NDLI: Potassium complexes supported by monoanionic tetradentate amino-phenolate ligands: synthesis, structure and catalysis in the ring-opening polymerization of <i>rac</i>-lactide

Content Provider	Royal Society of Chemistry (RSC)
Author	Yao, Chenhui Xu, Shaoan Ma, Haiyan Yang, Yang
Copyright Year	2017
Abstract	A series of potassium complexes bearing monoanionic tetradentate amino-phenolate ligands, [LK]2 (L = {(2-R1)C6H4CH2N[(CH2)2R2]CH2(4-R4-6-R3)C6H2O-}, R1 = NMe2, R2 = NEt2, R3 = CPh3, R4 = Me (1); R1 = R2 = NEt2, R3 = CPh3, R4 = Me (2); R1 = NMe2, R2 = NEt2, R3 = R4 = cumyl (4); R1 = R2 = OMe, R3 = tBu, R4 = Me (6); L = (2-NMe2)C6H4CH2N[[CH2-(S)-1-butylpyrrolidinyl]CH2(4-Me-6-CPh3)C6H2O-] (3)), have been synthesized via reactions of KN(SiMe3)2 and 1 equiv. of the corresponding aminophenols. The solid-state structures of typical complexes 4 and 6 are determined via X-ray diffraction studies, which reveal the dinuclear nature of these complexes. By contrast, DOSY measurements of 1, 4 and 6 suggest that these complexes are monomeric in solution. It is noteworthy that the coordination chemistry of these potassium complexes is versatile, which is closely related to the nature of the ortho-substituent of the phenolate ring, as indicated by the results of the corresponding spectroscopic studies. In the presence of iPrOH, 1–4 and 6 could initiate the polymerization of 500 equiv. of rac-lactide to achieve high monomer conversions within several minutes but afford atactic PLAs with slightly isotactic-enriched microstructures (Pm = 0.58–0.60). Experimental results also demonstrated that a bulky trityl substituent at the ortho-position of the phenolate ring of the ligand framework is beneficial for the enhancement of the activities of these potassium complexes.
Starting Page	6087
Ending Page	6097
Page Count	11
File Format	HTM / HTML PDF
ISSN	14779226
Volume Number	46
Issue Number	18
Journal	Dalton Transactions
DOI	10.1039/c7dt00812k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	KN Potassium NME2 X-ray crystallography Coordination complex Isopropyl alcohol Polymerization Monomer Tacticity Substituent Ligand
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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