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Aromatic Hydrocarbon Cations: Structural Overview

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Structure of Conjugated Dienes

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Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...

Nomenclature of Alkynes

Nomenclature of Alkynes

Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.

Basicity of Heterocyclic Aromatic Amines

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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).

Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene

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Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.

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2-(Pyrene-1-yl)-1,3-dithiane.

Hoong-Kun Fun, Samuel Robinson Jebas, Annada C Maity

Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

This summary is machine-generated.

This study reveals the molecular structure of a novel pyrene-dithiane compound. Key findings include its planar pyrene ring, chair-conformed dithiane ring, and stabilizing C-H⋯π interactions.

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Area of Science:

Crystallography
Organic Chemistry
Supramolecular Chemistry

Background:

Pyrene derivatives are significant in materials science.
Dithiane rings are important heterocyclic scaffolds.
Understanding molecular interactions is crucial for designing new materials.

Purpose of the Study:

To elucidate the crystal structure of a specific pyrene-dithiane compound.
To analyze the conformational preferences of the pyrene and dithiane rings.
To investigate the intermolecular and intramolecular interactions governing crystal packing.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the three-dimensional structure.
Analysis of bond lengths, bond angles, and torsion angles.
Identification and analysis of non-covalent interactions, including C-H⋯π and C-H⋯S bonds.

Main Results:

The pyrene moiety exhibits planarity with minimal deviation.
The dithiane ring adopts a stable chair conformation.
Crystal packing is significantly influenced by C-H⋯π interactions.
An intramolecular C-H⋯S hydrogen bond forms a five-membered S(5) ring motif.

Conclusions:

The study provides detailed structural insights into the pyrene-dithiane system.
The observed conformational preferences and stabilizing interactions are key to the compound's solid-state structure.
This research contributes to the understanding of structure-property relationships in sulfur-containing polycyclic aromatic hydrocarbons.