1,3-Oxathiolanes can be selectively cleaved in the presence of dithioacetals using 4-nitrobenzaldehyde catalyzed by TMS-OTf: J. Chem. Soc., Chem. Commun., 1937 (1994). This combination has been used for conversion of thioketones to ketones: Tetrahedron Lett., 36, 2277 (1995).