title: Reactions of silica chloride (SiO(2)Cl)/DMSO, a heterogeneous system for the facile regeneration of carbonyl compounds from thioacetals and ring-expansion annelation of cyclic thioacetals.
abstract: Silica chloride (SiO(2)Cl)/DMSO, as a heterogeneous system, has been efficiently used for deprotection of thioacetals into aldehydes in dry CH(2)Cl(2) at room temperature. Thioketals without enolizable hydrogens adjacent to a sulfur atom are converted easily to the corresponding ketones in high yields under similar reaction conditions. However, thioketals with enolizable methyl and methylene groups undergo ring-expansion reactions to afford 1,4-dithiepins and 1,4-dithiins in dry CH(2)Cl(2) at room temperature in good yields.
authors.affiliation: Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran. firouzabadi@chem.susc.ac.ir
authors.forename: Habib
authors.initials: H
authors.lastname: Firouzabadi
authors.forename: Nasser
authors.initials: N
authors.lastname: Iranpoor
authors.forename: Hassan
authors.initials: H
authors.lastname: Hazarkhani
authors.forename: Babak
authors.initials: B
authors.lastname: Karimi