Aluminum complexes with benzoxazolphenolate ligands: Synthesis, characterization and catalytic properties for ring-opening polymerization of cyclic esters

详细信息    查看全文

• 作者：Yunping Zhang ; Aihong Gao ; Yongfang Zhang ; Zhenghe Xu ; ^{stu_xuzh@ujn.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Wei Yao ; ^{yaoweiujn@aliyun.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Aluminum complex ; Benzoxazolphenol ; Ring-opening polymerization ; Caprolactone ; Lactide
• 刊名：Polyhedron
• 出版年：2016
• 出版时间：7 July 2016
• 年：2016
• 卷：112
• 期：Complete
• 页码：27-33
• 全文大小：960 K

文摘

A family of bidentate ligands, 1–3, were synthesized by the reactions of 5-diethylamino-2-nitrosophenol with bromomethylphenol derivatives. Treatment of the ligands 1–3 with one equivalent of AlMe₃ gave the corresponding aluminum complexes 4–6, respectively. All the complexes were characterized by ¹H and ¹³C NMR spectroscopy, along with elemental analysis. Single crystal X-ray diffraction analysis of complex 5 revealed that the Al complex has a distorted tetrahedral geometry around the metal center. All the aluminum complexes are efficient initiators for the ring-opening polymerization of ε-caprolactone and lactide in the presence of benzyl alcohol in a living fashion. The aluminum complexes produced PLA with a slight heterotactic bias.