Magnesium Pyrazolyl-Indolyl Complexes as Catalysts for Ring-Opening Polymerization of L-Lactide

Polymers

Chi-Tien Chen¹  Deng-Hao Lin²  Kuo-Fu Peng² 

[1] Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan

关键词: magnesium;    pyrazolyl;    indolyl;    ring-opening polymerization;    biodegradable;   

DOI  :  10.3390/polym7101492

来源: mdpi

【 摘 要 】

A series indole-based ligand precursors, Pz^RIndH (R = H, Pz^HIndH; R = Me, Pz^MeIndH; R = t-Bu, Pz^tBuIndH; and R = Ph, Pz^PhIndH), have been synthesized via copper-catalyzed N-arylation (for Pz^HIndH) or the Bartoli indole synthesis (for Pz^MeIndH, Pz^tBuIndH and Pz^PhIndH) reactions with moderate to high yield. Reactions of these ligand precursors with 0.7 equivalent of MgⁿBu₂ in THF (for 1) or hexane (for 2–4) afforded the bis-indolyl magnesium complexes 1–4, respectively. All the ligand precursors and related magnesium complexes have been characterized by NMR spectroscopy and elemental analyses. The molecular structure is reported for compound 1. These novel magnesium complexes demonstrate efficient catalytic activities for the ring-opening polymerization of L-lactide in the presence of alcohol.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.