...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis, characterization and reactivity of single-site aluminium amides bearing benzotriazole phenoxide ligands: Catalysis for ring-opening polymerization of lactide and carbon dioxide/propylene oxide coupling
【24h】

Synthesis, characterization and reactivity of single-site aluminium amides bearing benzotriazole phenoxide ligands: Catalysis for ring-opening polymerization of lactide and carbon dioxide/propylene oxide coupling

机译：带有苯并三唑酚盐配体的单中心铝酰胺的合成，表征和反应性：丙交酯和二氧化碳/环氧丙烷偶联的开环聚合催化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

New aluminium complexes containing bis-BTP ligands (BTP = N,O-bidentate benzotriazole phenoxide) were synthesized and structurally characterized. Amine elimination of Al(NMe_2)_3 with ~RBTP-H ligands (~(CMe2Ph)BTP-H = 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1- phenylethyl)phenol, ~(t-Bu)BTP-H = 2-(2H-benzotriazol-2-yl)-4,6-di-tert- butylphenol and ~(TMCl)BTP-H = 2-tert-butyl-6-(5-chloro-2H-benzotriazol- 2-yl)-4-methylphenol) (2.0 mol equiv.) in toluene or hexane afforded the penta-coordinated single-site amidoaluminium complexes [(~RBTP) _2Al(NMe_2)] (R = CMe2Ph for 1; R = t-Bu for 2; R = TMCl for 3) in satisfactory yields. With the addition of H_2O (0.5 molar equiv.), the hydrolysis of Al amides 2 and 3 in a mixed solvent of THF/toluene at 25 °C produced oxo-bridged bimetallic aluminium complexes [{(~RBTP)_2Al}_2(μ-O)] (R = t-Bu for 4 and R = TMCl for 5) in ≥70% yield. According to single crystal X-ray diffraction studies, complex 2 shows a monomeric Al(iii) amide with bis(~(t-Bu)BTP) ligands and one -NMe_2 group, whereas alumoxane 4 is a dinuclear species, in which the bonding mode of the Al-O-Al moiety from μ_2-oxo assumes a linear type. Catalysis for ring-opening polymerization of lactide (LA) and CO_2/propylene oxide (PO) coupling was systematically studied. Single-site Al amide 3 is an efficient initiator for LA polymerizations with a living character; the polymerization displays a first-order dependence on the concentration of l-LA. Bimetallic BTP-ligated alumoxane 5 is an active catalyst (TOF: 120 h~(-1)) for the coupling of CO_2 with PO in the presence of n-Bu_4NBr to give propylene carbonate under mild conditions.
机译：合成了新的含双BTP配体的铝配合物（BTP = N，O-二齿苯并三唑苯氧基）。用〜RBTP-H配体（〜（CMe2Ph）BTP-H = 2-（2H-苯并三唑-2-基）-4,6-双（1-甲基-1-苯乙基）苯酚消除Al（NMe_2）_3的胺，〜（t-Bu）BTP-H = 2-（2H-苯并三唑-2-基）-4,6-二叔丁基苯酚，〜（TMCl）BTP-H = 2-叔丁基-6-（在甲苯或己烷中的5-氯-2H-苯并三唑-2-基）-4-甲基苯酚（2.0摩尔当量）得到五配位单中心酰胺铝配合物[（〜RBTP）_2Al（NMe_2）]（R = CMe 2 Ph为1; R ＝ t-Bu为2; R ＝ TMCl为3），具有令人满意的产率。加入H_2O（0.5摩尔当量）后，在25°C的THF /甲苯混合溶剂中水解Al酰胺2和3生成氧桥联双金属铝络合物[{（〜RBTP）_2Al} _2（μ -O）]（R = 4的t-Bu，R = 5的TMCl）≥70％的收率。根据单晶X射线衍射研究，配合物2显示具有双（〜（t-Bu）BTP）配体和一个-NMe_2基团的单体Al（iii）酰胺，而铝氧烷4是双核物质，其中键合μ_2-氧代的Al-O-Al部分的分子模式为线性。系统研究了丙交酯（LA）和CO_2 /环氧丙烷（PO）偶联反应的开环聚合催化作用。单中心的铝酰胺3是具有活性特征的LA聚合的有效引发剂。聚合反应显示出对1-LA浓度的一级依赖性。双金属BTP连接的铝氧烷5是一种活性催化剂（TOF：120 h〜（-1）），用于在温和的条件下在n-Bu_4NBr存在下将CO_2与PO偶联。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号