Ring-Opening Copolymerization Using Simple Fe(III) Complexes and Metal- and Halide-Free Organic Catalysts

2021 ◽  
Vol 54 (18) ◽  
pp. 8443-8452
Author(s):  
Oliver J. Driscoll ◽  
Jack A. Stewart ◽  
Paul McKeown ◽  
Matthew D. Jones
Keyword(s):  
Ring Opening ◽  
Organic Catalysts

scholarly journals Microwave energy assisted synthesis of poly lactic acid via continuous reactive extrusion: modelling of reaction kinetics

RSC Advances ◽  
2017 ◽  
Vol 7 (30) ◽  
pp. 18529-18538 ◽  
Author(s):  
Satya P. Dubey ◽  
Hrushikesh A. Abhyankar ◽  
Veronica Marchante ◽  
James L. Brighton ◽  
Björn Bergmann ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Reaction Kinetics ◽  
Ring Opening ◽  
Bimetallic Catalyst ◽  
Batch Process ◽  
Reactive Extrusion ◽  
Ring Opening Polymerization ◽  
Microwave Energy ◽  
Poly Lactic Acid ◽  
Organic Catalysts

The most commonly used batch process to manufacture PLA is ring opening polymerization (ROP) of lactide monomer in a suitable solvent, in the presence of a metallic/bimetallic catalyst (Sn, Zn, and Al) or other organic catalysts.

Phosphines: Nucleophilic organic catalysts for the controlled ring-opening polymerization of lactides

2002 ◽  
Vol 40 (7) ◽  
pp. 844-851 ◽  
Author(s):  
Matthew Myers ◽  
Eric F. Connor ◽  
Thierry Glauser ◽  
Andreas Möck ◽  
Gregory Nyce ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Organic Catalysts

Development of Amino-Oxazoline and Amino-Thiazoline Organic Catalysts for the Ring-Opening Polymerisation of Lactide

2010 ◽  
Vol 16 (20) ◽  
pp. 6099-6105 ◽  
Author(s):  
Jan M. Becker ◽  
Sarah Tempelaar ◽  
Matthew J. Stanford ◽  
Ryan J. Pounder ◽  
James A. Covington ◽  
...  
Keyword(s):  
Ring Opening ◽  
Organic Catalysts

Amino-functional polyethers: versatile, stimuli-responsive polymers

2020 ◽  
Vol 11 (24) ◽  
pp. 3940-3950 ◽  
Author(s):  
Patrick Verkoyen ◽  
Holger Frey
Keyword(s):  
Ring Opening ◽  
Review Article ◽  
Stimuli Responsive ◽  
New Class ◽  
Stimuli Responsive Polymers ◽  
Responsive Polymers

Amino-functional polyethers have emerged as a new class of “smart”, i.e. pH- and thermoresponsive materials. This review article summarizes the synthesis and applications of these materials, obtained from ring-opening of suitable epoxide monomers.

Reversible Oxidative-Addition and Reductive-Elimination of Thiophene from a Titanium Complex and Its Thermally-Induced Hydrodesulfurization Chemistry

2019 ◽  
Author(s):  
Alejandra Gomez-Torres ◽  
J. Rolando Aguilar-Calderón ◽  
Carlos Saucedo ◽  
Aldo Jordan ◽  
Alejandro J. Metta-Magaña ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Ring Opening ◽  
Thiophene Ring ◽  
Oxidative Addition ◽  
Reductive Elimination ◽  
Thermally Induced ◽  
Titanium Complex

<p>The masked Ti(II) synthon (<sup>Ket</sup>guan)(<i>η</i><sup>6</sup>-Im<sup>Dipp</sup>N)Ti (<b>1</b>) oxidatively adds across thiophene to give ring-opened (<sup>Ket</sup>guan)(Im<sup>Dipp</sup>N)Ti[<i>κ</i><sup>2</sup>-<i>S</i>(CH)<sub>3</sub><i>C</i>H] (<b>2</b>). Complex <b>2</b> is photosensitive, and upon exposure to light, reductively eliminates thiophene to regenerate <b>1</b> – a rare example of early-metal mediated oxidative-addition/reductive-elimination chemistry. DFT calculations indicate strong titanium π-backdonation to the thiophene π*-orbitals leads to the observed thiophene ring opening across titanium, while a proposed photoinduced LMCT promotes the reverse thiophene elimination from <b>2</b>. Finally, pressurizing solutions of <b>2 </b>with H<sub>2</sub> (150 psi) at 80 °C leads to the hydrodesulfurization of thiophene to give the Ti(IV) sulfide (<sup>Ket</sup>guan)(Im<sup>Dipp</sup>N)Ti(S) (<b>3</b>) and butane. </p>

Visible Light-Promoted Catalytic Ring-Opening Isomerization of 1,2-Disubstituted Cyclopropanols to Linear Ketones

2019 ◽  
Author(s):  
Marharyta V. Laktsevich-Iskryk ◽  
Nastassia A. Varabyeva ◽  
Volha V. Kazlova ◽  
Vladimir N. Zhabinskii ◽  
Vladimir A. Khripach ◽  
...  
Keyword(s):  
Visible Light ◽  
Functional Groups ◽  
Ring Opening ◽  
Radical Intermediates ◽  
Reaction Proceeds

In this article, we report a photocatalytic protocol for the isomerization of 1,2-disubstituted cyclopropanols to linear ketones. The reaction proceeds <i>via</i> radical intermediates and tolerates various functional groups.

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