(2,4-Dichlor-phenoxy)-trimethyl-silan 在
1,4-diazabicyclo[2.2.2]octane tribromide supported on magnetic Fe3O4 nanoparticles 作用下,
以
甲醇 为溶剂,
反应 0.08h,
以95%的产率得到2,4-二氯酚
参考文献:
名称:
磁性纳米粒子支持DABCO溴化:为喹唑啉酮类和苯并咪唑和羟基的保护/脱保护合成的多功能纳米催化剂†
摘要:
发现一种新型的非均相三溴化物类型化合物,负载在磁性Fe 3 O 4纳米颗粒上的1,4-二氮杂双环[2.2.2]辛烷三溴化物(MNPs-DABCO三溴化物)是一种高效且可重复使用的纳米催化剂,可用于一锅法合成2通过分别用2-氨基苯甲酰胺和1,2-苯二胺对醛进行氧化环化反应,制得-芳基喹唑啉-4(3 H)-ones和2-芳基-1 H-苯并[ d ]咪唑。而且,MNPs-DABCO三溴化物通过在室温下改变溶剂介质,催化了多种醇和酚的三甲基甲硅烷基化/四氢吡喃基化和甲硅烷基化/脱吡喃基化。
DOI:
10.1039/c7nj00479f
作为产物:
描述:
六甲基二硅氮烷 、 2,4-二氯酚 在
1,4-diazabicyclo[2.2.2]octane tribromide supported on magnetic Fe3O4 nanoparticles 作用下,
以
neat (no solvent) 为溶剂,
反应 1.33h,
以97%的产率得到(2,4-Dichlor-phenoxy)-trimethyl-silan
参考文献:
名称:
磁性纳米粒子支持DABCO溴化:为喹唑啉酮类和苯并咪唑和羟基的保护/脱保护合成的多功能纳米催化剂†
摘要:
发现一种新型的非均相三溴化物类型化合物,负载在磁性Fe 3 O 4纳米颗粒上的1,4-二氮杂双环[2.2.2]辛烷三溴化物(MNPs-DABCO三溴化物)是一种高效且可重复使用的纳米催化剂,可用于一锅法合成2通过分别用2-氨基苯甲酰胺和1,2-苯二胺对醛进行氧化环化反应,制得-芳基喹唑啉-4(3 H)-ones和2-芳基-1 H-苯并[ d ]咪唑。而且,MNPs-DABCO三溴化物通过在室温下改变溶剂介质,催化了多种醇和酚的三甲基甲硅烷基化/四氢吡喃基化和甲硅烷基化/脱吡喃基化。
Nano Fe<sub>3</sub>O<sub>4</sub>@ZrO<sub>2</sub>/SO<sub>4</sub><sup>2−</sup>: A highly efficient catalyst for the protection and deprotection of hydroxyl groups using HMDS under solvent-free condition
the protection and deprotection process of various types of alcohols and phenols by HMDS in the presence of nano magnetic sulfated zirconia (Fe3O4@ZrO2/SO42−) as a solid acidcatalyst under very mild and solvent-free condition. This method has interesting advantages like short reaction times and a simple workup process. With regard to some outstanding benefits of this new heterogeneous catalyst such
A zirconium borohydride piperazine complex (Ppyz)Zr(BH4)2Cl2, obtained by the reaction of an ethereal solution of ZrCl4 and LiBH4 with piperazine is a stable, selective and efficientreducingagent. (Ppyz)Zr(BH4)2Cl2 reducesaldehydes, ketones, silylethers, α,β-unsaturated carbonyl compounds and esters. The reactions were performed in diethyl ether at room temperature or under reflux, and the yields
Nanomagnetic zirconia-based sulfonic acid (Fe<sub>3</sub>O<sub>4</sub>@ZrO<sub>2</sub>-Pr-SO<sub>3</sub>H): a new, efficient and recyclable solid acid catalyst for the protection of alcohols via HMDS under solvent free conditions
alcohols using hexamethyldisilazane (HMDS) under solvent-free conditions at room temperature. The solid nanocatalyst can easily be separated and reused several times without significant loss of its catalytic activity. Also, in addition to its being inexpensive and the simplicity of the separation process, this heterogeneouscatalyst has shown a good chemoselectivity in the reactions.
在本工作中,通过(3-巯基丙基)三甲氧基硅烷与纳米磁性氧化锆的反应来制备磺酸官能化的纳米磁性氧化锆。然后,通过过氧化氢和H 2 SO 4直接氧化硫醇基,合成了纳米氧化锆基磺酸(Fe 3 O 4 @ZrO 2 -Pr -SO 3 H)。随后。通过傅里叶变换红外光谱(FT-IR),场发射扫描电子显微镜(FE-SEM)成像,能量色散X射线光谱(EDX),X射线衍射(XRD)测量和振动样品磁力分析法对催化剂进行了表征( VSM)。六甲基二硅氮烷(HMDS)在无溶剂条件下于室温下用作具有高催化活性的有效纳米催化剂,用于保护醇。固体纳米催化剂可以容易地分离并重复使用数次,而不会显着降低其催化活性。而且,除了其廉价和分离过程的简便性之外,这种非均相催化剂在反应中还显示出良好的化学选择性。
Tributyltin grafted onto the surface of 3-aminopropyl functionalized γ-Fe<sub>2</sub>O<sub>3</sub>nanoparticles: a magnetically-recoverable catalyst for trimethylsilylation of alcohols and phenols
Bonding of a homogenous tributyltin chloride catalyst on the surface of functionalized magnetic nanoparticles provides a new stable, efficient and magnetically recyclable catalyst for trimethylsilylation of alcohols and phenols with hexamethyldisilazan under mild reaction conditions. The catalyst showed good stability and could be reused at least 10 times. The catalyst was characterized using spectroscopic, magnetic, and thermal techniques (FT-IR, SEM, TEM, XRD, ICP, VSM, and TGA).
One, two, three, four: A copper(I)–phosphine complex catalyzes the diborylation of alkynes and arynes, and the tri‐ or tetraborylation of propargyl ethers (see scheme; pin=pinacolato). In the latter cases, the CO bond(s) as well as the CC bond are borylated in one pot. Furthermore, a diborylation product serves as an intermediate in the efficient synthesis of ortho‐terphenyls with pharmacological