Ring Opening Polymerization of Lactide under Solvent-Free Conditions Catalyzed by a Chlorotitanium Calix[4]arene Complex

2008 ◽  
Vol 29 (18) ◽  
pp. 1554-1560 ◽  
Author(s):  
Marco Frediani ◽  
David Sémeril ◽  
Alfredo Mariotti ◽  
Luca Rosi ◽  
Piero Frediani ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Solvent Free ◽  
Solvent Free Conditions ◽  
Arene Complex

scholarly journals 1-n-Butyl-3-methylimidazolium-2-carboxylate: a versatile precatalyst for the ring-opening polymerization of ε-caprolactone and rac-lactide under solvent-free conditions

2013 ◽  
Vol 9 ◽  
pp. 647-654 ◽  
Author(s):  
Astrid Hoppe ◽  
Faten Sadaka ◽  
Claire-Hélène Brachais ◽  
Gilles Boni ◽  
Jean-Pierre Couvercelle ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ring Opening ◽  
Gel Permeation Chromatography ◽  
Ring Opening Polymerization ◽  
Solvent Free ◽  
Scanning Calorimetry ◽  
H Nmr ◽  
Solvent Free Conditions ◽  
Gel Permeation

The ring-opening polymerization of ε-caprolactone (ε-CL) and rac-lactide (rac-LA) under solvent-free conditions and using 1-n-butyl-3-methylimidazolium-2-carboxylate (BMIM-2-CO2) as precatalyst is described. Linear and star-branched polyesters were synthesized by successive use of benzyl alcohol, ethylene glycol, glycerol and pentaerythritol as initiator alcohols, and the products were fully characterized by 1H and 13C{1H} NMR spectroscopy, gel permeation chromatography (GPC), and differential scanning calorimetry (DSC). BMIM-2-CO2 acts as an N-heterocyclic carbene precursor, resulting from in situ decarboxylation, either by heating under vacuo (method A) or by addition of NaBPh4 (method B). Possible catalytic and deactivation mechanisms are proposed.

scholarly journals Ring opening polymerization of d,l-lactide and ε-caprolactone catalysed by (pyrazol-1-yl)copper(ii) carboxylate complexes

RSC Advances ◽  
2021 ◽  
Vol 11 (22) ◽  
pp. 13475-13485
Author(s):  
Divambal Appavoo ◽  
Lara C. Spencer ◽  
Ilia A. Guzei ◽  
Carlos J. Gómez-García ◽  
Juanita L. van Wyk ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Complete Characterization ◽  
Solvent Free ◽  
Carboxylate Complexes ◽  
Solvent Free Conditions

We report the synthesis, structure and complete characterization of four new pyrazolyl carboxylate-based copper(ii) complexes that catalyze the ring opening polymerization of ε-caprolactone under solvent-free conditions and of d,l-lactide in toluene.

scholarly journals Reactive Extrusion and Magnesium (II) N-Heterocyclic Carbene Catalyst in Continuous PLA Production

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1987
Author(s):  
Rosica Mincheva ◽  
Satya Narayana Murthy Chilla ◽  
Richard Todd ◽  
Brieuc Guillerm ◽  
Julien De Winter ◽  
...  
Keyword(s):  
Ring Opening ◽  
Continuous Production ◽  
Reactive Extrusion ◽  
Ring Opening Polymerization ◽  
Solvent Free ◽  
Molecular Weights ◽  
Solvent Free Conditions

Reactive extrusion and magnesium (II) N-heterocyclic carbene catalyst are successfully employed in continuous polylactide synthesis. The possibility of using six-membered N-heterocyclic carbene adducts to act as efficient catalysts towards the sustainable synthesis of poly(l-lactide) through ring-opening polymerization of l-lactide (LA) is first investigated in bulk batch reactions. Under optimized solvent-free conditions, polylactide (PLA) of moderate to high molecular weights and excellent optical activities are successfully achieved. These promising results are further applied in the continuous production of PLA in an extruder.

Fast and controlled ring-opening polymerization of δ-valerolactone catalyzed by benzoheterocyclic urea/MTBD catalysts

2020 ◽  
Vol 10 (22) ◽  
pp. 7555-7565
Author(s):  
Chenlin Ji ◽  
Suyun Jie ◽  
Pierre Braunstein ◽  
Bo-Geng Li
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Solvent Free ◽  
Highly Efficient ◽  
Solvent Free Conditions

New benzoheterocyclic urea/MTBD catalysts are highly efficient and controllable in the ring-opening polymerization of δ-valerolactone under solvent-free conditions or in solution.

Solid lithium perchlorate as a powerful catalyst for the synthesis of β-aminoalcohols under solvent-free conditions

2005 ◽  
Vol 83 (5) ◽  
pp. 505-507 ◽  
Author(s):  
Najmodin Azizi ◽  
Mohammad R Saidi
Keyword(s):  
Ring Opening ◽  
Room Temperature ◽  
Lithium Perchlorate ◽  
Solvent Free ◽  
Solvent Free Conditions ◽  
Reaction Proceeds ◽  
Ring Opening Of Epoxides ◽  
Neutral Conditions ◽  
Hindered Amines ◽  
Short Times

Lithium perchlorate catalyzed the ring opening of epoxides with amines to provide the corresponding β-aminoalcohols in excellent yields with high regioselectivity. The reaction proceeds rapidly under mild and neutral conditions and worked well with primary, secondary, aliphatic, aromatic, and hindered amines in short times at room temperature, in the absence of solvent.Key words: epoxide, lithium perchlorate, β-aminoalcohols, solvent-free.

Efficient method for ring opening of epoxides with amines by NaY zeolite under solvent-free conditions

2007 ◽  
Vol 264 (1-2) ◽  
pp. 162-169 ◽  
Author(s):  
Rukhsana Ilyas Kureshy ◽  
Surendra Singh ◽  
Noor-ul Hasan Khan ◽  
Sayed Hasan Razi Abdi ◽  
Eringathodi Suresh ◽  
...  
Keyword(s):  
Efficient Method ◽  
Ring Opening ◽  
Solvent Free ◽  
Nay Zeolite ◽  
Solvent Free Conditions ◽  
Ring Opening Of Epoxides

ChemInform Abstract: Thiourea Catalyzed Aminolysis of Epoxides under Solvent-Free Conditions. Electronic Control of Regioselective Ring Opening.

ChemInform ◽  
2010 ◽  
Vol 41 (33) ◽  
pp. no-no
Author(s):  
Swapandeep Singh Chimni ◽  
Neeraj Bala ◽  
Vaibhav A. Dixit ◽  
Prasad V. Bharatam
Keyword(s):  
Ring Opening ◽  
Solvent Free ◽  
Electronic Control ◽  
Solvent Free Conditions

Ring-Opening Polymerization of L-lactide Initiated by Samarium(III) Acetate

2019 ◽  
Vol 3 (2) ◽  
pp. 112-119
Author(s):  
Jesús Miguel Contreras Ramírez ◽  
Dimas Medina ◽  
Francisco López-Carrasquero ◽  
Ricardo Rafael Contreras
Keyword(s):  
1H Nmr ◽  
Ring Opening ◽  
Alkali Metals ◽  
Molar Mass ◽  
Ring Opening Polymerization ◽  
Solvent Free ◽  
Size Exclusion ◽  
Polymerization Process ◽  
Molar Ratio ◽  
Aliphatic Polyesters

Background: The synthesis of the aliphatic polyesters obtained by the ring opening polymerization has been achieved using as initiators a large amount of organometallic compounds derivative from: Alkali metals, alkaline earth metals, transition metals and lanthanide metals. Of all these compounds, the lanthanide derivatives have acquired great importance in the synthesis of aliphatic polyesters, since these show a greater catalytic activity and also can provide polymer with characteristics that will be very useful in the design of biomaterials. Objective: It was proposed the synthesis of poly(L-lactida) (PL-LA) through a ring opening polymerization process of L-lactide initiated with samarium(III) acetate (Sm(OAc)3) under solvent-free melt conditions. The influence of different parameters of reaction, such as temperature, time, molar ratio monomer to initiator, on typical variables of polymers, e.g., conversion, dispersity, and molar mass, were analyzed. Methods: All polymerizations were carried out under solvent-free melt conditions in ampoules-like flasks, equipped with a magnetic stirrer. The obtained polyesters were characterized by size exclusion chromatography (SEC) and 1H-NMR. Results: The Sm(OAc)3 induces the polymerization of L-LA at high conversion, and produce polyesters with number-average molecular weights of 1.00 x 103 to 30.00 x 103 Dalton. The 1H-NMR analysis indicates a typical polymerization mechanism of coordination-insertion, with a breakdown of the acyl-oxygen bond of the L-LA. Conclusion: Sm(OAc)3 was an effective initiator for the ring-opening polymerization of L-LA. SEC chromatography showed that, at high temperatures and prolonged reaction times, the molar mass of the polyester decreases, which is associated with the transesterification collateral reactions that occur during the polymerization process.

Organotin-bridged ionic liquid as a solvent-free, leaching-resistive catalyst for ring opening polymerization of ε-caprolactone

2019 ◽  
Vol 43 (15) ◽  
pp. 5872-5878 ◽  
Author(s):  
Asmaa Bouyahya ◽  
Sébastien Balieu ◽  
Redouane Beniazza ◽  
Mustapha Raihane ◽  
Abdelkrim El Kadib ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Solvent Free ◽  
Biologically Relevant ◽  
The Way

An easy synthesis provides a monoalkyltin trichloride grafted onto an ionic liquid. The catalyst paves the way to nontoxic biologically relevant materials.

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