Table 1. Observed reaction rates and KIEs of 1, 2, and 3 ^a .

Substrate	1 b	2 b	3 c
Self-decay	14(4)	0.63(8)	6.3(4)
Thioanisole	No change	1.12(9)	16(8)
9,10-DHA	No change	1.2(3)	10.3(2)
9,10-DHA KIE d	>12	14(5)	9(1)

^aReported rates are 10^–6 s^–1. Reaction conditions: 2.5 mM cobalt complex, 23 °C, 25 mM substrate (250 mM for DHA).

^bMonitored via UV-vis spectroscopy in Et₂O.

^cMonitored via¹H NMR spectroscopy in CDCl₃.

^d1 : 1 mixture of 125 mM each H₄-DHA and D₄-DHA in DCM.