Cobalt (II) complex catalyzed polymerization of lactide and coupling of CO2 and styrene oxide into cyclic styrene carbonate

Pradhan, Harish Chandra; Mantri, Somanath; Routaray, Anita; Maharana, Tungabidya; Sutar, Alekha Kumar

doi:10.1007/s12039-019-1722-6

Cited by 9 publications

(4 citation statements)

References 41 publications

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“…complex that achieved a 79% conversion at 30 C in 24 hr with narrow MWDs (1.12). [88] Our previously studied Co (II) catalysts, which were supported by N-substituted pyrazolyl amines afforded low-molecular-weight PLAs with comparable heterotacticities and narrower PDIs at −50 C. [49] However, our polymerization suggested that an increase in the steric hindrance might hamper the alternative insertion of the lactide monomers. [89] Compared with our current Co (II) system, the recently reported co-tripodal complexes/ i PrOH system proved to be more effective, achieving an 81% conversion within 2 min to produce isotactic PLA (P m = 0.73).…”

Section: Rac-lactide Polymerizationmentioning

confidence: 79%

Diverse coordination geometry of cobalt (II), zinc (II), and cadmium (II) complexes comprising N,N‐bis(1H‐pyrazol‐1‐yl)methyl)amines derivatives: Synthesis, structures, and ring opening polymerization of rac‐lactide

Choe

Lee

Nayab

2021

Applied Organom Chemis

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A series of six new complexes of Co (II), Zn (II), and Cd (II) supported by bis (1H-pyrazol-1-yl)methyl)amine derivatives (N,N-bis((1H-pyrazol-1-yl)methyl)-1-phenylethanamine (L A ), N,N-bis((1H-pyrazol-1-yl)methyl)-1-(furan-2-yl) methanamine (L B ), and N,N-bis((1H-pyrazol-1-yl)methyl)-4-isopropylaniline (L C ) synthesized. The direct chelation of the ligands (L n = L A − L C ) with ZnCl 2 , CoCl 2 .6H 2 O, and CdBr 2 Á4H 2 O produced [L n MX 2 ] (L n = L A − L C ; M = Zn, Co; X = Cl; M = Cd, X = Br) and [L C Cd(μ-Br)Br] 2 in high yields. Structural studies revealed that [L n ZnCl 2 ] (L n = L A − L C ), [L A CdBr 2 ], and [L C CoCl 2 ] adopted the distorted tetrahedral geometry, whereas [L A CoCl 2 ] and [L C Cd(μ-Br)Br] 2 adopted a distorted square pyramidal geometry by coordinating with corresponding ligands in a bidentate fashion. Additionally, [L B CdBr 2 ] possessed a distorted trigonal bipyramidal geometry that was obtained by the chelation with corresponding ancillary ligands in the tridentate coordination mode. The dimethyl derivatives of [L n MMe 2 ] (L n = L A − L C ; M = Zn, Co; X = Cl; M = Cd, X = Br), which were generated in situ, were employed to catalyze the ring-opening polymerization (ROP) of rac-lactide (rac-LA). Hetero-enriched polylactides (PLAs) were furnished with all these complexes (Complex [L B ZnCl 2 ] produced PLA with superior heterotactic bias (P r of up to 0.93) at −25 C). PLAs with wide-ranged polydispersity indices (PDI = 1.43-1.54) were produced in all the cases irrespective of the M (II) center and variations in ancillary ligands. K E Y W O R D S (pyrazolyl)amine ligand, diverse coordination environment, hetero-enriched poly (lactide), ringopening polymerization

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Section: Rac-lactide Polymerizationmentioning

confidence: 79%

Diverse coordination geometry of cobalt (II), zinc (II), and cadmium (II) complexes comprising N,N‐bis(1H‐pyrazol‐1‐yl)methyl)amines derivatives: Synthesis, structures, and ring opening polymerization of rac‐lactide

Choe

Lee

Nayab

2021

Applied Organom Chemis

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“…50 Recently, Sutar et al described the ROP of L-lactide catalyzed by the Co(II)-salen complex, which afforded 79% conversion at 30 C aer 24 h with a narrow range of MWD values (1.12). 89 In comparison with the hereby developed Co(II)-based catalytic system, the recently reported co-tripodal complexes/ i PrOH catalytic system proved to be effective, affording 81% conversion within 2 min to produce isotactic PLA (P m ¼ 0.73). 90 Chakraborty's group demonstrated that CoCl 2 $6H 2 O could effectively catalyze the polymerization of rac-LA, affording 96% conversion within 1 h under melting conditions (145 C), albeit with negligible stereocontrol.…”

Section: Rac-lactide Polymerizationmentioning

confidence: 86%

Synthesis, structures, and catalytic efficiency in ring opening polymerization of rac-lactide with tridentate vs. bidentate cobalt(ii), zinc(ii), and cadmium(ii) complexes containing N-substituted N,N-bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)amine ligands

2021

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“…Very recently, Sutar et al described the ROP of L-lactide catalyzed by the Co(II) salen complex 69 ( Figure 12) [57]. Optimization of the reaction conditions revealed that one equiv./Co of BnOH was required to enable the polymerization.…”

Section: Cobaltmentioning

confidence: 99%

Synthesis of Biodegradable Polymers: A Review on the Use of Schiff-Base Metal Complexes as Catalysts for the Ring Opening Polymerization (ROP) of Cyclic Esters

2020

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Cobalt (II) complex catalyzed polymerization of lactide and coupling of CO2 and styrene oxide into cyclic styrene carbonate

Cited by 9 publications

References 41 publications

Diverse coordination geometry of cobalt (II), zinc (II), and cadmium (II) complexes comprising N,N‐bis(1H‐pyrazol‐1‐yl)methyl)amines derivatives: Synthesis, structures, and ring opening polymerization of rac‐lactide

Diverse coordination geometry of cobalt (II), zinc (II), and cadmium (II) complexes comprising N,N‐bis(1H‐pyrazol‐1‐yl)methyl)amines derivatives: Synthesis, structures, and ring opening polymerization of rac‐lactide

Synthesis, structures, and catalytic efficiency in ring opening polymerization of rac-lactide with tridentate vs. bidentate cobalt(ii), zinc(ii), and cadmium(ii) complexes containing N-substituted N,N-bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)amine ligands

Synthesis of Biodegradable Polymers: A Review on the Use of Schiff-Base Metal Complexes as Catalysts for the Ring Opening Polymerization (ROP) of Cyclic Esters

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