Table 1. Deviation of Reaction Conditions for the Trifluoromethylthiolation of 2a^a.

entry	additive	yieldb of 4a (%)	yieldb of 5a (%)	recoveryb of 2a (%)
1	1.0 equiv of KF	78	3	−
2	1.0 equiv of CsF	61	6	−
3	1.0 equiv of TBAF·3H2O	15	45	−
4	1.0 equiv of TBAT	41	3	−
5	10 mol % of DABCO	−	−	70
6	10 mol % of FeCl2	8	−	78
7c	1.0 equiv of KF	−	−	76
8	−	trace	−	75

^aGeneral procedure: 2a (0.1 mmol), 3 (0.1 mmol), and additive were stirred in MeCN (0.5 mL) at room temperature for 3 h.

^b19F NMR yield using PhCF₃ as the internal standard.

^cDCM was used as a solvent instead of MeCN.