Lewis acid/base modulation in β-diiminate zinc-catalyzed switchable ring-opening polymerization of rac-lactide
Sign Up to like & getrecommendations! Published in 2019 at "Science China Chemistry"
DOI: 10.1007/s11426-018-9414-3
Abstract: Two β-diiminate zinc complexes were prepared and found to show high activity and well-controlled catalytic behavior in the ring-opening polymerization of rac-lactide. Coordination of the Lewis acid to the zinc complexes completely terminated the polymerization.… read more here.
Keywords: ring opening; lewis acid; polymerization; rac lactide ... See more keywords
Zinc and aluminum complexes of chiral ligands: Synthesis, characterization and application to rac-lactide polymerization
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Organometallic Chemistry"
DOI: 10.1016/j.jorganchem.2016.12.031
Abstract: Abstract The crystalline complexes L2Zn (1), L3Al (2), L′2Zn (3) and L'AlMe2 (4) were synthesized from the reactions of the corresponding chiral ligands (S) N-(2-pyrrolylmethylene)-1-phenylethylamine (HL) or (S) N-(2-pyrrolylmethyl)-1-phenylethanamine (HL′) and diethylzinc or trimethylaluminum, respectively.… read more here.
Keywords: rac lactide; polymerization; aluminum complexes; chiral ligands ... See more keywords
Mechanism of the Polymerization of rac-Lactide by Fast Zinc Alkoxide Catalysts.
Sign Up to like & getrecommendations! Published in 2017 at "Inorganic chemistry"
DOI: 10.1021/acs.inorgchem.7b02544
Abstract: The ring-opening transesterification polymerization (ROTEP) of rac-lactide (rac-LA) using LXZn catalysts (LX = ligand having phenolate, amine, and pyridine donors with variable para substituents X on the bound phenolate donor; X = NO2, Br, t-Bu,… read more here.
Keywords: mechanism polymerization; rac lactide; polymerization; alkoxide ... See more keywords
Mononuclear Salen-Sodium Ion Pairs as Catalysts for Isoselective Polymerization of rac-Lactide.
Sign Up to like & getrecommendations! Published in 2019 at "Inorganic chemistry"
DOI: 10.1021/acs.inorgchem.8b02290
Abstract: A series of mononuclear salen-sodium anions, as the first examples, were synthesized with tetra-alkyl ammonium as a counterpart cation. These complexes are efficient catalysts for the isoselective ring-opening polymerization of rac-lactide; the molecular weights of… read more here.
Keywords: rac lactide; catalysts isoselective; mononuclear salen; polymerization rac ... See more keywords
Exploiting Noncovalent Interactions for Room-Temperature Heteroselective rac-Lactide Polymerization Using Aluminum Catalysts
Sign Up to like & getrecommendations! Published in 2019 at "ACS Catalysis"
DOI: 10.1021/acscatal.9b00875
Abstract: Whereas harnessing noncovalent interactions (NCIs) has largely been applied to late-transition-metal complexes and to the corresponding catalytic reactions, there are very few examples showing the importance of NCIs in early-transition-metal and main-group-metal catalysis. Here, we… read more here.
Keywords: noncovalent interactions; exploiting noncovalent; aluminum; interactions room ... See more keywords
Isoselective mechanism of the ring-opening polymerization of rac-lactide catalyzed by chiral potassium binolates
Sign Up to like & getrecommendations! Published in 2017 at "Inorganic chemistry frontiers"
DOI: 10.1039/c6qi00449k
Abstract: In this work, two enantiopure potassium complexes were synthesized and characterized. These two complexes show good isoselectivity for the ring-opening polymerization (ROP) of rac-lactide (Pm = 0.80 at room temperature for complex 1 and Pm… read more here.
Keywords: rac lactide; ring opening; potassium; mechanism ... See more keywords
Highly thermally stable and robust enantiopure zirconium NNN-scorpionates for the controlled ring-opening polymerization of rac-lactide.
Sign Up to like & getrecommendations! Published in 2017 at "Dalton transactions"
DOI: 10.1039/c7dt01050h
Abstract: A series of enantiopure alkoxide and thioalkoxide zirconium derivatives [Zr(ER)3(κ3-R,R-fbpza)] (1-6) (E = O, R = CHMe21, CHMeEt 2, CH2SiMe33, 2,6-C6H3Me24, 4-tBuPh 5; E = S, R = 4-tBuPh 6) has been prepared for use… read more here.
Keywords: rac lactide; ring opening; thermally stable; controlled ring ... See more keywords
Configurationally flexible zinc complexes as catalysts for rac-lactide polymerisation.
Sign Up to like & getrecommendations! Published in 2018 at "Dalton transactions"
DOI: 10.1039/c8dt02562b
Abstract: Zn(N(SiMe3)2)2 was reacted with pyridinemethanol and R,R-N,N'-di(methylbenzyl)-2,5-diiminopyrrole (L1H) to afford the dimeric complex (L1)2Zn2(μ-OR)2. The complex showed moderate activity in rac-lactide polymerization to heterotactic polymer (Pr = 0.75). 2,4-Di-tert-butyl-6-aminomethyl-phenol ligands with amino = N,N,N',N'-tetramethyldiethylenetriamine (L2H)… read more here.
Keywords: lactide polymerization; rac lactide; znoet; flexible zinc ... See more keywords
Highly Selective Polymerization of Rac-Lactide Initiated by Salen Aluminum Complex Bearing an Adamantane Derivative
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DOI: 10.1080/00958972.2021.1918683
Abstract: Abstract Using adamantane-1,3-diamine and 3,5-di-tert-butylsalicylic aldehyde as raw materials, the generated salen aluminum complex was characterized by 1H, 13C NMR spectroscopy and elemental analysis. After isopropyl alcohol activation treatment, the complex has good activity (70.3-95.6%),… read more here.
Keywords: salen aluminum; rac lactide; highly selective; aluminum complex ... See more keywords
Replacing sulfonate by carboxylate: application of pyridyliminocarboxylato copper(II) complexes in rac-lactide polymerization and Chan–Evans–Lam coupling
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DOI: 10.1139/cjc-2018-0402
Abstract: Copper(II) complexes carrying pyridylmethyleneaminobenzoate or –propanoate ligands, LCuX, were prepared in one-pot reactions from pyridinecarboxaldehyde, aminobenzoic acid or β-alanine, and CuX2 (X = Cl, NO3, OAc, or OTf). All complexes were characterized by single-crystal X-ray… read more here.
Keywords: copper complexes; chan evans; lactide polymerization; polymerization ... See more keywords