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Weakly basic impurities in illicit amphetamine

A M van der Ark, A M Verweij, A Sinnema

    Journal of Forensic Sciences
    |October 1, 1978
    PubMed
    Summary
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    This study identified pyrimidine, pyridine, and pyridone impurities in illicit amphetamines made using the Leuckart synthesis. Advanced analytical techniques confirmed the presence and structure of these unexpected compounds.

    Area of Science:

    • Forensic Chemistry
    • Organic Chemistry
    • Analytical Chemistry

    Background:

    • Illicit amphetamine synthesis, particularly via the Leuckart reaction, can produce various byproducts.
    • Understanding these impurities is crucial for forensic analysis and drug profiling.

    Purpose of the Study:

    • To isolate and identify specific impurities present in amphetamines synthesized using the Leuckart method.
    • To characterize the chemical structures of these impurities using advanced spectroscopic techniques.

    Main Methods:

    • Repeated thin-layer chromatography (TLC) with diverse solvent systems for impurity isolation.
    • High-resolution mass spectrometry (HRMS) and low-resolution mass spectrometry (LRMS) for molecular weight determination.
    • Proton (1H) and Carbon-13 (13C) Nuclear Magnetic Resonance (NMR) spectroscopy for structural elucidation.

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    Main Results:

    • Successfully isolated and identified two pyrimidine derivatives, five pyridine derivatives, and one pyridone derivative.
    • Detailed chromatographic and spectroscopic data were obtained for the identified impurities.
    • Quantitative analysis of a representative reaction mixture and a sample of illicit amphetamine was performed.

    Conclusions:

    • The Leuckart synthesis of amphetamines can lead to the formation of a range of heterocyclic nitrogen-containing impurities.
    • The identified impurities (pyrimidines, pyridines, pyridone) are not commonly reported byproducts of this synthesis route.
    • This research provides valuable data for the forensic identification and characterization of illicit amphetamine samples.