Fig. 4: Control experiments and mechanistic investigations.

a Quench of radical intermediates. TEMPO tetramethylpiperidine oxide. b Reactions with alkyl zinc reagents. c Time course for 2a and 3a under standard conditions.
a Quench of radical intermediates. TEMPO tetramethylpiperidine oxide. b Reactions with alkyl zinc reagents. c Time course for 2a and 3a under standard conditions.