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. Author manuscript; available in PMC: 2014 Jul 22.
Published in final edited form as: Org Biomol Chem. 2013 May 14;11(18):2979–2987. doi: 10.1039/c3ob27464k

Table 1. The effects of imidazole concentration on reaction product compositions, as determined from LC-MS peaks, at room temperature with starting peptide concentration of 1 mM.

Imidazole concentration (M) Percent composition Reaction time (h)
Cyclic monomer Cyclic dimer Starting peptide
0.3 14.1 8.9 77.0 126
0.5 71.7 6.9 21.4 120
1.0 84.8 15.2 — 24
1.5 92.3 7.7 — 24