p-Anisylmethylsulfide 11.25g (72.94mmol) was dissolved in methanol (0.3L), Oxone solid 135g (219mmol, 6 eq. of persulfate) was added in one portion and the mixture was stirred for 3 hours. (The reaction was complete in 2 hours by HPLC). The solids were removed by filtration and washed with methanol, the filtrates were evaporated. The solid residue was re-crystallized from a mix of ethanol 100mL and water 400mL (to R.T., overnight). The crystallized product was collected by flitration, washed with water, dried by suction and on highvac. Y=11.898g (87.5%) of pearl-shiny white flakes. (A second crop could be obtained from supernatants but I was lazy).
1H(d6-DMSO, 400MHz): 7.847(app d, 8.9Hz, 2H), 7.160(app d, 8.9Hz, 2H), 3.857(s, 3H), 3.152(s, 3H)