Highly active and selective Zn(II)-NN′O Schiff base catalysts for the cycloaddition of CO 2 to epoxides

Cuesta-Aluja, Laia; Campos-Carrasco, Ariadna; Castilla, Javier; Reguero, Mar; Masdeu‐Bultó, Anna M.; Aghmiz, Ali

doi:10.1016/j.jcou.2016.01.002

Cited by 40 publications

(15 citation statements)

References 75 publications

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“…This has previously been observed and attributed to a ligand oxidation process. 63 The resultant molecular weight of solution polymerisations with BnOH co-initiator demonstrates a reasonable correlation with the predicted value. However, the molecular weight achieved by Mg(2) 2 , is much lower than anticipated.…”

Section: Polymerisation Studiessupporting

confidence: 61%

“…The pyridine based ligand, 3H, has previously been complexed with Zn(II) and therefore was only complexed to Mg(II). 63,64 Despite a 1 : 1 ligand-to-metal stoichiometry, only the homoleptic complexes, M(1-3) 2 were isolable from reaction with the metal alkyl species. X-ray crystallographic analysis revealed a pseudo octahedral complex for M(1) 2 {M = Mg(II) or Zn(II)} (Fig.…”

Section: Monophenolate Complexesmentioning

confidence: 99%

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Ligands and complexes based on piperidine and their exploitation of the ring opening polymerisation of rac-lactide

et al. 2017

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A range of ligands based upon 2-(aminomethyl)piperidine have been successfully complexed to Mg(ii), Zn(ii) and group IV metal centres. These complexes have been characterised both in solution and solid state with different coordination geometries realised dependant on the nature of the ligand. For the Mg(ii) and Zn(ii) complexes, M(1-2), were isolated and analysed by DOSY NMR spectroscopy. These ligands also furnished diastereomeric group IV complexes, M(1-2)(OPr). Group IV salalen and salan complexes, M(4-5)(OR) were also found to be diastereomeric in nature, with either β-cis or α-cis geometriesrespectively. The tridentate ligand, 6H, yielded five coordinate complexes with both Ti(iv) and Zr(iv). All complexes were screened for the ring opening polymerisation of rac-lactide under both solvent and melt conditions. For the Mg(ii) and Zn(ii) complexes, good activity was observed with Zn(1-2) demonstrating immortal polymerisation characteristics.

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Section: Polymerisation Studiessupporting

confidence: 61%

Section: Monophenolate Complexesmentioning

confidence: 99%

Ligands and complexes based on piperidine and their exploitation of the ring opening polymerisation of rac-lactide

et al. 2017

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“…5,38 The traditional method of synthesis includes the use of toxic phosgene. [38][39][40][41] A sustainable alternative is using CO 2 as a renewable, non-toxic, abundant, cheap, 'waste' material and C 1 -synthon building block. Coupling this thermodynamically stable molecule with reactive epoxides enables the formation of either COCs and/or aliphatic polycarbonates (APCs) depending on the catalyst/cocatalyst system and reaction conditions employed which determines the selectivity and activity.…”

Section: Introductionmentioning

confidence: 99%

The synthesis, characterisation and application of iron(iii)–acetate complexes for cyclic carbonate formation and the polymerisation of lactide

et al. 2019

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“…The higher activity of 2/ TBAB may be related with its more flexible structure, which may favour the dissociation of the pyridine fragment to allow the epoxide coordination. The activity of 2 /TBAB is also higher than the one obtained with the previously reported catalytic system [Zn( 1 ) 2 ] . All these complexes are very selective to the cyclic carbonate versus the polycarbonate.…”

Section: Resultsmentioning

confidence: 97%

Iron(III) Versatile Catalysts for Cycloaddition of CO₂ to Epoxides and Epoxidation of Alkenes

Cuesta-Aluja¹,

Masdeu‐Bultó²

2016

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Fe(III) complexes with tridentate pyridine-imine-phenolato ligands differing in the chain length between the imine and pyridine groups (2-methylpyridine L1 and 2-ethylpyridine L2) have been synthesized. New complex [Fe(L2) 2 ]ClO 4 (2) was characterized by X-ray diffraction and spectroscopic techniques.[Fe(L1) 2 ]ClO 4 (1) and 2 form active catalysts for the cycloaddition of CO 2 to epoxides and for the epoxidation of alkenes. Catalytic systems with the more flexible skeleton (2) in combination with tetrabutylammonium bromide (TBAB) were more active than 1/TBAB in the cycloaddition of CO 2 to epoxides. TOFs up to 900 h À1 for the selective synthesis of styrene carbonate and 3640 h À1 for the synthesis of glycidol carbonate were obtained using 2/TBAB at low catalyst loadings (0.025 mol %). Additionally, 2 was also active in the epoxidation of styrene derivatives such as trans-stilbene (conversion 88 %) and trans-bmethylstyrene (conversion 100 %) using tert-butylhydroperoxide as oxidant at 60 8C in acetonitrile. Epoxidation of styrene and cyclohexene proceed at low conversions.[a] Dr.

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Highly active and selective Zn(II)-NN′O Schiff base catalysts for the cycloaddition of CO 2 to epoxides

Cited by 40 publications

References 75 publications

Ligands and complexes based on piperidine and their exploitation of the ring opening polymerisation of rac-lactide

Ligands and complexes based on piperidine and their exploitation of the ring opening polymerisation of rac-lactide

The synthesis, characterisation and application of iron(iii)–acetate complexes for cyclic carbonate formation and the polymerisation of lactide

Iron(III) Versatile Catalysts for Cycloaddition of CO₂ to Epoxides and Epoxidation of Alkenes

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Highly active and selective Zn(II)-NN′O Schiff base catalysts for the cycloaddition of CO 2 to epoxides

Cited by 40 publications

References 75 publications

Ligands and complexes based on piperidine and their exploitation of the ring opening polymerisation of rac-lactide

Ligands and complexes based on piperidine and their exploitation of the ring opening polymerisation of rac-lactide

The synthesis, characterisation and application of iron(iii)–acetate complexes for cyclic carbonate formation and the polymerisation of lactide

Iron(III) Versatile Catalysts for Cycloaddition of CO2 to Epoxides and Epoxidation of Alkenes

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Iron(III) Versatile Catalysts for Cycloaddition of CO₂ to Epoxides and Epoxidation of Alkenes