Dimeric Aluminum Chloride Complexes ofN-Alkoxyalkyl-β-ketoimines:  Activation with Propylene Oxide To Form Efficient Lactide Polymerization Catalysts

2004 ◽  
Vol 23 (10) ◽  
pp. 2382-2388 ◽  
Author(s):  
Simon Doherty ◽  
R. John Errington ◽  
Neil Housley ◽  
William Clegg
Keyword(s):  
Propylene Oxide ◽  
Aluminum Chloride ◽  
Polymerization Catalysts ◽  
Chloride Complexes ◽  
Lactide Polymerization

ChemInform Abstract: ALUMINUM CHLORIDE COMPLEXES WITH PURINE, ADENINE AND GUANINE

1983 ◽  
Vol 14 (12) ◽  
Author(s):  
C. M. MIKULSKI ◽  
S. COCCO ◽  
L. MATTUCCI ◽  
N. DEFRANCO ◽  
L. WEISS ◽  
...  
Keyword(s):  
Aluminum Chloride ◽  
Chloride Complexes

scholarly journals Syntheses, Solid-state Structures and Catalytic Activity of Zinc Carboxylate Complexes in Lactide Polymerization

2014 ◽  
Vol 69 (11-12) ◽  
pp. 1365-1374 ◽  
Author(s):  
Christoph Scheiper ◽  
Christoph Wölper ◽  
Dieter Bläser ◽  
Joachim Roll ◽  
Stephan Schulz
Keyword(s):  
Ring Opening ◽  
Zinc Complex ◽  
X Ray Diffraction ◽  
Polymerization Catalysts ◽  
Co Catalyst ◽  
Carboxylate Complexes ◽  
X Ray ◽  
Carboxylate Groups ◽  
Solid State Structures ◽  
Lactide Polymerization

Abstract Three dinuclear zinc carboxylate complexes [L1-3Zn(μ,η2-O2CPh)]2 (1, 2, 4) containing either the bidentate N,N′-chelating β-diketiminate ligand RNC(Me)C(H)C(Me)NR (R = 2,6-iPr2-C6H3, L1, complex 1), the tridentate O,N,N-chelating ligand OC(Me)C(H)C(Me)NCH2CH2NMe2 (L2, complex 2) or the bis-N,N′-chelating bis-β-diketiminate ligand RNC(Me)C(H)C(Me)NNC(Me)- C(H)C(Me)NR (R = 2,6-iPr2-C6H3, L3, complex 4) were synthesized and characterized including single-crystal X-ray diffraction. Reaction of the neutral bis-β-diketimine (L3(H)2) with two equivalents of ZnMe2 leads to the expected heteroleptic dinuclear zinc complex L3(ZnMe)2 3 in 93% yield. Further reaction with benzoic acid PhCO2H leads to complex 4. Complex 2 forms a rather strong carboxylate-bridged dimer, whereas the carboxylate groups in complexes 1 and 4 act as asymmetrical bridges between both Zn atoms, pointing to the formation of a weakly bonded dimer. The zinc atoms in 1 and 4 are tetrahedrally coordinated, whereas in 2 the coordination number is increased to five due to the coordination of the pendant donor arm. The ring opening polymerization (ROP) of rac-lactide was investigated with the zinc complexes 1-4 and diazabicycloundec-7-ene (DBU) as a co-catalyst. Complexes 2 and 3 are active polymerization catalysts, which in the presence of DBU converted 200 equiv. of rac-lactide into polylactide within 10 min at ambient temperature. The analysis of the crude polymer showed that the lactide polymerization with catalyst 2 occurs via a slightly modified activated-monomer mechanism.

Discrete Yttrium(III) Complexes as Lactide Polymerization Catalysts

1999 ◽  
Vol 32 (7) ◽  
pp. 2400-2402 ◽  
Author(s):  
Bradley M. Chamberlain ◽  
Yongping Sun ◽  
John R. Hagadorn ◽  
Eric W. Hemmesch ◽  
Victor G. Young ◽  
...  
Keyword(s):  
Polymerization Catalysts ◽  
Lactide Polymerization

Aluminum complexes with Schiff base bridged bis(indolyl) ligands: synthesis, structure, and catalytic activity for polymerization of rac-lactide

2019 ◽  
Vol 48 (40) ◽  
pp. 15290-15299 ◽  
Author(s):  
Yun Wei ◽  
Lulu Song ◽  
Ling Jiang ◽  
Zeming Huang ◽  
Shaowu Wang ◽  
...  
Keyword(s):  
Schiff Base ◽  
Catalytic Activity ◽  
Polymerization Catalysts ◽  
Aluminum Complexes ◽  
Lactide Polymerization

A series of aluminum complexes with Schiff base bridged indolyl ligands were synthesized as rac-lactide polymerization catalysts.

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