TY - JOUR A1 - LaMartina, Kelsey B. A1 - Kuck, Haley K. A1 - Oglesbee, Linda S. A1 - Al-Odaini, Asma A1 - Boaz, Nicholas C. T1 - Selective benzylic C–H monooxygenation mediated by iodine oxides JF - Beilstein Journal of Organic Chemistry PY - 2019/// VL - 15 SP - 602 EP - 609 SN - 1860-5397 DO - 10.3762/bjoc.15.55 PB - Beilstein-Institut JA - Beilstein J. Org. Chem. UR - https://doi.org/10.3762/bjoc.15.55 KW - acetoxylation KW - benzylic KW - iodate KW - NHPI KW - oxidation KW - radical N2 - A method for the selective monooxdiation of secondary benzylic C–H bonds is described using an N-oxyl catalyst and a hypervalent iodine species as a terminal oxidant. Combinations of ammonium iodate and catalytic N-hydroxyphthalimide (NHPI) were shown to be effective in the selective oxidation of n-butylbenzene directly to 1-phenylbutyl acetate in high yield (86%). This method shows moderate substrate tolerance in the oxygenation of substrates containing secondary benzylic C–H bonds, yielding the corresponding benzylic acetates in good to moderate yield. Tertiary benzylic C–H bonds were shown to be unreactive under similar conditions, despite the weaker C–H bond. A preliminary mechanistic analysis suggests that this NHPI-iodate system is functioning by a radical-based mechanism where iodine generated in situ captures formed benzylic radicals. The benzylic iodide intermediate then solvolyzes to yield the product ester. ER -