l-lactide polymerization – living and controlled – catalyzed by initiators: Hydroxyalkylated organic bases
Sign Up to like & getrecommendations! Published in 2017 at "Polymer"
DOI: 10.1016/j.polymer.2016.11.070
Abstract: Abstract Polymerizations of l -lactide (LA) were initiated with hydroxyalkylated strong organic bases functioning simultaneously as catalysts (INICATs). Organocatalysts used until now in Ring-Opening Polymerization, particularly of l -lactide, had to be combined with separately… read more here.
Keywords: organic bases; lactide polymerization; polymerization; polymerization living ... See more keywords
N-heterocyclic ligand optimization for aluminum complexes in ε-caprolactone and L-Lactide polymerization
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DOI: 10.1016/j.polymer.2020.122572
Abstract: Abstract A series of aluminum complexes bearing heterocyclic amine ligands were synthesized, and their application in e-caprolactone (CL) and L-Lactide (LA) polymerization and copolymerization were studied. The CL polymerization results revealed that ligands containing the… read more here.
Keywords: lactide polymerization; polymerization; caprolactone lactide; aluminum complexes ... See more keywords
Stopped-Flow NMR and Quantitative GPC Reveal Unexpected Complexities for the Mechanism of NHC-Catalyzed Lactide Polymerization
Sign Up to like & getrecommendations! Published in 2017 at "Macromolecules"
DOI: 10.1021/acs.macromol.6b02139
Abstract: Stopped-flow NMR spectroscopy provides the first direct, in situ observation of lactide epimerization during polymerization with the N-heterocyclic carbene organocatalyst 1,3-dimesitylimidazol-2-ylidene (IMes). Hexad analysis of the polymer microstructure using 13C NMR spectroscopy supports a chain-end-controlled… read more here.
Keywords: lactide polymerization; polymerization; stopped flow; mechanism ... See more keywords
Stereoselective Lactide Polymerization: the Challenge of Chiral Catalyst Recognition
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DOI: 10.1021/acscatal.9b05109
Abstract: A model for stereoselective ring opening polymerization (ROP) of rac-lactide promoted by chiral aluminum systems is reported based on DFT calculations. The mechanism of enantiomorphic site control ... read more here.
Keywords: lactide polymerization; polymerization; polymerization challenge; challenge chiral ... See more keywords
Calixarene-Metal Complexes in Lactide Polymerization: The Story so Far
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DOI: 10.1021/acsomega.2c08028
Abstract: Polylactide synthetic procedures have lately gained attention, possibly due to their biocompatibility and the environmental problems associated with fossil-fuel-based polymers. Polylactides can be obtained from natural sources such as cassava, corn, and sugar beet, and… read more here.
Keywords: lactide polymerization; metal complexes; complexes lactide; calixarene metal ... 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
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