phenyl, benzyl, and common IUPAC names.

Naming Benzene Derivatives with One Group | JoVE K12

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Naming Benzene Derivatives with One Group

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