423719-59-9Relevant academic research and scientific papers
Titanium isopropoxide complexes of a series of sterically demanding aryloxo based [N2O2]2- ligands as precatalysts for ethylene polymerization
Panda, Manas K.,Kaur, Sukhdeep,Reddy, Annapureddy Rajasekhar,Shaikh, Mobin M.,Butcher, Ray J.,Gupta, Virendrakumar,Ghosh, Prasenjit
scheme or table, p. 11060 - 11068 (2011/01/09)
Several titanium isopropoxide complexes [N,N′-bis(2-oxo-3-R 1-5-R2-phenylmethyl)-N,N′-bis(methylene-p-R 3-C6H4)-ethylenediamine]Ti(O iPr)2 [R1 = t-Bu, R2 = Me, R 3 = H (1b); R1 = R2 = t-Bu, R3 = H, (2b); R1 = R2 = Cl, R3 = H, (3b), R1 = t-Bu, R2 = Me, R3 = Cl (4b); R1 = R 2 = t-Bu, R3 = Cl, (5b); R1 = R2 = R3 = Cl, (6b)] supported over sterically demanding aryloxy based [N2O2]H2 ligands have been designed as precatalysts for the ethylene polymerization. Specifically, the 1b-6b complexes, when treated with methylaluminoxane (MAO) under 88 ± 0.5 psi of ethylene at 30 °C for 3 h, produced polyethylene polymers of high molecular weight (Mw = ca. 7.2-8.3 × 105 g mol-1) having broad molecular weight distribution (PDI = ca. 13.1-14.6). The 1b-6b complexes were conveniently synthesized from the direct reaction of the [N 2O2]H2 ligands, 1a-6a, with Ti(O iPr)4 in 69-86% yield. The Royal Society of Chemistry 2010.
Titanium complexes containing new dianionic tetradentate [ONNO]-type ligands with benzyl substituents on bridging nitrogen atoms: Syntheses, X-ray structures, and catalytic activities in ring opening polymerization of lactide
Kim, So Han,Lee, Junseong,Kim, Da Jung,Moon, Jung Hee,Yoon, Sungwoo,Oh, Hyung Jin,Do, Youngkyu,Ko, Young Soo,Yim, Jin-Heong,Kim, Youngjo
experimental part, p. 3409 - 3417 (2010/02/16)
Several titanium isopropoxides 1-8 have been prepared by the reaction of Ti(O-i-Pr)4 with a series of corresponding tetradentate Salan-type [ONNO] ligands with benzyl or methyl substituents on bridging nitrogen atoms. They have been characteriz
Active non-metallocene pre-catalyst and method for tactic catalytic polymerization of alpha-olefin monomers
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Page column 27-28, (2010/02/05)
An active non-metallocene pre-catalyst featuring a diamine diphenolate complex and a corresponding method for catalytic polymerization, in general, and, tactic catalytic polymerization, in particular, of alpha-olefin monomers using the disclosed pre-catal
Remarkable Stereocontrol in the Polymerization of Racemic Lactide Using Aluminum Initiators Supported by Tetradentate Aminophenoxide Ligands
Hormnirun, Pimpa,Marshall, Edward L.,Gibson, Vernon C.,White, Andrew J. P.,Williams, David J.
, p. 2688 - 2689 (2007/10/03)
A new family of aluminum complexes bearing tetradentate bis(aminophenoxide) ligands is reported and shown to initiate the living ring-opening polymerization of rac-lactide. The microstructures of the polylactide products are found to be highly dependent upon the ancillary ligand substituents, ranging from highly isotactic (Pm = 0.79) to very highly heterotactic (Pr = 0.96). Copyright
Single-step synthesis of salans and substituted salans by Mannich condensation
Tshuva, Edit Y,Gendeziuk, Natalie,Kol, Moshe
, p. 6405 - 6407 (2007/10/03)
A convenient route for the synthesis of a variety of salan-type compounds is introduced. The synthesis is based on a single-step Mannich condensation between readily available starting materials: primary or secondary amines, formaldehyde and substituted phenols. This methodology is suitable for the preparation of chiral salans as well, which may find applications in asymmetric catalysis.
