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Updated: Jun 1, 2026

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Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions
Published on: July 28, 2022
1-Tetra-decyl-indoline-2,3-dione.
Summary
This study analyzes N-alkyl isatin, revealing a planar isatin core. The long tetra-decyl chain adopts a specific anti-periplanar conformation, offering insights into molecular structure.
Area of Science:
- Organic Chemistry
- Crystallography
- Molecular Structure Analysis
Background:
- Isatin derivatives are significant in medicinal chemistry and materials science.
- Understanding the conformational preferences of N-alkyl substituents is crucial for predicting molecular properties and interactions.
Purpose of the Study:
- To elucidate the three-dimensional molecular structure of a specific N-alkyl isatin derivative.
- To investigate the conformational characteristics of the isatin core and its N-alkyl chain.
Main Methods:
- Single-crystal X-ray diffraction analysis was performed on N-alkyl isatin (C(22)H(33)NO(2)).
- Analysis of atomic coordinates and bond parameters to determine molecular geometry.
Main Results:
- The isatin moiety within the N-alkyl isatin molecule was found to be planar, with a root-mean-square deviation of 0.03 Å.
- The tetra-decyl substituent exhibited a fully extended conformation, with all torsion angles adopting an anti-periplanar arrangement.
Conclusions:
- The planar nature of the isatin core is maintained in this N-alkyl derivative.
- The extended anti-periplanar conformation of the long alkyl chain suggests specific packing or intermolecular interactions in the solid state.
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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...
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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.
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Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
In cyclohexane, the substituents can occupy different positions generating distinct isomers.
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Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
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