primary and secondary alcohols and phenols can be converted efficiently to their corresponding TBDMS ethers using TBDMCS/imidazole undersolvent-freeconditions. Elimination of DMF, accompanied with an easy non-aqueous work-up and a high rate enhancement of the reaction are worthy to be mentioned for the presented method. The reactions show absolute chemoselectivity for the protection of primary in the
NEW APPLICATIONS OF SOLID SILICA CHLORIDE (─SiO<sub>2</sub>Cl): EFFICIENT OXIDATION OF CYCLIC THIOACETALS, TMS, TBDMS, AND THP ETHERS TO THEIR CARBONYL COMPOUNDS BY SOLID SILICA CHLORIDE/KMnO<sub>4</sub> SYSTEM
aromatic and aliphatic cyclic thioacetals (1,3-dithiolanes, 1,3-dithianes) and silyl and pyranyl ethers into their corresponding carbonylcompounds in dry CH3CN at room temperature in high yields. Over-oxidation of aldehydes to carboxylic acids has not been observed by this system. In the absence of silica chloride, KMnO4 in dry CH3CN is an ineffective reagent for these oxidations.
Silica-coated Fe<sub>3</sub>O<sub>4</sub> magnetic nanoparticles-supported sulfonic acid as a highly active and reusable catalyst in chemoselective deprotection of tert-butyldimethylsilyl (TBDMS) ethers
employed in the deprotection of TBDMS ethers. The prepared magnetically separable nanocatalyst exhibited efficient catalytic activity with high conversion and selectivity in cleavage of TBDMS ethers. TBDMS ethers are efficiently cleaved to the corresponding hydroxyl compounds in methanol solution containing 2 mol% magnetic nano-catalysts. Good to excellent yields of products, simple work-up and product
Aluminum Chloride (Alcl<sub>3</sub>) Promotes Selective Oxidative Deprotection of Benzylic Trimethylsilyl and <i>Tert-</i> Butyldimethylsilyl Ethers to the Corresponding Carbonyl Compounds with Manganese Dioxide (Mno<sub>2</sub>)
Abstract Various types of trimethylsilyl and tert-butyldimethylsilyl ethers of primary and secondary benzylic alcohols could be selectively converted to their corresponding carbonylcompounds with MnO2 in the presence of AlCl3 in good to excellent yields.