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Updated: May 15, 2026

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
Published on: August 22, 2018
2-Cyano-N'-[1-(pyridin-2-yl)ethyl-idene]acetohydrazide
Xiao-Yi Zhang1, Xiao-Lin Han, Zhi-Bin Qian
1School of Pharmacy, Xinxiang Medical University, Xinxiang Henan 453003, People's Republic of China.
This study details the molecular structure of a novel pyridine derivative, C(10)H(10)N(4)O. The research highlights the specific dihedral angle and hydrogen bonding interactions within its crystal structure.
Area of Science:
- Crystallography
- Organic Chemistry
- Molecular Structure
Background:
- Pyridine derivatives are important in medicinal chemistry and materials science.
- Understanding molecular conformation and intermolecular interactions is crucial for predicting compound properties.
Purpose of the Study:
- To elucidate the crystal structure and molecular geometry of the title compound, C(10)H(10)N(4)O.
- To investigate the intermolecular interactions, specifically hydrogen bonding, in the solid state.
Main Methods:
- Single-crystal X-ray diffraction was employed to determine the three-dimensional structure.
- Analysis of bond lengths, bond angles, and dihedral angles provided detailed geometric information.
- Hydrogen bonding networks were identified and characterized.
Main Results:
- The dihedral angle between the pyridine ring and the -C=O(CH(2))CN group was determined to be 24.08(12)°.
- Inversion dimers were observed in the crystal lattice.
- Pairs of N-H⋯N hydrogen bonds were identified, forming R(2)(2)(8) loops.
Conclusions:
- The study provides a precise description of the molecular conformation and crystal packing of C(10)H(10)N(4)O.
- The identified hydrogen bonding pattern influences the overall crystal structure and stability.
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Nomenclature of Carboxylic Acid Derivatives: Amides and Nitriles
The IUPAC and common names of amides are derived from the parent carboxylic acid, by replacing the suffix “oic acid” and “ic acid,” respectively, with “amide.” In the following example, the IUPAC name ethanamide is derived from ethanoic acid, and the common name, acetamide, is obtained from acetic acid.
Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration
Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.

