钯纳米粒子(Pd-NPs)在绿色条件下于水中通过NaOH还原PdCl 2并在Fe 3 O 4-木质素的支持下合成。Fe 3 O 4木质素是一种有机-无机杂化核壳,是通过超声处理Fe 3 O 4 NPs(20 nm)和碱性木质素的混合物而合成的。新材料Fe 3 O 4-木质素和Fe 3 O 4-木质素@ Pd-NPs通过PXRD,SEM和FT-IR光谱进行了表征。所述的Fe 3 ö 4 -Lignin @钯纳米颗粒是由紫外-可见光谱,TEM,EDX,HRICP-AES和TGA / DTA进一步证实。通过PXRD测定的Pd-NP的平均大小为5-10 nm。通过EDX分析得到的负载在Fe 3 O 4-木质素上的钯量为26.63质量%。从HRICP-AES获得的催化剂中的铁和钯的含量分别为每克木质素11.88(wt。%)和10.90(wt。%)。Fe 3 O 4-木质素@ Pd-NPs的催化势在Mizoroki-Heck
Ligand- and copper-free Sonogashira and Heck couplings of (Het)aryl chlorides and bromides catalyzed by palladium nanoparticles supported on in situ generated Al(OH)<sub>3</sub>
ligand- and copper-free Sonogashirareaction of (Het)aryl halides (Br and Cl) with various terminal alkynes and the Heck coupling of (Het)aryl halides (Br and Cl) with a series of olefins, catalyzed by palladiumnanoparticles supported on newly generated Al(OH)3, were developed. The catalyst can be readily recovered and reused 6 times without significant loss of activity and palladium leaching.
Ligand-Free Palladium Catalytic System Supported by CNT and its Application to the Mizoroki Heck Reactions
作者:Young-Shin Jo、Ja-Young Kim、Il-Kwon Oh、Hyun-Chul Choi、Sun-Woo Lee
DOI:10.5012/bkcs.2010.31.6.1735
日期:2010.6.20
Fe
<sub>3</sub>
O
<sub>4</sub>
‐Lignin@Pd‐NPs: A highly efficient, magnetically recoverable and recyclable catalyst for Mizoroki‐Heck reaction under solvent‐free conditions
various solvents and under solvent‐free but aerobic conditions using various inorganic and organic bases, the product n‐butyl 3‐phenylprop‐2‐enoate (1a) obtained was as high as 95% in highly polar solvents as short as in 10 min and 99% under solvent‐free conditions in 3 min at 140 °C using n‐Pr3N as base. The scope of the above catalyst was investigated in the Mizoroki‐Heckreaction of various aryl/heterocyclic
钯纳米粒子(Pd-NPs)在绿色条件下于水中通过NaOH还原PdCl 2并在Fe 3 O 4-木质素的支持下合成。Fe 3 O 4木质素是一种有机-无机杂化核壳,是通过超声处理Fe 3 O 4 NPs(20 nm)和碱性木质素的混合物而合成的。新材料Fe 3 O 4-木质素和Fe 3 O 4-木质素@ Pd-NPs通过PXRD,SEM和FT-IR光谱进行了表征。所述的Fe 3 ö 4 -Lignin @钯纳米颗粒是由紫外-可见光谱,TEM,EDX,HRICP-AES和TGA / DTA进一步证实。通过PXRD测定的Pd-NP的平均大小为5-10 nm。通过EDX分析得到的负载在Fe 3 O 4-木质素上的钯量为26.63质量%。从HRICP-AES获得的催化剂中的铁和钯的含量分别为每克木质素11.88(wt。%)和10.90(wt。%)。Fe 3 O 4-木质素@ Pd-NPs的催化势在Mizoroki-Heck