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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).

Radical Substitution: Allylic Bromination

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In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.

NMR Spectroscopy of Benzene Derivatives

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Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling...

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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...

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2,6-Bis(bromo-meth-yl)pyridine.

Olesea Cuzan¹, Tatiana Straistari¹, Constantin Turta¹

¹Institute of Chemistry of the Academy of Sciences of Moldova, 3 Academiei Street, Chisinau MD-2028, Republic of Moldova.

Acta Crystallographica. Section E, Structure Reports Online

|February 15, 2014

Summary

This study details the crystal structure of a pyridine derivative (C7H7Br2N). Molecules stack along the c axis, featuring perpendicular bromo-methyl groups and close bromine-bromine contacts.

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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

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Area of Science:

Crystallography
Organic Chemistry
Supramolecular Chemistry

Background:

Understanding molecular packing is crucial for predicting material properties.
Pyridine derivatives are common scaffolds in pharmaceuticals and materials science.
Halogen bonding and intermolecular interactions influence crystal structures.

Purpose of the Study:

To elucidate the crystal structure of the novel molecule C7H7Br2N.
To analyze the intermolecular interactions and packing motifs in the crystal lattice.
To investigate the role of bromine atoms in crystal assembly.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
Analysis of bond vectors, distances, and angles provided insights into molecular conformation.
Intermolecular contacts, including halogen bonds, were identified and quantified.

Main Results:

The molecule C7H7Br2N exhibits bromo-methyl groups oriented nearly perpendicular to the pyridine ring plane.
Molecules form stacks along the c axis with a centroid-centroid distance of 3.778 Å between aromatic rings.
A short bromine-bromine contact (3.6025 Å) was observed between inversion-related molecules.

Conclusions:

The crystal structure is characterized by specific molecular orientation and intermolecular interactions.
The observed packing suggests potential for directional interactions, influencing bulk properties.
This structural data provides a foundation for further studies on related pyridine derivatives and halogen bonding.