Table 1. Signal enhancement and relaxation data associated with 1, 2 and 3 under SABRE in a 5 mm NMR tube with the indicated catalyst: substrate ratios.
| Substrate |
1
|
2
|
3
|
|||
| Catalyst: substrate ratio | 1 : 5 | 1 : 20 | 1 : 5 | 1 : 20 | 1 : 5 | 1 : 20 |
| Enhancement factor (by shake & drop) | H5: –1025 ± 70 | H5: –280 ± 50 | H4: –860 ± 120 | H4: –220 ± 50 | H5: –1540 ± 220 | H5: –460 ± 80 |
| H6: –1150 ± 80 | H6: –300 ± 50 | H5: +450 ± 110 | H5: +90 ± 25 | H6: –1230 ± 170 | H6: –310 ± 65 | |
| T 1 (s) | H5: 11.9 ± 0.4 | H5: 11.4 ± 0.4 | H4: 11 ± 0.5 | H4: 10 ± 0.4 | H5: 21 ± 1.7 | H5: 20.2 ± 1.5 |
| H6: 7.6 ± 0.2 | H6: 7.1 ± 0.3 | H5: 11 ± 0.5 | H5: 10.3 ± 0.4 | H6: 17.9 ± 0.9 | H6: 17.1 ± 0.5 | |
| T LLS (s) | 37 ± 4 | 38 ± 6 | 47 ± 6 | 49 ± 8 | 49 ± 7 | 45 ± 8 |