Table 4. Visible-light-induced oxidation of sulfides into sulfoxide with O₂ on TiO₂ with TEA as redox mediator ^a .

Entry	Substrate	Product	T (h)	Conv. b (mol%)	Select. b (mol%)
1 c			22	81	93
2			10	84	92
3			10	85	93
4			10	82	95
5			10	81	98
6			10	76	95
7			12	81	88
8			12	84	86
9			12	86	85
10			12	33	92
11 d			12	62	79
12			12	77	88
13			12	50	80

^aReaction conditions: 0.3 mmol of sulfide, 0.03 mmol of TEA, 40 mg of Degussa P25 TiO₂, 300 W Xe lamp, 5 mL of CH₃OH, λ > 400 nm, 0.1 MPa of O₂.

^bDetermined by GC-FID using chlorobenzene as the internal standard, conversion of sulfide, selectivity of the corresponding sulfoxide.

^c0.6 mmol of thioanisole, 0.015 mmol of TEA.

^d0.1 mmol of TEA.