Alkane Carbonylation with Carbon Monoxide on Sulfated Zirconia: NMR Observation of Ketone and Carboxylic Acid Formation from Isobutane and CO This work was supported by grant No. 99-03-32454 from the Russian Foundation for Basic Research (RFBR) and in part by a joint RFBR-INTAS grant (No. 95-0194). The authors sincerely thank Dr. V. N. Sidelnikov for GC-MS analysis.