New insights into the lactide polymerisation with neutral N-donor stabilised zinc complexes: Comparison of imidazolin-2-imine vs. guanidine complexes

Börner, Janna; Flörke, Ülrich; Glöge, Thomas; Bannenberg, Thomas; Tamm, Matthias; Jones, Matthew D.; Döring, Artjom; Kuckling, Dirk; Herres‐Pawlis, Sonja

doi:10.1016/j.molcata.2009.10.012

Cited by 58 publications

(32 citation statements)

References 36 publications

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“…The polymer can be manufactured to plastics similar to conventional materials such as poly(ethylene terephthalate) (PET) or poly(propylene) (PP) [135][136][137]. These excellent properties raise the interest in new ecologically friendly catalysts for polylactide synthesis.…”

Section: Ring-opening Polymerisation (Rop) Of Lactide With Zinc Guanimentioning

confidence: 99%

“…After use, PLA can be either recycled, combusted or composted. Thus, the CO 2 emission in relation to the starting materials is neutral [136][137][138][139][140][141][142][143][144][145][146][147][148][149][150][151].…”

Section: Ring-opening Polymerisation (Rop) Of Lactide With Zinc Guanimentioning

confidence: 99%

“…Thus, the complexes [Zn(8MeBL)Cl 2 ] and [Zn(8MeBL)(OAc) 2 ] bearing a more basic imino imidazoline ligand 8MeBL have been tested as well [137]. It was found that the partial charge on the zinc atom and on the donating N imine atom is very important for lactide polymerisation activity (Fig.…”

Section: Zinc Guanidine Complexesmentioning

confidence: 99%

“…It was found that the partial charge on the zinc atom and on the donating N imine atom is very important for lactide polymerisation activity (Fig. 43) [137,168]. Polymerisations with complexes [Zn(8MeBL)Cl 2 ] and [Zn(8MeBL)(OAc) 2 ] yielded PLA polymers with molecular weights of 25,000 and 12,000 g/mol at a conversion of around 90% (Table 18).…”

Section: Zinc Guanidine Complexesmentioning

confidence: 99%

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Guanidine Metal Complexes for Bioinorganic Chemistry and Polymerisation Catalysis

Stanek

Rösener

Metz

et al. 2015

Topics in Heterocyclic Chemistry

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Guanidines are highly useful ligands which have conquered coordination chemistry within the last 20 years. Their CN 3 moiety allows multiple substitution patterns which enables tailoring them to a large variety of applications, ranging from bioinorganic coordination chemistry via medicinal chemistry to polymerisation catalysis. In bioinorganic chemistry, guanidines gave important stimuli in the modelling of copper type 1, 2 and 3 enzymes. This review provides with a comprehensive overview on complexes which have been reported with neutral guanidine ligands. Peralkylated guanidines as well as bicyclic or more complex guanidine-comprising entities are described in their coordination chemistry with transition and main-group metals. The structural features of the complexes as well as their most prominent features in bioinorganic chemistry or polymerisation catalysis are highlighted. Hereby, the role of the delocalisation of the positive charge within the guanidine unit gained during coordination is discussed in its importance for efficient and robust coordination. The delocalisation within the CN 3 unit can be measured by the structural value ρ which is discussed for numerous systems. The charge delocalisation makes neutral guanidines versatile and efficient for the stabilisation of highly different coordination modes and a large variety of oxidation states.

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Section: Ring-opening Polymerisation (Rop) Of Lactide With Zinc Guanimentioning

confidence: 99%

Section: Ring-opening Polymerisation (Rop) Of Lactide With Zinc Guanimentioning

confidence: 99%

Section: Zinc Guanidine Complexesmentioning

confidence: 99%

Section: Zinc Guanidine Complexesmentioning

confidence: 99%

See 2 more Smart Citations

Guanidine Metal Complexes for Bioinorganic Chemistry and Polymerisation Catalysis

Stanek

Rösener

Metz

et al. 2015

Topics in Heterocyclic Chemistry

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“…[1][2][3][4][5][6] A number of zinc complexes with guanidine or guanidinate ligands have been synthesized and applied as catalysts for the polymerization of lactide [7][8][9][10][11][12][13] and epoxidation of olefins. [14] Bicyclic, monoanionic guanidinate ligands, formed by the deprotonation of neutral guanidines, such as hppH (1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine), Htbn (1,5,7-triazabicyclo[4.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Oligomeric Zinc Complexes with Bicyclic and Acyclic Guanidinate Ligands

et al. 2012

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Keywords: Zinc / Oligomeric complexes / Alkyl complexes / N ligands / Hydrogen bonds / GuanidinesZinc dichloride and dimethylzinc were treated with several acyclic and bicyclic guanidines. Three different bicyclic guanidines and their potassium guanidinate salts were treated with ZnCl 2 . The reaction with the neutral guanidines afforded mononuclear complexes, stabilized by intramolecular hydrogen bonding. The reaction with the potassium guanidinate salts led to trinuclear complexes, which were extremely water sensitive. The reaction in the presence of added water furnished a tetranuclear complex with a central OZn 4 unit in good yield, to which six guanidinate ligands were bound.

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Bulk solvent‐free melt ring‐opening polymerization of L‐lactide catalyzed by Cu(II) and Cu(II)–Nd(III) complexes of the Salen‐type Schiff‐base ligand

Chen

Ding

Chu

et al. 2011

Applied Organom Chemis

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New insights into the lactide polymerisation with neutral N-donor stabilised zinc complexes: Comparison of imidazolin-2-imine vs. guanidine complexes

Cited by 58 publications

References 36 publications

Guanidine Metal Complexes for Bioinorganic Chemistry and Polymerisation Catalysis

Guanidine Metal Complexes for Bioinorganic Chemistry and Polymerisation Catalysis

Synthesis of Oligomeric Zinc Complexes with Bicyclic and Acyclic Guanidinate Ligands

Bulk solvent‐free melt ring‐opening polymerization of L‐lactide catalyzed by Cu(II) and Cu(II)–Nd(III) complexes of the Salen‐type Schiff‐base ligand

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