Koch carbonylation using silver trifluoromethanesulfonate

Koch carbonylation was carried out using silver trifluoromethanesulfonate (AgOTf). Tertiary alcohols were transformed into the corresponding carboxylic acids in good yield under carbon monoxide atmosphere (5 MPa: initial pressure) at 150°C. It can be assumed that under these reaction conditions, a strong acid, in which a silver(I) cation participates, would be generated from AgOTf.