S₀ barriers (kcal mol⁻¹) calculated with pyGSM (FOMO-CASCI(6/5)/6-31G) using a minimum number of 20 images between all possible pairs of S₀ stationary points. When a number is not given, it indicates that the path connecting two species contains a notable intermediate.

FROM	TO
	Benzene	Benzvalene	Carbene	Prefulvene	trans-Benzene	H-Transfer	Fulvene	Dewar Benzene
Benzene	—	Prefulvene	Prefulvene	154.8	122.3	114.7	H-Transfer	trans-Benzene
Benzvalene	Prefulvene	—	16.3	18.7	Benzene	Benzene	Carbene	46.4
Carbene	Prefulvene	1.7	—	7.0	Benzene	Benzene	14.9	24.2
Prefulvene	17.7	1.4	4.3	—	16.5	Carbene	Carbene	13.3
trans-Benzene	1.2	Benzene	Benzene	32.7	—	Benzene	H-Transfer	19.7
H-Transfer	12.5	Benzene	Benzene	Carbene	Benzene	—	29.8	Benzene
Fulvene	H-Transfer	Carbene	102.2	Carbene	H-Transfer	84.9	—	93.9
Dewar benzene	trans-Benzene	65.6	58.0	49.8	40.1	Benzene	40.3	—