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Analysis of six 'neuro-enhancing' phenidate analogs
Helge Klare1, Jörg M Neudörfl2, Simon D Brandt3
1Central Customs Authority, Centre of Education and Science, Merianstrasse 110, 50765, Cologne, Germany.
Drug Testing and Analysis
|January 10, 2017
Summary
Six phenidate analogues were analyzed using multiple techniques, revealing their threo-configuration and unexpected axial substituent positioning due to N-benzyl substitution. Thermal decomposition products were identified, impacting administration routes and aiding forensic analysis of new psychoactive substances.
Area of Science:
- Analytical Chemistry
- Organic Chemistry
- Forensic Science
Background:
- Phenidates are a class of psychoactive substances with emerging forensic relevance.
- Understanding their chemical properties and analytical behavior is crucial for identification and control.
Purpose of the Study:
- To comprehensively characterize six phenidate analogues.
- To investigate their structural configurations, including stereochemistry and substituent positioning.
- To elucidate their thermal decomposition pathways and fragmentation patterns for forensic applications.
Main Methods:
- X-ray crystallography for structural determination.
- Nuclear Magnetic Resonance (NMR) spectroscopy for structural elucidation.
- Gas Chromatography-Mass Spectrometry (GC-MS) and Electrospray Ionization-Tandem Mass Spectrometry (ESI-MS/MS) for analysis and fragmentation studies.
- Infrared (IR) spectroscopy (ATR-FTIR and GC solid-state IR) for functional group analysis.
- Density Functional Theory (DFT) computations for mechanistic insights.
Main Results:
- All analyzed phenidates exclusively exhibited the threo-configuration.
- N-benzyl substitution induced an axial positioning of piperidine substituents in the crystal state, contrasting with solution behavior.
- GC-MS analysis revealed thermal decomposition into 2-aryl-ethyl-acetates and 2,3,4,5-tetrahydropyridines.
- Fragmentation pathways and mass spectra of decomposition products were detailed.
- High purity of the synthesized phenidate samples was confirmed.
Conclusions:
- The study provides detailed analytical fingerprints for six phenidate analogues.
- Thermal instability suggests smoking or vaping may be less effective administration routes.
- The findings offer valuable reference data for forensic chemists identifying novel psychoactive substances.