at room temperature. While, under the same reaction conditions [Sn IV (TPP)Cl 2 ] is less efficient to catalyze these reactions. One important feature of this catalyst is its ability in the chemoselective silylation of primary alcohols in the presence of secondary and tertiaryalcohols and phenols. The catalyst was reused several times without loss of its catalytic activity.
Preparation and characterization of a RHA/TiO<sub>2</sub>nanocomposite: introduction of an efficient and reusable catalyst for chemoselective trimethylsilyl protection and deprotection of alcohols and phenols
nanoparticles leading to the RHA/TiO2 nanocomposite. This nanocomposite was used as an efficientcatalyst for the chemoselective trimethylsilylation of various alcohols and phenols and deprotection of the obtained trimethylsilyl ethers. The procedure gave the products in excellent yields in very short reaction times. Also this catalyst can be reused at least six times without loss of its catalytic activity.
在这项工作中,稻壳灰(RHA)作为无定形二氧化硅的天然来源,被用作合成RHA / TiO 2纳米复合材料的锐钛矿相二氧化钛纳米粒子的载体。该纳米复合材料用作各种醇和酚的化学选择性三甲基甲硅烷基化和所得三甲基甲硅烷基醚的脱保护的有效催化剂。该程序在非常短的反应时间内以优异的产率获得了产物。同样,该催化剂可以重复使用至少六次,而不会损失其催化活性。
Oxidative Deprotection of Trimethylsilyl Ethers to the Corresponding Carbonyl Compounds Using Cetyltrimethylammonium Peroxodisulfate
Cetyltrimethylammonium peroxodisulfate (CTA)2S2O8 was quantitatively prepared and used for the oxidation and deprotection of trimethylsilylethers to the corresponding carbonyl compounds in acetonitrile. Selective oxidation of allylic or benzylic trimethylsilylethers in the presence of saturated alkyltrimethylsilylethers were also achieved. This new reagent is more efficient and has several advantages over
Ethylenebis(<i>N</i>-Methylimidazolium) Chlorochromate (EBMICC): A New Selective and Mild Reagent for Oxidation of Alcohols, Hydroquinones and Trimethylsilyl Ethers
yellow-orange solid which selectively oxidized benzylic and allylic alcohols, hydroquinones and trimethylsilylethers in refluxing acetonitrile. Oxidation of alcohols was also examined under solvent-free conditions and showed much better yields of the corresponding carbonyls in a very short reaction time when compared with the conventional method.
Non-C2-Symmetric, Chirally Economical, and Readily Tunable Linked-binols: Design and Application in a Direct Catalytic Asymmetric Mannich-Type Reaction