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¹H NMR: Complex Splitting

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.

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.

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO₂ Overview

Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...

2° Amines to N-Nitrosamines: Reaction with NaNO2

2° Amines to N-Nitrosamines: Reaction with NaNO₂

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...

Newman Projections

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.

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N-(2,6-Dibromophenyl)formamide.

Bernard Omondi¹, Demetrius C Levendis, Marcus Layh

¹Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, PO Wits, 2050 Johannesburg, South Africa. bernardowaga@gmail.com

Acta Crystallographica. Section C, Crystal Structure Communications

|April 7, 2009

Summary

This summary is machine-generated.

The crystal structure of C(7)H(5)Br(2)NO reveals molecules forming chains via N-H...O hydrogen bonds. Aryl rings stack parallel, with Br...O and Br...Br interactions further stabilizing the crystal packing.

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Area of Science:

Crystallography
Chemical Physics
Materials Science

Background:

Understanding intermolecular forces is crucial for predicting crystal structures and material properties.
The specific interactions governing the packing of organic molecules dictate their solid-state behavior.

Purpose of the Study:

To elucidate the crystal structure of the title compound, C(7)H(5)Br(2)NO.
To identify and characterize the intermolecular interactions responsible for the observed molecular packing.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the three-dimensional arrangement of atoms.
Analysis of the crystal structure involved identifying hydrogen bonds and other non-covalent interactions.

Main Results:

The crystal structure is characterized by chains formed through N-H...O hydrogen bonds along the crystallographic a direction.
Aryl rings are observed to stack parallel to each other within these chains.
Br...O and Br...Br intermolecular interactions were identified as significant contributors to the overall crystal packing.

Conclusions:

The crystal structure of C(7)H(5)Br(2)NO is primarily stabilized by a combination of N-H...O hydrogen bonds and halogen bonding (Br...O, Br...Br).
The parallel stacking of aryl rings contributes to the one-dimensional chain formation.
These findings provide insights into the supramolecular assembly of halogenated organic compounds.