New Aryloxy and Benzyloxy Derivatives of Titanium as Catalysts for Bulk Ring-Opening Polymerization of ϵ-Caprolactone and δ-Valerolactone

2009 ◽  
Vol 2009 (20) ◽  
pp. 2981-2993 ◽  
Author(s):  
Ravikumar R. Gowda ◽  
Debashis Chakraborty ◽  
Venkatachalam Ramkumar
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Derivatives Of

Hepta-coordinated heteroleptic derivatives of zirconium(IV): Synthesis, structural characterization and ring opening polymerization of ε-caprolactone

Polyhedron ◽  
2016 ◽  
Vol 107 ◽  
pp. 163-171 ◽  
Author(s):  
Giri Prasanth Vuppalapati ◽  
Ravindranath S. Rathore ◽  
Madhvesh Pathak ◽  
Sathiyanarayanan Kulathu Iyer
Keyword(s):  
Structural Characterization ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Derivatives Of

Further investigation of the ring-opening polymerization of propylene oxide. Catecholate derivatives of Zn(II) and Al(III)

Polyhedron ◽  
2003 ◽  
Vol 22 (4) ◽  
pp. 557-561 ◽  
Author(s):  
Malcolm H Chisholm ◽  
Judith Gallucci ◽  
Diana Navarro-Llobet ◽  
Hongshi Zhen
Keyword(s):  
Propylene Oxide ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Derivatives Of

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.

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