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. Author manuscript; available in PMC: 2018 Oct 17.
Published in final edited form as: J Am Chem Soc. 2017 Jan 3;139(2):871–878. doi: 10.1021/jacs.6b11115

Figure 1. Diazaborine formation of semicarbazide.

Figure 1.

a) Schematic illustration of diazaborine formation of semicarbazide in comparison to that of phenylhydrazine. b) 1H-NMR spectra of semicarbazide mixed with equimolar 2-FPBA (top) and 2-APBA (bottom) respectively. c) Crystal structure of DAB1, the diazaborine conjugate of semicarbazide with 2-FPBA. d) Crystal structure of DAB3, a diazaborine conjugate of semicarbazide with the synthetic amino acid L-AB3.