Department of Chemistry, Shiraz University, Shiraz, I.R. IRAN
Zinc chlorochromate nonahydrate is easily prepared from the aqueous solution of chromium trioxide and zinc chloride in quantitative yield. This oxidant, in methylene chloride and at room temperature, oxidizes thiols to their disulfides. Acetals and thioacetals are deprotected to their corresponding carbonyl compounds. Sulfides are selectively converted to ther sulfoxides or sulfones. Aryloxyranes undergo carbon-carbon bond cleavage and produce the corresponding aldehydes. Cyclohexane oxide yields 2-hydroxy cyclohexanone. Trimethylsilyl ethers are also deprotected and converted to the corresponding carbonyl compounds in high yields.