Table 2.

T ₁ relaxation times (s) and polarization levels found for the methyl isonicotinates 4 and the isonicotinamides 5. Conditions: 20 mM substrate, 5 mM [IrCl(COD)IMes], activated with 3 bar p‐H₂. o = ortho and m = meta

Substrate	Methanol‐d 4
	Site T 1(no cat.)/s	Site T 1(with cat.)/s	Polarization level (%)
(5).	o—14.2 m—14.1	o—1.9 m—3.9	o—4.8 ± 0.1 m—1.0 ± 0.1
(6).	o—9.6 m—9.6	o—2.9 m—5.8	o—2.2 ± 0.1 m—1.4 ± 0.1
(7).	o—61.9 m—61.2	o—3.5 m—21.4	o—5.4 ± 0.4 m—5.6 ± 0.3
(8).	o—70.7	o—4.1	o—7.4 ± 0.3
(9).	m—72.8	m—16.1	m—7.4 ± 0.4
(10).	o—8.2 m—8.3	o—1.7 m—3.5	o—2.6 ± 0.2 m—0.2 ± 0.02
(11).	o—7.4 m—8.3	o—2.3 m—4.1	o—3.5 ± 0.3 m—0.4 ± 0.1
(12).	o—18.2 m—42.7	o—4.2 m—16.0	o—11.0 ± 0.5 m—11.1 ± 0.5
(13).	o—23.4	o—2.9	o—5.8 ± 0.7
(14).	m—47.2	m—8.3	m—4.2 ± 0.1