25798-47-4Relevant academic research and scientific papers
Synthesis of bis-oxazoline-ruthenium(II)-arene complexes. Combined catalytic isomerisation and Claisen rearrangement of bis-allyl ether
Ammar, Hamed Ben,Notre, Jerome Le,Salem, Mansour,Kaddachi, Mohamed T.,Dixneuf, Pierre H.
, p. 63 - 69 (2002)
Bis-oxazolines 1a-c and 2-benzothiazol-2-ylmethyl-benzooxazole (1d) (N-N) react with [RuCl2(p-cymene)]2 in polar solvent with NH4BF4 or NH4PF6 and lead to ionic arene-ruthenium complexes [RuCl(N-N)(p-cymene)]+X- (3a-d) in quantitativ
Ti (IV) complexes of some heterocyclic ligands synthesis, characterization and ethylene polymerization activity
Elagab, Hamdi Ali
, p. 681 - 700 (2016/05/09)
31 complexes of bis - (benzimidazole, benzothiazole and benzoxazole) compounds with Ti (IV) metal centers were synthesized, characterized, activated with methylalumoxane (MAO) and then tested for catalytic ethylene polymerization. The activities of the various catalysts were found to be functions of the hetero atoms in the ligand frameworks. The highest activity was obtained with 39/MAO (573 kg PE/mol cat. h). The produced polyethylenes showed high molecular weights (up to 1.5 × 106 g/mol) and broad molecular weight distributions (PD = 65). This could result from different interactions of the MAO counterion with the heteroatoms of the catalyst ligand generating different active sites.
Zr(IV) complexes of some heterocyclic ligands: Synthesis, characterization, and ethylene polymerization activity
Elagab, Hamdi Ali
, p. 742 - 761 (2016/11/09)
Thirty-one complexes of bis-(benzimidazole, benzothiazole, and benzoxazole) compounds with Zr(IV) metal centers were synthesized, characterized, activated with methylaluminoxane (MAO), and then tested for catalytic ethylene polymerization. The activities of the various catalysts were found to be functions of the heteroatoms in the ligand frameworks and the structure around the active metal center. The highest activity was obtained with 38/MAO (424 kg E/mol cat. h). The produced polyethylenes showed high molecular weights (41/MAO, 1.9 × 106 g/mol) and broad molecular weight distributions (38/MAO, Mw = 9.64 × 105 g/mol, PD = 23). This could result from different interactions of the MAO counter ion with the heteroatoms of the catalyst ligand generating different active sites.
Structure-property-relationship studies with ethylene polymerization catalysts of Ti, Zr and V containing heterocyclic ligands
Elagab, Hamdi Ali,Alt, Helmut G.
, p. 26 - 35 (2015/09/01)
21 complexes of bis(benzimidazolyl, benzothiazolyl and benzoxazolyl)methane compounds with Zr(IV), Ti(IV), V(III) metal centers were synthesized, characterized, activated with methylalumoxane (MAO) and then tested for catalytic ethylene polymerization. The activities of the various catalysts were found to be functions of the hetero atoms in the ligand frameworks. The methylene moiety as bridging unit of the two heterocyclic ring systems gave higher catalyst activities than the corresponding 1,2-ethylidene derivatives indicating a strong influence of the bridging unit of the ligand on the catalyst activity. The activity of the catalyst system 10/MAO was investigated with different cocatalyst concentrations. The highest activity was obtained with 23/MAO (573 kg PE/mol cat h). The produced polyethylenes showed high molecular weights (up to 1.77·106 g/mol) and broad molecular weight distributions (up to PD = 64.5). This could result from different interactions of the MAO counterion with the heteroatoms of the catalyst ligand generating different active sites. These catalysts open an easy access to single-reactor multimodal polyethylene technology.
