888324-25-2Relevant academic research and scientific papers
Aluminum methyl and isopropoxide complexes with ketiminate ligands: Synthesis, structural characterization and ring-opening polymerization of cyclic esters
Altaf, Cigdem Tuc,Wang, Haobing,Keram, Maryam,Yang, Yang,Ma, Haiyan
, p. 11 - 20 (2014)
Mono(ketiminate) aluminum dimethyl complexes 1a-5a and bis(ketiminate) aluminum methyl complex 2b were synthesized via the reactions of AlMe 3 with various N-aryl substituted ketimine compounds in a 1:1 or 1:2 molar ratio, respectively. The rea
A novel and reusable magnetic nanocatalyst developed based on graphene oxide incorporated strontium nanoparticles for the facial synthesis of β-enamino ketones under solvent-free conditions
Mousavi, Seyyed Rasul,Sereshti, Hassan,Rashidi Nodeh, Hamid,Foroumadi, Alireza
, (2018/10/26)
A novel magnetic SrFeGO nanocatalyst (NC) was synthesized through a simple sol–gel technique by introducing strontium and iron oxide nanoparticles onto graphene. The synthesized NC was characterized using FT-IR and FE-SEM. Subsequently, the catalytic activity of SrFeGO was tested in a reaction between β-dicarbonyl compounds and aniline derivatives to gain β-enamino ketone derivatives under solvent-free conditions. It was found that SrFeGO NC is a potential catalyst for the synthesis of β-enamino ketones. The β-enamino ketone produced by such reactions could be isolated in high purity without the need for chromatographic purifications. The newly prepared magnetic graphene oxide nanocomposite could be recovered and reused for numerous times with no significant decrease in efficiency. Moreover, the protocol has the advantages of excellent yielding (up to 98%) in short a reaction time, benefitting an easy workup procedure and being environmentally friendly.
Zirconium and hafnium complexes supported by linked bis(β- diketiminate) ligands: Synthesis, characterization and catalytic application in ethylene polymerization
Gong, Shaogang,Ma, Haiyan,Huang, Jiling
experimental part, p. 8237 - 8247 (2010/03/04)
Zirconium and hafnium complexes bearing new 1,2-ethanediyl- or 1,3-propanediyl-linked bis(β-diketiminate) ligands, [{CnH 2n-(BDIAr)2}MCl2] (Ar = 2,6-Me 2-C6H3, 2,6-Cl2-C6H 3, 2,6-iPr2-C6H3; M = Zr, n = 2 (4a-c), n = 3 (5a-c); M = Hf, n = 2 (6b)), were synthesized via the reaction of MCl4·2THF and one equivalent of dilithium salt of the corresponding ligand. Distorted trigonal prismatic and octahedral coordination geometries as well as C1-symmetric structures are found for zirconium complexes 4c and 5c in the solid state. Variable temperature 1H NMR spectra indicated the fluxional nature of 4a and 5a in solution. Upon activation with methylaluminoxane (MAO), all these complexes except hafnium complex 6b displayed moderate catalytic activities for ethylene polymerization. 1,2-Ethanediyl-linked complexes 4a and 4b are generally more active than their 1,3-propanediyl-linked analogues. The substituents at the ortho-positions of the phenyl rings have different effect on the catalytic activities of 1,2-ethanediyl-linked series or 1,3-propanediyl-linked series. It is noteworthy that even at a low Al/Zr molar ratio of 500, the catalytic activities of these zirconium complexes could be retained. Polyethylenes with broad molecular weight distributions (MWD = 15.3-20.3) were produced, which might result from the fluxional character of the zirconium complexes. The linear structure of obtained polyethylenes was further determined by 13C NMR spectroscopy and DSC analysis. The Royal Society of Chemistry 2009.
