We next wished to examine the scope of sulfonic acid partner (Scheme 2). We were pleased to find that a variety of sulfonic acids engaged productively in this oxidation reaction. Several aryl halides were tolerated, and electron rich moieties such as methoxy groups survived (Scheme 2, Entry 1). With many of these sulfonic acids, good product yields could be achieved using either PhI(OAc)2 or iodomesitylene diacetate. We found, however, that with "bulkier" sulfonic acids (Scheme 2, Entries 2, 4, 5, and 6), better results were achieved with the more electrophilic (and likely more reactive) PIFA. The reaction was not limited to aryl sulfonic acids. Indeed, alkyl sulfonic acids were also very compatible (Scheme 2, Entries 3 and 5). A fivefold increase in scale was tolerated without a large diminution in reaction yield (Scheme 2, Entry 3).