Results 31 to 40 of about 74,434 (294)
Use of metal catalysts bearing Schiff base macrocycles for the ring opening polymerization (ROP) of cyclic esters [PDF]
, 2017 © 2017 by the authors. Schiff base macrocycles are emerging as useful scaffolds for binding two or more catalytic metals in close proximity. Such coordination chemistry allows for the evaluation of potentially beneficial catalytic cooperative effects. In
Redshaw, Carl
core +6 more sources
Dialkylaluminium 2-imidazolylphenolates: Synthesis, characterization and ring-opening polymerization behavior towards lactides [PDF]
, 2013 The stoichiometric reaction of the 2-imidazolylphenols (L1–L9) with the trialkylaluminium reagents AlR₃ (R = Me, Et and iBu), afforded the corresponding dialkylaluminium 2-imidazolylphenolate complexes [R₂Al(L1–L9)] (C1–C11), which were characterized by ...
Redshaw, Carl +4 more
core +1 more source
Ring-Opening Polymerization [PDF]
, 2013 Polymers can be synthesized by polymerizing monomers with ring structure as shown in Table 11.1. The polymerization of these compounds has some aspects of both chain and step polymerizations as far as kinetics and mechanisms are concerned. Table 11.1 Examples of polymers prepared by ring-opening polymerization [1] Polymer type ...
openaire +2 more sources
Developing New Methods for the Mono-end Functionalization of Living Ring Opening Metathesis Polymers
CHIMIA, 2012 In this article we present a review of our recent results in one area of research we are involved in. All research efforts in our group focus on functional polymers and new ways of gaining higher levels of control with regard to the placement of
Andreas F. M. Kilbinger
doaj +1 more source
Ring-Opening Polymerization of Hemoglobin [PDF]
Biomacromolecules, 2019 Hemoglobin (Hb), an oxygen-carrying protein, has an α2β2 tetrameric structure that dissociates reversibly into two αβ dimers (α2β2 ⇄ 2αβ). We synthesized a cyclic Hb-ring monomer with two β subunits bound through a 10 kDa polyethylene glycol (PEG) chain.
Takashi Matsuhira +2 more
openaire +3 more sources
Highly Active Water-Soluble Olefin Metathesis Catalyst [PDF]
, 2006 A novel water-soluble ruthenium olefin metathesis catalyst supported by a poly(ethylene glycol) conjugated saturated 1,3-dimesityl-4,5-dihydroimidazol-2-ylidene ligand is reported.
Grubbs, Robert H., Hong, Soon Hyeok
core +1 more source
Organic Materials, 2021 Poly(α-hydroxy acids), as a family of biodegradable polyesters, are valuable materials due to their broad applications in packaging, agriculture, and biomedical engineering.
Xiaoqian Wang, Ai Lin Chin, Rong Tong
doaj +1 more source
Stereo block copolymers of L- and D-lactides [PDF]
, 1990 Sequential diblock copolymers composed of L- and D-lactic acid residues were synthesized through a living ring-opening polymerization of L- and D-lactide initiated by aluminium tris(2-propanolate).
Dijkstra, Pieter J. +2 more
core +3 more sources
Organocatalyzed chemoselective ring-opening polymerizations [PDF]
Scientific Reports, 2018 AbstractA novel metal-free and protecting-group-free synthesis method to prepare telechelic thiol-functionalized polyesters is developed by employing organocatalysis. A scope of Brønsted acids, including trifluoromethanesulfonic acid (1), HCl.Et2O (2), diphenyl phosphate (3), γ-resorcylic acid (4) and methanesulfonic acid (5), are evaluated to promote ...
Ning Zhu +7 more
openaire +2 more sources
Synthesis of Highly Cis, Syndiotactic Polymers via Ring-Opening Metathesis Polymerization Using Ruthenium Metathesis Catalysts [PDF]
, 2013 The first example of ruthenium-mediated ring-opening metathesis polymerization generating highly cis, highly tactic polymers is reported. While the cis content varied from 62 to >95% depending on the monomer structure, many of the polymers ...
Grubbs, Robert H. +3 more
core +2 more sources