The optimized amounts of the catalyst and oxidant in oxidation of methyl phenyl sulfide to methyl phenyl sulfoxide^a.

Entry	Co@SiO2[(EtO)3Si–L3]/Mn(iii) (g)	H2O2 30% (μL)	Selectivity (%)	Isolated yield
1	0.02	60	100	61
2	0.02	70	100	73
3	0.02	80	100	82
4	0.02	90	100	87
5	0.03	60	100	70
6	0.03	70	100	78
7	0.03	80	100	84
8	0.03	90	100	92
9	0.04	60	100	81
10	0.04	70	100	88
11	0.04	80	100	90
12	0.04	90	100	93
13	0.05	60	100	86
14	0.05	70	100	92
15	0.05	80	100	94
16	0.05	90	100	97
17	0.06	60	100	91
18	0.06	70	100	95
19	0.06	80	100	97
20	0.06	90	100	99
21	Not used	90	100	8

^aReaction condition: methyl phenyl sulfide (0.5 mmol), reaction time: 50 min, reaction temperature 65 °C.