Synthesis and ring-opening polymerization of 2-substituted 1,3-benzoxazine: the first observation of the polymerization of oxazine ring-substituted benzoxazines

2016 ◽  
Vol 7 (46) ◽  
pp. 7177-7184 ◽  
Author(s):  
Seishi Ohashi ◽  
Francis Cassidy ◽  
Stephanie Huang ◽  
Kevin Chiou ◽  
Hatsuo Ishida
Keyword(s):  
Ring Opening ◽  
Phenyl Group ◽  
Ring Opening Polymerization ◽  
Ring Substituent ◽  
Oxazine Ring

2-Substituted 1,3-benzoxazines having a phenyl group as an oxazine ring substituent are synthesized with benzaldehyde through 2-hydroxy-N-phenylbenzylamine structures.

Effect of the phenyl ring substituent on stereoselectivity in the ring-opening polymerization of the rac-lactide initiated by salen aluminum complexes

2015 ◽  
Vol 293 (12) ◽  
pp. 3449-3457 ◽  
Author(s):  
Zuwang Wen ◽  
Dongni Li ◽  
Juquan Qi ◽  
Xuedi Chen ◽  
Yue Jiang ◽  
...  
Keyword(s):  
Phenyl Ring ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Ring Substituent ◽  
Aluminum Complexes ◽  
Salen Aluminum

Organocatalytic Ring-Opening Polymerization Strategies for Synthesis of Poly(phosphothioesters) with a Pendent Phenyl Group

Synlett ◽  
2020 ◽  
Vol 31 (12) ◽  
pp. 1167-1171 ◽  
Author(s):  
Guangqiang Xu ◽  
Xin-Qi Hao ◽  
Qinggang Wang ◽  
Huating Yan ◽  
Rulin Yang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Weight Distribution ◽  
Ring Opening ◽  
Diblock Copolymers ◽  
Phenyl Group ◽  
Ring Opening Polymerization ◽  
Polymerization Process ◽  
Narrow Molecular Weight Distribution ◽  
Living Nature

A novel type of phosphothioester substrate, 2-phenyl-1,3,2-dioxaphospholane 2-sulfide (PTP), has been synthesized and subjected to ring-opening polymerization. DBU/thiourea served as an efficient cooperative organocatalyst for the synthesis of poly(PTP), delivering the polymer with a well-defined structure, a relatively narrow molecular-weight distribution (1.14–1.20), and high molecular weight (up to 45.2 kg/mol). The ring-opening polymerization process showed a controlled/living nature. In addition, diblock copolymers of PTP with rac-lactide with well-defined structures were also synthesized.

Phenoxide and alkoxide complexes of Mg, Al and Zn, and their use for the ring-opening polymerization of ∊-caprolactone with initiators of different natures

2018 ◽  
Vol 74 (5) ◽  
pp. 548-557 ◽  
Author(s):  
Mikhail E. Minyaev ◽  
Ilya E. Nifant'ev ◽  
Andrey V. Shlyakhtin ◽  
Pavel V. Ivchenko ◽  
Konstantin A. Lyssenko
Keyword(s):  
Ring Opening ◽  
Coordination Mode ◽  
Phenyl Group ◽  
Ring Opening Polymerization ◽  
Dalton Trans ◽  
Methyl Group ◽  
Positional Disorder ◽  
Structural Database ◽  
Independent Molecules ◽  
Derivatives Of

A new packing polymorph of bis(2,6-di-tert-butyl-4-methylphenolato-κO)bis(tetrahydrofuran-κO)magnesium, [Mg(C15H23O)2(C4H8O)2] or Mg(BHT)2(THF)2, (BHT is the 2,6-di-tert-butyl-4-methylphenoxide anion and THF is tetrahydrofuran), (1), has the same space group (P21) as the previously reported modification [Nifant'ev et al. (2017d). Dalton Trans. 46, 12132–12146], but contains three crystallographically independent molecules instead of one. The structure of (1) exhibits rotational disorder of the tert-butyl groups and positional disorder of a THF ligand. The complex of bis(2,6-di-tert-butyl-4-methylphenolato-κO)bis(μ2-ethyl glycolato-κ2 O,O′:κO)dimethyldialuminium, [Al2(CH3)2(C4H7O3)2(C15H23O)2] or [(BHT)AlMe(OCH2COOEt)]2, (2), is a dimer located on an inversion centre and has an Al2O2 rhomboid core. The 2-ethoxy-2-oxoethanolate ligand (OCH2COOEt) displays a μ2-κ2 O,O′:κO semi-bridging coordination mode, forming a five-membered heteronuclear Al–O–C–C–O ring. The same ligand exhibits positional disorder of the terminal methyl group. The redetermined structure of the heptanuclear complex octakis(μ3-benzyloxo-κO:κO:κO)hexaethylheptazinc, [Zn7(C2H5)6(C7H7O)8] or [Zn7(OCH2Ph)8Et6], (3), possesses a bicubic Zn7O8 core located at an inversion centre and demonstrates positional disorder of one crystallographically independent phenyl group. Cambridge Structural Database surveys are given for complexes structurally analogous to (2) and (3). Complexes (2) and (3), as well as derivatives of (1), are of interest as catalysts for the ring-opening polymerization of ∊-caprolactone, and polymerization results are reported.

A Recommender System for Inverse Design of Polycarbonates and Polyesters

2020 ◽  
Author(s):  
Nathaniel Park ◽  
Dmitry Yu. Zubarev ◽  
James L. Hedrick ◽  
Vivien Kiyek ◽  
Christiaan Corbet ◽  
...  
Keyword(s):  
Ring Opening ◽  
High Performance ◽  
Recommendation System ◽  
Polymeric Materials ◽  
Monomer Conversion ◽  
Design Strategy ◽  
Ring Opening Polymerization ◽  
Inverse Design ◽  
False Negatives ◽  
Accelerate Development

The convergence of artificial intelligence and machine learning with material science holds significant promise to rapidly accelerate development timelines of new high-performance polymeric materials. Within this context, we report an inverse design strategy for polycarbonate and polyester discovery based on a recommendation system that proposes polymerization experiments that are likely to produce materials with targeted properties. Following recommendations of the system driven by the historical ring-opening polymerization results, we carried out experiments targeting specific ranges of monomer conversion and dispersity of the polymers obtained from cyclic lactones and carbonates. The results of the experiments were in close agreement with the recommendation targets with few false negatives or positives obtained for each class.<br>

Bisurea and Bisthiourea H-Bonding Organocatalysts for Ring-Opening Polymerization: Cues for the Catalyst Design

2019 ◽  
Vol 52 (23) ◽  
pp. 9232-9237 ◽  
Author(s):  
Rukshika S. Hewawasam ◽  
U. L. D. Inush Kalana ◽  
Nayanthara U. Dharmaratne ◽  
Thomas J. Wright ◽  
Timothy J. Bannin ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Catalyst Design

Ring-opening polymerization of [2]ferrocenophanes with a hydrocarbon bridge: synthesis of poly(ferrocenylethylenes)

1993 ◽  
Vol 115 (15) ◽  
pp. 7035-7036 ◽  
Author(s):  
James M. Nelson ◽  
Heiko Rengel ◽  
Ian Manners
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization

scholarly journals Isoselective Ring-opening Polymerization of Racemic Lactide Catalyzed by N-heterocyclic Olefin/(Thio)urea Organocatalysts

2021 ◽  
Author(s):  
Zhen-Yu Wang ◽  
Guang-Qiang Xu ◽  
Li Zhou ◽  
Cheng-Dong Lv ◽  
Ru-Lin Yang ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization
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