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. Author manuscript; available in PMC: 2007 Nov 21.
Published in final edited form as: Tetrahedron Asymmetry. 2007 Jul 4;18(12):1391–1397. doi: 10.1016/j.tetasy.2007.06.012

Figure 3.

Figure 3

31P NMR spectra for racemic mixtures of four types of chiral phosphorus compounds utilized in this investigation in the presence of FBTrp. (A) Phosphonamidate 18. (B) phosphinate ester 12. (C) methyl phosphonate ester 7. (D) phosphate triester 15.