Figure 4 | Scientific Reports

Figure 4

From: Structural modification of fentanyls for their retrospective identification by gas chromatographic analysis using chloroformate chemistry

Figure 4

Trichloroethoxycarbonylation of fentanyl using optimized reaction conditions. (a) GC chromatogram of fentanyl (free base, rt = 33.5 min.; (b) mass spectrum of fentanyl; (c) GC chromatogram of first reaction product, Troc-norfentanyl (rt = 33.7 min.); (d) mass spectrum of Troc-norfentanyl showing isotopic pattern of its molecular ion peak in yellow inset; (e) GC chromatogram of second reaction product, 2-chloroethylbenzene (rt = 11.9 min.); (f) mass spectrum of 2-chloroethylbenzene.

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