2010
DOI: 10.1039/b919162c
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Dicationic and zwitterionic catalysts for the amine-initiated, immortal ring-opening polymerisation of rac-lactide: facile synthesis of amine-terminated, highly heterotactic PLA

Abstract: Dicationic, zwitterionic and "conventional" yttrium compounds act as catalysts for the primary or secondary amine-initiated immortal ROP of rac-lactide; amine-terminated, highly heterotactic poly(rac-lactides) with narrow polydispersities and well-controlled molecular weights are prepared in this manner.

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Cited by 137 publications
(39 citation statements)
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“…Activation of the monomer by a cationic species was also claimed by Duchateau et al, who used bulky yttrium complexes (in the form of a zwitterion or dication) as the catalysts of lactide polymerization in addition to the amine initiator [8]. In a proposed scheme, the activation of the monomer by a Lewis acid was assumed, but the possible interactions between the Lewis acid and the nucleophilic amine was not considered.…”
Section: Methodsmentioning
confidence: 93%
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“…Activation of the monomer by a cationic species was also claimed by Duchateau et al, who used bulky yttrium complexes (in the form of a zwitterion or dication) as the catalysts of lactide polymerization in addition to the amine initiator [8]. In a proposed scheme, the activation of the monomer by a Lewis acid was assumed, but the possible interactions between the Lewis acid and the nucleophilic amine was not considered.…”
Section: Methodsmentioning
confidence: 93%
“…However, most studies have focused on polymerizations catalyzed by coordination catalysts (with the application of primary amines as the initiators). Tin octoate and aluminum alkoxides were the most frequently used [2,3,4,20,31], although other metal complexes (e.g., complexes of Y, Nd, Ca, Sr, In) were also applied [8,32,33].…”
Section: Methodsmentioning
confidence: 99%
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“…18 and 59 bring about heterotactic immortal polymerization of rac-lactide in the presence of alcohol. Dicationic yttrium complex with tris(pyrazolyl)methane ligand (60) in combination with primary or secondary amine or alcohol also produces highly heterotactic polymer (P r up to 93%) (155). The polymerization has an immortal character, and an end-functionalized polymer with narrow molecular-weight distribution forms.…”
Section: Polymerization Of Lactidesmentioning
confidence: 99%
“…12-14 A lot of metal complexes such as Zn, [15][16][17][18][19][20][21][22][23][24] Mg, [25][26][27][28][29][30][31][32][33][34][35][36][37] Al, [38][39][40][41][42][43][44][45] Sn, [46][47][48][49][50][51][52][53][54][55][56][57] and rare earth metal complexes [58][59][60][61][62][63][64][65][66][67...…”
Section: Introductionmentioning
confidence: 99%