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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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Heterocyclic Surgery for Isotopic Labeling.

Joel M Smith1

  • 1Florida State University, 95 Chieftan Way, Tallahassee, FL 32308, USA.

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|March 9, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a method for isotopic labeling of heteroarenes using the Zincke reaction. This technique enables the synthesis of isotopologues for applications in medicine, materials, and organic chemistry.

Keywords:
ANRORCZinckeazinedearomatizationisotopelabelingpyridine

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Area of Science:

  • Organic chemistry
  • Biomedical science
  • Materials chemistry

Background:

  • Isotopic labeling is crucial for various scientific fields.
  • Heteroarenes are common structural motifs in pharmaceuticals and natural products.

Purpose of the Study:

  • To present a novel method for isotopic labeling of heteroarenes.
  • To demonstrate the utility of the Zincke reaction for synthesizing isotopologues.

Main Methods:

  • Utilizing the Zincke reaction and its variants for nitrogen replacement in azines.
  • Applying dearomative retrosynthetic analysis for accessing saturated azacycle isotopologues.

Main Results:

  • Successful single-atom nitrogen replacement in various azines to yield desired isotopologues.
  • Demonstrated early-stage synthetic leverage for diversity-oriented labeling of complex molecules.

Conclusions:

  • The developed isotopic labeling method offers a versatile approach for synthesizing heteroarene isotopologues.
  • This chemistry is valuable for applications in biomedical science, materials chemistry, and fundamental organic chemistry.