Table 1. Reaction Optimization^*.

Entry	Deviation from Standard Conditions	Yielda (%)	RCY (%)
1	with NEt3·3HF (2 equiv), 3a (1 mol%) in CH2Cl2 (0.2 M) for 16 h	84%
2	with KF (2 equiv), HFIP (10 equiv), 3a (1 mol%) in CH2Cl2 (0.05 M) for 16 h	20%
3	with CsF (2 equiv), HFIP (10 equiv), 3a (1 mol%) in CH2Cl2 (0.05 M) for 16 h	59%
4	none		92 ± 4n=3
5	no photocatalyst		0n=1
6	no irradiation		0n=1
7	no HFIP		11n=1
8	in THF		51n=1
9	with 4CzIPN		90n=1
10	2 min reaction time		71n=1
11	0.005 mmol substrate loading		66n=1
12	no N2 degassing		82n=1

^*[¹⁸F]KF was prepared with a K₂CO₃ (0.011 mmol)/K₂₂₂ (0.020 mmol) elution protocol. RCY: radiochemical yield determined by radioHPLC. Redox potentials given versus SCE.¹⁵

^aDetermined by quantitative ¹⁹F NMR.