Table 1 Oxidation of 4-Hexylresorcinol to V with different oxidizing agents

1

Salcomine (0.01 eq.) ,DMF, 110°C, 3 h

30^a

2

Salcomine (1 eq.), DMF, rt, 6 h

50^a

3

Etanol/air, Petroleum ether, KOH 5%, 0°C, 5 h

33

4

Fremy’s salt, Aliquat336/Ph, Na₂CO_3, rt, 18 h

30^a

5

Fremy’s salt, H₂O, Na₂HPO_4, rt to 50°C, 36 h

22

6

Fremy’s salt, H₂O/EtOAc, Na₂HPO_4, 0°C to rt, 18 h

50

7

Fremy’s salt, H₂O/THF, Na₂CO_3,rt, 10 h

60