Table 4.
Chemical purities of final compounds 7a-7i obtained from quantitative NMR analysis with pyrazine as a standard (see qNMR spectra in Fig. S3)
| Compound | qNMR purity |
|---|---|
| 7a | >99% |
| 7b | >99% |
| 7c | >97% |
| 7d | >99% |
| 7e | >96% |
| 7f | >97% |
| 7g | >98% |
| 7h | >98% |
| 7i | >99% |
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