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Updated: May 3, 2026

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
Published on: August 22, 2018
4-Methyl-N-(4-nitro-benzyl-idene)piperazin-1-amine
Channappa N Kavitha1, Jerry P Jasinski2, Brian J Anderson2
1Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, India.
This study details the molecular structure of a nitro-substituted compound, revealing a distorted piperazine ring and specific twists between aromatic and aliphatic groups. Weak hydrogen bonds facilitate molecular dimerization in the crystal lattice.
Area of Science:
- Organic Chemistry
- Crystallography
- Molecular Structure
Background:
- Piperazine derivatives are important in medicinal chemistry.
- Nitroaromatic compounds exhibit diverse chemical properties.
- Understanding molecular conformation is key to predicting chemical behavior.
Purpose of the Study:
- To elucidate the three-dimensional molecular structure of the title compound (C12H16N4O2).
- To analyze the conformational characteristics of the piperazine ring and the orientation of the nitro group.
- To investigate intermolecular interactions in the crystalline state.
Main Methods:
- Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
- Conformational analysis of the piperazine ring was performed.
- Intermolecular interactions, specifically C-H⋯O hydrogen bonds, were identified.
Main Results:
- The piperazine ring adopts a slightly distorted chair conformation.
- The nitro group is twisted by 8.0° relative to the benzene ring.
- A torsion angle of -176.24° was observed between the 2-nitro-benzyl and piperazine rings.
- Weak C-H⋯O interactions link molecules into dimers.
Conclusions:
- The study provides detailed structural insights into a specific nitro-substituted piperazine derivative.
- The observed conformation and intermolecular interactions offer a basis for understanding its solid-state properties.
- This structural data can inform future drug design and materials science applications involving similar compounds.
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