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Zinc complexes of chiral ligands obtained from methylbenzylamine
Condensation of S-methylbenzylamine with 2 equiv. of 2,4- tert-butylphenol yielded the chiral tridentate ligand 2H 2, which formed the dimetallic complex ( 2)(k-N,(μ-O) 2ZnEt)((μ-O) 2ZnEt), 3, upon reaction with ZnEt 2. Reaction of the chiral Schiff base ligand, 4H, obtained from condensation of sal...
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Published in: | Inorganic chemistry communications 2011-11, Vol.14 (11), p.1737-1741 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Condensation of
S-methylbenzylamine with 2 equiv. of 2,4-
tert-butylphenol yielded the chiral tridentate ligand
2H
2, which formed the dimetallic complex (
2)(k-N,(μ-O)
2ZnEt)((μ-O)
2ZnEt),
3, upon reaction with ZnEt
2. Reaction of the chiral Schiff base ligand,
4H, obtained from condensation of salicylaldehyde and
S-methylbenzylamine, with ZnEt
2 yielded (
4)
2Zn, 5, or (
4)ZnEt,
6, respectively. Deprotonation of
4H with NaH afforded tetrameric {(
4)Na}
4,
7. Complexes
3,
5 and
7 were characterized by single crystal diffraction studies and tested as initiators in the polymerization of
rac-lactide. Complexes
3 and
5 showed only low to moderate activity. All complexes yielded essentially atactic polymers with minor contents of heterotactic enchainment.
Several zinc complexes with chiral ligands based on
S-methylbenzylamine were synthesized and characterized by X-ray diffraction analysis. They proved to be active, but unselective catalysts for the polymerization of
rac-lactide.
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► Synthesis and characterization of a new tridentate, chiral ligand. ► Synthesis and characterization of 3 chiral zinc complexes and one chiral sodium complex. ► X-ray diffraction studies on 3 of these complexes. ► Application of 3 of these complexes in
rac-lactide polymerization. |
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ISSN: | 1387-7003 1879-0259 |
DOI: | 10.1016/j.inoche.2011.07.018 |