Synthesis and characterizations of bis(phenoxy)-amine tin(II) complexes for ring-opening polymerization of lactide
作者： Siriwan Praban , Supajittra Yimthachote , Jiraya Kiriratnikom , Sucheewin Chotchatchawankul , Jonggol Tantirungrotechai
DOI: 10.1002/POLA.29479
关键词:
摘要: A series of tin(II) complexes supported by N₂O₂ bis(phenol)‐amine ligands were prepared from the reactions corresponding with Sn[N(SiMe₃)₂]₂ in benzene at room temperature. The designed to have different substituted group ortho‐position on aryl rings (R = ᵗBu, CH₃) and N‐containing side arm (E CH₂NEt₂ pyridine) giving a variation E CH₂NEt₂, 2a; R py, 2b; CH₃, 2c; 2d). All characterized NMR spectroscopy single‐crystal X‐ray analysis. crystallography revealed that all monomeric four‐coordinate tin center distorted seesaw structure. are active for solvent‐free polymerization l‐lactide 120 °C poly(l‐lactide) narrow moderate dispersity (Ð 1.12–1.56). In presence benzyl alcohol during polymerization, resulting polymer was found be linear having as end while, absence alcohol, cyclic. large ᵗBu decrease activity while more basic increase activity. rac‐lactide under similar condition gave PLA slight heterotactic bias catalysts. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Chem. 2019, 57, 2104–2112
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