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IUPAC Nomenclature of Aldehydes

IUPAC Nomenclature of Aldehydes

Aldehydes are named based on the systematic nomenclature rules set by the IUPAC. For acyclic aldehydes, the longest carbon chain containing the aldehydic (–CHO) group is considered the parent chain. The aldehyde is named by replacing the last letter “e” in the hydrocarbon name with “al”. For instance, a simple, seven-carbon-membered acyclic aldehyde is called heptanal, derived from heptane. The carbon chain is numbered starting from the aldehydic carbon, although the aldehydic carbon’s locant...

IUPAC Nomenclature of Carboxylic Acids

IUPAC Nomenclature of Carboxylic Acids

IUPAC names of carboxylic acids are systematically derived following a few rules discussed below.
For acyclic saturated monocarboxylic acids, the longest hydrocarbon chain containing the –COOH carbon is identified as the parent chain. Then, the last -e of the parent hydrocarbon name is replaced with a suffix -oic acid.

Diazonium Group Substitution: –OH and –H

Diazonium Group Substitution: –OH and –H

Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.

Basicity of Heterocyclic Aromatic Amines

Basicity of Heterocyclic Aromatic Amines

Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).

Nomenclature of Aromatic Compounds with Multiple Substituents

Nomenclature of Aromatic Compounds with Multiple Substituents

When more than one substituent is present on the benzene ring, the IUPAC nomenclature depends on the number of substituents present.
For disubstituted benzene derivatives, with two groups attached to the benzene ring, three constitutional isomers are possible. For example, consider dimethyl benzene, often called xylene, where the second methyl group can be substituted at the second, third, or fourth carbon. The relative position of the substituents is represented by prefixes ortho, meta, or...

Nomenclature of Carboxylic Acid Derivatives: Acid Halides, Esters, and Acid Anhydrides

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Naming Acid Halides
The IUPAC and common names of acid halides are derived from the corresponding carboxylic acids, by changing “ic acid” to “yl halide.” For example, as shown below, the IUPAC name ethanoyl chloride is derived from ethanoic acid, and the common name, acetyl chloride, is obtained from acetic acid.

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4-(Imidazol-1-yl)benzoic acid.

Zheng Zheng¹, Wen-Qian Geng, Zhi-Chao Wu

¹Department of Chemistry, Anhui University, Hefei 230039, People's Republic of China, and Key Laboratory of Functional Inorganic Materials Chemistry, Hefei 230039, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online

|April 28, 2011

Summary

This study details the crystal structure of a molecule with formula C(10)H(8)N(2)O(2). It reveals specific dihedral angles and intermolecular hydrogen bonding that form linked molecular chains and sheets in the crystal lattice.

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Area of Science:

Crystallography
Molecular structure analysis

Background:

Understanding molecular arrangements in crystals is crucial for predicting material properties.
The specific molecule C(10)H(8)N(2)O(2) has potential applications requiring knowledge of its solid-state structure.

Purpose of the Study:

To elucidate the crystal structure of the molecule C(10)H(8)N(2)O(2).
To characterize the intermolecular interactions governing the crystal packing.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
Analysis of hydrogen bonding and other non-covalent interactions was performed.

Main Results:

The imidazole and benzene rings exhibit a dihedral angle of 14.5(1)°.
Intermolecular O-H⋯N hydrogen bonds create chains along the [01] direction.
Weak C-H⋯O interactions further link these chains into sheets parallel to the (102) plane.

Conclusions:

The crystal structure of C(10)H(8)N(2)O(2) is characterized by specific dihedral angles and extensive hydrogen bonding.
These interactions dictate a layered structure formed by linked molecular chains, providing insights into its solid-state behavior.