Cross-linked poly(4-vinylpyridine/styrene) copolymer-supported bismuth(III) triflate: an efficient heterogeneous catalyst for silylation of alcohols and phenols with HMDS
作者:Sang-Hyeup Lee、Santosh T. Kadam
DOI:10.1002/aoc.1809
日期:2011.8
Cross‐linked poly(4‐vinylpyridine/styrene) copolymer‐supported bismuth(III) triflate (30P/S‐Bi) effectively activates hexamethyldisilazane (HMDS) for the silylation of alcohols and phenols. By the use of this heterogeneous catalytic system, a wide range of alcohols as well as phenols are converted into their corresponding trimethylsilyl ethers in high yield under mild reaction conditions. The catalyst was reused
An asymmetric Salamo-based Zn complex supported on Fe<sub>3</sub>O<sub>4</sub> MNPs: a novel heterogeneous nanocatalyst for the silyl protection and deprotection of alcohols under mild conditions
作者:Hongyan Yao、Yongsheng Wang、Maryam Kargar Razi
DOI:10.1039/d1ra01185e
日期:——
Fe3O4@H2L-Zn MNPs as a magnetically separable, recyclable and reusable heterogeneous catalyst. Fe3O4@H2L-Zn MNPs were also applied for the removal of silyl protecting groups from hydroxyl functions using water in CH2Cl2 under green conditions. The catalyst demonstrated good to excellent catalytic yield efficiency for both the reactions compared to the commercial metal-based catalysts under green conditions for
在本研究中,磁性不对称 Salamo 基 Zn 配合物(H 2 L = salen 型二希夫碱)负载在改性 Fe 3 O 4 (Fe 3 O 4 @H 2 L-Zn) 的表面上作为一种新的磁性材料。催化剂通过多种分析技术进行设计和表征,例如 FT-IR 光谱、XRD、EDS、ICP-AES、SEM、TEM、TGA 和 VSM。提出了一种有效且可持续的合成方案,用于在温和条件下通过醇的甲硅烷基保护合成甲硅烷基醚子结构。该合成方案涉及各种含羟基底物和作为廉价甲硅烷基化剂的六甲基二硅氮烷(HMDS)之间的双组分无溶剂反应,使用Fe 3 O 4 @H 2 L-Zn MNP作为磁性可分离、可回收和可重复使用的多相催化剂。 Fe 3 O 4 @H 2 L-Zn MNP 也可用于在绿色条件下使用 CH 2 Cl 2中的水从羟基官能团中去除甲硅烷基保护基团。与商业金属基催化剂相比,该催化剂在绿色条件下对多种底物表现出良好至优异的催化产率。