Table 2. Comparison of rates and % PROS values of different porphyrins.

Catalysts	Effect	Rate (Kcat) (M–1 S–1)	PROS (%) C16SH SAM	Ref.
PPSR-yne (Fig. 8A)	Only ‘push’ from the axial site	1.11 × 107	22	15
FeCu–phenol (Fig. 8B)	Redox species in the 2nd sphere	1.2 × 105	11	11
FeFc4 (Fig. 8C)	Redox species + H-bond (2nd sphere)	5 × 104	10	35
Fc3(CH3Ph)–PorCo (Fig. 8D)	Electron donor groups in the 2nd sphere		100 (EEPG)	33
FeL2 (Fig. 8E)	H-bond + protonated basic grp. (2nd sphere)	1.80 × 107	5	26
FeIIICl–MARG (Fig. 2)	H-bond + protonated basic grp. (2nd sphere)	4.2 × 106	18
Fe–MARG–N-MeImd (Fig. 8F)	H-bond + protonated basic grp. (2nd sphere) + push effect	1.76 × 106	7