Five‐coordinated active species in the stereoselective polymerization of rac‐lactide using N,N′‐(2,2‐dimethyl‐1,3‐propylene) bis(3,5‐di‐tert‐butyl‐salicylideneimine) aluminum complexes

Tang, Zhaohui; Pang, Xuan; Sun, Jingru; Du, Hongwang; Chen, Xuesi; Wang, Xianhong; Jing, Xiabin

doi:10.1002/pola.21578

Cited by 22 publications

(9 citation statements)

References 32 publications

(57 reference statements)

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“…Interestingly, Chen et al. have reached a different conclusion to us using an analogue of complex 8 : they concluded that the Al center does not coordinate to the oxygen atom of the acyl group in the ground state 12b…”

Section: Resultsmentioning

confidence: 99%

Exploration of Islamic medicine plant extracts as powerful antifungals for the prevention of mycotoxigenic Aspergilli growth in organic silage

Tayel

Salem

El‐Tras

et al. 2011

J. Sci. Food Agric.

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Section: Resultsmentioning

confidence: 99%

Exploration of Islamic medicine plant extracts as powerful antifungals for the prevention of mycotoxigenic Aspergilli growth in organic silage

Tayel

Salem

El‐Tras

et al. 2011

J. Sci. Food Agric.

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“…The major applications of 27 Al NMR spectroscopy in the area of polymer chemistry are related to the studies of the ring-opening polymerization mechanisms [12,[23][24][25][26][27][28]. Some limitations of this analytical tool are related to: quadrupolar character of the 27 Al nucleus that results in NMR lines broadening, extraneous probe head signal, and base-line rolling.…”

Section: Discussionmentioning

confidence: 99%

“…Ref. [18,19,[22][23][24][25][26][27][28][29]), in comparison to that reporting other aspects of application of aluminum derivatives in polymerization processes. Reasons of such situation are directly related to the specific features of the Al atom, including magnetic properties of the 27 Al nucleus.…”

mentioning

confidence: 99%

Application of the 27Al NMR spectroscopy to studies of mechanisms of cyclic esters polymerization

Florczak¹,

Kowalski²,

Libiszowski³

et al. 2007

Polimery

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On account of a vast use of the aluminum-containing initiators and catalysts for the polymer synthesis the applications of the 27 Al NMR spectroscopy to studies of the polymerization mechanisms is described. In the extensive introduction the specific features of Al atom, important with regard to the 27 Al NMR spectroscopy, are discussed. The latter include strong tendency of the organoaluminum compounds to aggregation and quadrupolar character of the 27 Al nucleus. Attention is also drawn to some pitfalls in the quantitative analysis of the 27 Al NMR spectra which result from an extraneous multinuclear probe head signal, base-line rolling, and the absorption bands broadening at lower temperatures. Finally, examples of application of the 27 Al NMR to determining the active centers structure in the ring-opening polymerization of ε-caprolactone (CL) and L,L-lactide (LA) initiated with dialkylaluminum alkoxides, aluminum tris-alkoxides or dialkylaluminum alkoxide/(S)-(+)-2,2'-[1,1'-binaphtyl-2,2'-diylbis-(nitrylmethilidyne)diphenol] [SB(OH)2] system are reported in more detail.

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“…On the other hand, there are five mononuclear Al structures bearing the FUW; Tang et al, 2006) Kan et al, 2016), where ligands L are dianionic salen-like tetradentate ligands, and Dagorne et al, 2007). The À O-CR 2 -COO-Alkyl ligand exhibits the O coordination mode in one case and the 2 -2 O,O 0 :O coordination mode in four of the five complexes.…”

Section: [(Bht)almementioning

confidence: 99%

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

et al. 2018

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A new packing polymorph of bis(2,6-di-tert-butyl-4-methylphenolato-κO)bis(tetrahydrofuran-κO)magnesium, [Mg(CHO)(CHO)] or Mg(BHT)(THF), (BHT is the 2,6-di-tert-butyl-4-methylphenoxide anion and THF is tetrahydrofuran), (1), has the same space group (P2) 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(μ-ethyl glycolato-κO,O':κO)dimethyldialuminium, [Al(CH)(CHO)(CHO)] or [(BHT)AlMe(OCHCOOEt)], (2), is a dimer located on an inversion centre and has an AlO rhomboid core. The 2-ethoxy-2-oxoethanolate ligand (OCHCOOEt) displays a μ-κO,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(μ-benzyloxo-κO:κO:κO)hexaethylheptazinc, [Zn(CH)(CHO)] or [Zn(OCHPh)Et], (3), possesses a bicubic ZnO 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 ℇ-caprolactone, and polymerization results are reported.

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Five‐coordinated active species in the stereoselective polymerization of rac‐lactide using N,N′‐(2,2‐dimethyl‐1,3‐propylene) bis(3,5‐di‐tert‐butyl‐salicylideneimine) aluminum complexes

Cited by 22 publications

References 32 publications

Exploration of Islamic medicine plant extracts as powerful antifungals for the prevention of mycotoxigenic Aspergilli growth in organic silage

Exploration of Islamic medicine plant extracts as powerful antifungals for the prevention of mycotoxigenic Aspergilli growth in organic silage

Application of the 27Al NMR spectroscopy to studies of mechanisms of cyclic esters polymerization

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

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