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Population of each isomer based on the 31P{1H} NMR spectra, excluding the percentage of the free oxidized phosphine ligand (unlabeled resonances in spectra, figure 2).
| Nickel peptide complex | Up-up (A) and down-down (B) (%) | Down-up (C) (%) | Restricted down-up (D) (%) |
|---|---|---|---|
| Meth-K8 | <1 | <1 | >99 |
| Meth-K10 | <1 | <1 | >99 |
| Prop-K8 | 16 | 23 | 61 |
| Prop-K10 | 29 | 31 | 40 |
| Prop-R10a | 34 | 41 | 25 |
Reported previously [27]
