34883-41-5Relevant articles and documents
Alumina as Solid-State Ligand in Enhancing the Redox Catalytic Property of Iron Oxide Grafted AlSBA-15 towards Arylation of Arene
Rajendran, Chandran,Thirumoorthy, Kulandaivellu,Satishkumar, Govindaswamy,Landau, Miron V.
, p. 4768 - 4776 (2018/10/02)
2–8 wt % iron has been grafted over SBA-15 and 10 wt % alumina grafted SBA-15 (AlSBA-15) through selective extraction deposition technique using LaFeO3 as iron precursor in acidic solution. DRS-UV spectra confirmed the presence of iron as isolated Fe(III), Fe(III)-clusters and amorphous FeOx oligomers. SEM-EDX mapping, FT-IR, XPS, HR-TEM and 27Al MAS NMR characterisation results confirmed that iron grafted over AlSBA-15 preferentially reside on the alumina. The donor-acceptor interaction of grafted iron ions with alumina atoms displaying Lewis acid properties stabilized iron at higher oxidation state Fe(III+δ). This increased the BE of Fe2p electrons (XPS) and shifted the temperature of iron reduction in 2–8 wt %Fe/AlSBA-15 materials to higher value (600 °C) compared with Fe/SBA-15 (H2-TPR). In arylation of benzene, 8 wt %Fe/AlSBA-15 demonstrated excellent redox catalytic activity with TOF close to homogeneous catalyst and 82 % biphenyl yield. The catalyst demonstrated consistent catalytic performance for 7 cycles.
An efficient Pd/Al(OH)3 nanoparticle catalyst for Suzuki coupling reactions of aryl halides
Li, Xing,Chen, Wenwen,Chang, Honghong,Shao, Zhongqi,Wei, Wenlong
, p. 1593 - 1602 (2014/06/23)
A high-performance palladium-based Pd/Al(OH)3 catalyst has been prepared by the one-pot three-component method. It was found that this 'ligandless' Pd/Al(OH)3 catalyst showed remarkable reactivity and gave excellent yields (up to 99%) towards the condensation of aryl bromides with various arylboronic acids under mild conditions, and afforded good yields of the coupling products (up to 97%) with most aryl chlorides in two different catalytic systems. Furthermore, this catalyst could be easily recovered through filtration and reused for 8 cycles without significant loss of the yield.
Palladium-bis(oxazoline) complexes with inherent chirality: Synthesis, crystal structures and applications in Suzuki, Heck and Sonogashira coupling reactions
Shakil Hussain,Ibrahim, Mansur B.,Fazal, Atif,Suleiman, Rami,Fettouhi, Mohammed,El Ali, Bassam
, p. 39 - 46 (2014/02/14)
New palladium-bis(oxazoline) (Pd-BOX) complexes were synthesized and characterized. The X-ray crystal structures of the two complexes showed that the palladium ion is bound to the nitrogen atoms of the two heterocycles of the bidentate ligand and two chloride ions in a distorted square planar geometry. The coordination to the palladium ion allows these non C2-symmetric bis(oxazoline) ligand-based complexes to acquire a rigid backbone curvature generating an inherent chirality. The catalytic activities were evaluated in Suzuki-Miyaura, Mizoroki-Heck and Sonogashira coupling reactions. The complexes showed high catalytic activities towards numerous C-C coupling reactions with various aryl halides, aryl boronic acids, alkenes and alkynes. The reactions were optimized for the most suitable temperature, solvent, and base system.
