Table 2.

Synthesis of Pentafluorophenyl Oxiranes.

Entry	Ketone 1	Product 2	Yield, %[a] (dr)
1	1a	2a	92 90[b]
2	1b	2b	>99
3	1c	2c	74
4	1d	2d	70
5	1e	2e	66
6	1f	2f	88
7	1g	2g	65
8	1h	2h	82
9	1i	2i	53
10	1j	2j	62
11	1k	2k	60
12	1l	2l	81 (95:5) 90 (95:5) [c]
13	1m	2m	85 (93:7)

^[a]Isolated yields of 0.5 mmol reactions.

^[b]Reaction was in toluene medium.

^[c]A 10 mmol reaction in toluene.