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Halogenation of Alkenes

Halogenation of Alkenes

Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.

Alkyl Halides

Alkyl Halides

Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...

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.
Removing one hydrogen from the intervening CH2 group with both...

Prochirality

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...

Formation of Halohydrin from Alkenes

Formation of Halohydrin from Alkenes

An alkene, such as propene, reacts with bromine in the presence of water to yield a halohydrin. Halohydrins contain a halogen and a hydroxyl group attached to adjacent carbons. When the halogen is bromine, it is called a bromohydrin, while a chlorohydrin has chlorine as the halogen.

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.

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3-(2-Methyl-amino-1,3-thia-zol-4-yl)-2H-chromen-2-one.

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Summary

This study details the crystal structure of a novel compound, C(13)H(10)N(2)O(2)S. Molecular interactions like hydrogen bonds and pi-pi stacking stabilize its 2D network crystal structure.

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Area of Science:

Crystal engineering
Organic chemistry
Materials science

Background:

Understanding molecular interactions is crucial for designing new materials.
Chromene and thiazole derivatives exhibit diverse biological and material properties.
Detailed structural analysis provides insights into intermolecular forces.

Purpose of the Study:

To elucidate the crystal structure of the title compound C(13)H(10)N(2)O(2)S.
To investigate the intermolecular interactions governing the crystal packing.
To understand the role of hydrogen bonding and pi-pi interactions in stabilizing the structure.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
Analysis of bond lengths, bond angles, and dihedral angles provided geometric information.
Intermolecular interactions, including hydrogen bonds and pi-pi stacking, were identified and quantified.

Main Results:

The compound C(13)H(10)N(2)O(2)S features a 2H-chromene ring system and a thiazole ring with a dihedral angle of 3.47°.
N-H⋯N and C-H⋯O hydrogen bonds link molecules into two-dimensional networks parallel to the bc plane.
C-H⋯π and π-π interactions (centroid-centroid separation of 3.6796 Å) further stabilize the crystal.

Conclusions:

The crystal structure is stabilized by a combination of hydrogen bonding and π-π interactions.
The planar nature of the ring systems and their specific arrangement contribute to the observed network structure.
This structural insight is valuable for the rational design of organic materials with tailored properties.