Table 1.

Typical radical lifetimes of non-heme iron enzymes and synthetic metalloporphyrins determined by norcarane

	T4moH	sMMO	AlkB	NDO	Mn(TMP)OAc	Fe-4-TMPyP
[U]/[R]	19	240	5.3	0.34	15.2	6
τ	263 ps	20 ps	1 ns	11 ns	330 ps	81 psa

^aTetramethylcyclopropane (TMCP) was used as radical clock substrate