Scheme 3.
The singly occupied orbitals during H-abstraction in: (a) a normal HAT reaction, PhCH2• + PhCH3 → PhCH3 + PhCH2•, and (b) PCET reaction, PhO• + PhOH → PhOH + PhO•
The singly occupied orbitals during H-abstraction in: (a) a normal HAT reaction, PhCH2• + PhCH3 → PhCH3 + PhCH2•, and (b) PCET reaction, PhO• + PhOH → PhOH + PhO•