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. Author manuscript; available in PMC: 2017 Nov 28.
Published in final edited form as: Org Biomol Chem. 2010 Nov 17;9(3):730–738. doi: 10.1039/c0ob00542h

Fig. 2.

Fig. 2

31P NMR spectra (proton-coupled) of the of the time course of reaction of tetrakis-tributylammonium pyrophosphate, 0.16 M, in DMF-d7 with 13C-labeled CDI. Panel A: 1.1 mol CDI per mol pyrophosphate; from top to bottom: 5, 12 and 33 min after CDI addition. Panel B: 3 mol CDI per mol pyrophosphate, from top to bottom: 5, 25 and 240 min after CDI addition. “*” Designates the condensation by-products (tetraphosphates).