A general experimental procedure is described as following: a mixture of thioketal (100 mg) and NaI (10 eq) was stirred in MeCN for 5 min. Then, 10 eq of TMSCl were added to the solution which was stirred for 24 h at rt. The reaction was then hydrolyzed for 5 min. with H2O (5 mL) and extracted with CH2Cl2. Organic layers were dried over MgSO4 and concentrated under reduced pressure to give a residue which was purified by chromatography on silica gel to give the expected carbonyl compound which have identical NMR spectra with starting ketones.