Related Experiment Video
Updated: Jun 1, 2026

07:06
Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid
Published on: November 15, 2017
2,5-Diphenyl-penta-2,4-dienenitrile
Summary
The crystal structure of C(17)H(13)N reveals a dihedral angle of 17.6° between its phenyl rings. Intermolecular interactions include C-H⋯N hydrogen bonding and C-H⋯π interactions, offering insights into molecular packing.
Area of Science:
- Crystallography
- Organic Chemistry
- Supramolecular Chemistry
Background:
- Understanding the three-dimensional arrangement of molecules in the solid state is crucial for predicting material properties.
- Intermolecular forces, such as hydrogen bonds and π-π stacking, significantly influence crystal packing and molecular behavior.
- The specific compound C(17)H(13)N presents an interesting case for studying these interactions due to its aromatic nature.
Purpose of the Study:
- To determine the precise crystal structure of the title compound, C(17)H(13)N.
- To identify and characterize the intermolecular interactions present in the crystal lattice.
- To analyze the spatial arrangement and conformational preferences of the phenyl rings within the crystal structure.
Main Methods:
- Single-crystal X-ray diffraction was employed to obtain the necessary crystallographic data.
- The crystal structure was solved and refined using standard crystallographic software.
- Analysis of the crystal structure involved identifying hydrogen bonds and other non-covalent interactions using geometric criteria.
Main Results:
- The crystal structure of C(17)H(13)N was successfully determined.
- A notable dihedral angle of 17.6(1)° was measured between the two phenyl rings, indicating a non-planar conformation.
- Intermolecular C-H⋯N hydrogen bonds and C-H⋯π interactions involving a phenyl ring were identified as key stabilizing forces in the crystal.
Conclusions:
- The crystal structure of C(17)H(13)N is characterized by a significant twist between its phenyl rings.
- These phenyl rings are further stabilized by intermolecular C-H⋯N hydrogen bonds and C-H⋯π interactions.
- The findings provide valuable data on the solid-state behavior and intermolecular forces governing this organic compound.
More Related Videos
Related Concept Videos
Structure of Conjugated Dienes
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...
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...
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
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.
Diels–Alder Reaction: Characteristics of Dienes
The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
Stability of Conjugated Dienes
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
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.
meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H
All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for the...

