Effect of catalyst amount and solvent on sulphoxidation of thioanisole^a.

Entry	Catalyst (mol%)	TFE/water	Yieldb (%)
1	0	2 : 1	Trace
2	5	2 : 1	40
3	10	2 : 1	70
4	20	2 : 1	68
5	10	1 : 0	9
6	10	1 : 2	49
7	10	0 : 1	0.15

^aConditions: substrate (0.194 mmol), AA (1 eq.).

^bYield determined by HPLC.