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
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
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
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.
