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Related Experiment Videos

Dimerisation of levonorgestrel in solid state ultraviolet light irradiation

J Reisch1, J Zappel, A R Rao

  • 1Institut für Pharmazeutische Chemie der Westfälischen Wilhelms-Universität, Münster, Germany.

Pharmaceutica Acta Helvetiae
|October 1, 1994
PubMed
Summary

UV-irradiation of crystalline levonorgestrel (1) produced a dimer (3) as the main photoproduct. X-ray crystallography of levonorgestrel (1) suggested this photochemical dimerization was possible.

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Area of Science:

  • Photochemistry
  • Organic Chemistry
  • Crystallography

Background:

  • Levonorgestrel (1) is a synthetic progestogen used in hormonal contraceptives.
  • Understanding its photochemical behavior is crucial for stability and formulation.
  • Previous studies hinted at potential light-induced reactions.

Purpose of the Study:

  • To investigate the photochemical reactions of levonorgestrel (1) under UV irradiation.
  • To identify and characterize the primary photoproducts formed.
  • To correlate crystal structure with observed photochemical behavior.

Main Methods:

  • UV-irradiation of crystalline levonorgestrel (1) under a nitrogen atmosphere.
  • Characterization of the photoproduct using spectral and analytical data.

Related Experiment Videos

  • Single crystal X-ray crystallographic analysis of levonorgestrel (1).

    • Main Results:

    • The principal photoproduct identified was the levonorgestrel dimer (3).
    • The dimer's structure was confirmed through comprehensive spectral and analytical data.
    • X-ray crystallographic data of levonorgestrel (1) supported the feasibility of photochemical dimerization.

    Conclusions:

    • UV irradiation of levonorgestrel (1) in the solid state leads to dimerization.
    • The crystalline structure of levonorgestrel (1) predisposes it to photochemical dimerization.
    • This finding has implications for the storage and handling of levonorgestrel-containing products.