Forensic Science International

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Forensic Science International GC–MS and IR studies on the six ring regioisomeric dimethoxybenzoyl-N- methylpiperazines (DMBzMPs) Karim M. Abdel-Hay, Cameron M. Terrell, Jack DeRuiter, C. Randall Clark Forensic Science International Volume 237, Pages 53-61 (April 2014) DOI: 10.1016/j.forsciint.2014.01.010 Copyright © 2014 Elsevier Ireland Ltd Terms and Conditions

Fig. 1 EI mass spectra for the six regioisomeric dimethoxybenzoyl-N-methylpiperazines. Forensic Science International 2014 237, 53-61DOI: (10.1016/j.forsciint.2014.01.010) Copyright © 2014 Elsevier Ireland Ltd Terms and Conditions

Fig. 2 Mass spectral fragmentation for the six regioisomeric dimethoxybenzoyl-N-methylpiperazines. Forensic Science International 2014 237, 53-61DOI: (10.1016/j.forsciint.2014.01.010) Copyright © 2014 Elsevier Ireland Ltd Terms and Conditions

Fig. 3 Mass spectra for the d3- and d8- derivatives of 2, 5-dimethoxybenzoyl-N-methylpiperazine. Forensic Science International 2014 237, 53-61DOI: (10.1016/j.forsciint.2014.01.010) Copyright © 2014 Elsevier Ireland Ltd Terms and Conditions

Fig. 4 Mechanism for the formation of the m/z 70 cation in the six regioisomeric dimethoxybenzoyl-N-methylpiperazines. Forensic Science International 2014 237, 53-61DOI: (10.1016/j.forsciint.2014.01.010) Copyright © 2014 Elsevier Ireland Ltd Terms and Conditions

Fig. 5 Mechanism for the formation of the m/z 83 cation in the six regioisomeric dimethoxybenzoyl-N-methylpiperazines. Forensic Science International 2014 237, 53-61DOI: (10.1016/j.forsciint.2014.01.010) Copyright © 2014 Elsevier Ireland Ltd Terms and Conditions

Fig. 6 Mechanism for the formation of the m/z 207 cation in the six regioisomeric dimethoxybenzoyl-N-methylpiperazines. Forensic Science International 2014 237, 53-61DOI: (10.1016/j.forsciint.2014.01.010) Copyright © 2014 Elsevier Ireland Ltd Terms and Conditions

Fig. 7 FTIR spectra of the six dimethoxybenzoyl-N-methylpiperazines. Forensic Science International 2014 237, 53-61DOI: (10.1016/j.forsciint.2014.01.010) Copyright © 2014 Elsevier Ireland Ltd Terms and Conditions

Fig. 8 Gas chromatographic separation of the six regioisomeric dimethoxybenzoyl-N-methylpiperazines. Forensic Science International 2014 237, 53-61DOI: (10.1016/j.forsciint.2014.01.010) Copyright © 2014 Elsevier Ireland Ltd Terms and Conditions