Publication: Synthesis of cyclic polyesters: Effects of alkoxy side chains in salicylaldiminato tin(ii) complexes
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Issued Date
2015-07-21
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ISSN
14779234
14779226
14779226
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2-s2.0-84939235538
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Mahidol University
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SCOPUS
Bibliographic Citation
Dalton Transactions. Vol.44, No.27 (2015), 12357-12364
Suggested Citation
Phonpimon Wongmahasirikun, Paweenuch Prom-on, Preeyanuch Sangtrirutnugul, Palangpon Kongsaeree, Khamphee Phomphrai Synthesis of cyclic polyesters: Effects of alkoxy side chains in salicylaldiminato tin(ii) complexes. Dalton Transactions. Vol.44, No.27 (2015), 12357-12364. doi:10.1039/c5dt00139k Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/35743
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Title
Synthesis of cyclic polyesters: Effects of alkoxy side chains in salicylaldiminato tin(ii) complexes
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Abstract
© The Royal Society of Chemistry 2015. A new class of salicylaldiminato tin(ii) catalysts having different alkoxy side chains has been developed. The ligands were modified to have different lengths and flexibilities such as -(CH2)2- (2a), -(CH2)3- (2b), -(ortho-C6H4)CH2- (2c) and -(CH2)2-O-(CH2)2- (2d). Complexes 2a, b were characterized crystallographically revealing a more constrained environment around the metal in complex 2a. These catalysts are active for the solvent-free polymerization of l-lactide and ε-caprolactone. Complex 2a having a shorter side chain was shown to better promote intramolecular transesterification affording cyclic polylactides and cyclic poly(ε-caprolactone). Complexes 2b and 2d having longer side chains produced cyclic poly(ε-caprolactone) as a major product but failed to give cyclic polylactides.