Table 3. Summary of activation enthalpy (ΔH^‡), entropy (ΔS^‡), and free energy (ΔG^‡) for phosphorus inversion of diarylphosphine-fused porphyrins.

Compound	ΔH‡ (kcal mol–1)	ΔS‡ (cal (K–1 mol–1))	ΔG‡298 (kcal mol–1)	ΔG‡203 (kcal mol–1)
6 a	14.3	1.7	13.8	14.0
10Ni a	12.7	–0.9	13.0	12.9
10Pd b	10.2	–0.5	10.3	10.3
11 b	9.1	–10.4	12.2	11.2
12 a	12.0	–3.3	13.0	12.7
13 a	12.8	–2.1	13.4	13.2
14 b	—	—	—	9.2
15 b	—	—	—	8.7

^aIn CDCl₃.

^bIn CD₂Cl₂.