Table 1.
T 1 relaxation times and polarization levels achieved for pyridines 3 through SABRE in the specified solvent. Conditions: 20 mM substrate, 5 mM [IrCl(COD)IMes], activated with 3 bar p‐H2. o = ortho, m = meta, and p = para
| Substrate | Methanol‐d 4 | Ethanol‐d 6 | ||||
|---|---|---|---|---|---|---|
| Site T 1(no cat.)/s | Site T 1(with cat.)/s | Polarization level (%) | Site T 1(no cat.) / s | Site T 1(with cat.) /s | Polarization level (%) | |
(1).
|
o—28.1 m—26.2 p—33.8 |
o—1.5 m—5.2 p—5.5 |
o—4.3 ± 0.3 m—3.4 ± 0.1 p—5.4 ± 0.1 |
o—20.7 m—18.2 p—26.7 |
o—3.2 m—4.7 p—5.3 |
o—3.9 ± 0.2 m—1.8 ± 0.1 p—4.0 ± 0.1 |
(2).
|
o—51.2 | o—5.2 | o—5.8 ± 0.4 | o—72.4 | o—4.2 | o—6.7 ± 0.4 |
(3).
|
m—113.2 | m—46.7 | m—0.6 ± 0.1 | m—72.6 | m—13.8 | m—0.9 ± 0.1 |
(4).
|
p—84.7 | p—67.0 | p–0.54 ± 0.12 | p—57.5 | p—25.0 | p—0.51 ± 0.07 |
