The bis-1,4-dimesityl-1,2,3-triazol-5-ylidene–palladium complex (1a) successfully catalyzes the Mizoroki–Heck and Sonogashira coupling reactions with aryl bromides to give the corresponding alkenes and alkynes, respectively, in good to excellent yields. In the Mizoroki–Heck reaction, electron-rich, electron-poor, and functionalized aryl bromides and alkenes are tolerated, while the substrates are limited
N‐heterocyclic carbene–palladium(II) complex supported on magnetic mesoporous silica for Heck cross‐coupling reaction
作者:Ayat Nuri、Yagoub Mansoori、Abolfazl Bezaatpour
DOI:10.1002/aoc.4904
日期:2019.6
N‐heterocyclic carbene–Pd(II) complex. The obtained catalyst was characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, energy‐dispersive X‐rayanalysis, vibrating sample magnetometry, Brunauer–Emmett–Teller surface area measurement and X‐raydiffraction. The amount of the loaded complex was 80.3 mg g−1, as calculated through thermogravimetric analysis. The formation of the
磁性介孔二氧化硅是通过将磁铁矿纳米粒子嵌入介孔二氧化硅(SBA-15)的通道之间而制备的。然后将制得的复合材料(Fe 3 O 4 @SiO 2 -SBA)与3-氯丙基三乙氧基硅烷,咪唑内酯钠和2-溴吡啶反应,得到3-(吡啶-2-基)-1 H-咪唑-3-丙基丙基Fe 3 O 4 @SiO 2 -SBA作为Pd(II)的负载型钳位配体。官能化的磁性介孔二氧化硅进一步与[PdCl 2(SMe 2)2]生成受支持的N杂环卡宾-Pd(II)配合物。使用傅里叶变换红外光谱仪,扫描电子显微镜,能量色散X射线分析,振动样品磁力分析,Brunauer-Emmett-Teller表面积测量和X射线衍射对所得催化剂进行表征。负载复合物的量为80.3 mg g -1,通过热重分析计算得出。使用低角度X射线衍射和透射电子显微镜确认了SBA-15有序介孔结构的形成。此外,X射线光电子能谱证实了磁性载体上存在Pd(II
A New Nitrogen Pd(II) Complex Immobilized on Magnetic Mesoporous Silica: A Retrievable Catalyst for C–C Bond Formation
nano-particles (MNPs) between SBA-15 channels. DPPE palladium dichloride (MNP@SiO2-SBA-DPPE-Pd(II)) was then prepared via click chemistry and fully characterized. The activity and recyclability of supported magnetic Pd(II) catalyst were evaluated in Heckcouplingreactionafter optimizing the optimal reaction conditions including solvent, amount of catalyst, base and temperature. Aryl iodides and aryl bromides