Table 2.

Substrate scope of PhF₅CO₂H (9) in BV reaction.

entry	ketone	lactone	yielda
1			96%
2			75%
3			78%
4			48%
5			78%
6b			23%
7c			10%

^aYield was measured by comparison to an internal NMR standard, or by isolation of the product by chromatography. Except where noted, DIC was always added at 1.2 DIC equiv/h.

^bReaction run with 4 equiv DIC (Rate of additions 0.5 DIC equiv/h), 5 equiv aq H₂O₂ and DMAP (0.1 equiv) for 8 h.

^cDIC was added at 0.6 DIC equiv/h for 6 h.