CN112409395B - 一锅法合成三齿氮配位金属化合物的方法 - Google Patents
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims description 20
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- 150000002736 metal compounds Chemical class 0.000 title claims description 8
- 238000005580 one pot reaction Methods 0.000 title claims description 6
- 230000002194 synthesizing effect Effects 0.000 title description 2
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims abstract description 9
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 7
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- 239000001257 hydrogen Substances 0.000 claims description 18
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 16
- 150000002431 hydrogen Chemical class 0.000 claims description 16
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 claims description 16
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 16
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- 229910052736 halogen Inorganic materials 0.000 claims description 11
- 150000002367 halogens Chemical class 0.000 claims description 11
- 239000003446 ligand Substances 0.000 claims description 5
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- 238000010528 free radical solution polymerization reaction Methods 0.000 abstract 2
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Abstract
本发明涉及一种锆和铪金属催化剂的制备及其烯烃高温溶液聚合制备超高分子量聚乙烯的应用。本发明报道的新型锆和铪金属催化剂含有刚性、大位阻的camphyl骨架,因而具有耐高温的特点,适用于烯烃高温溶液聚合制备超高分子量聚乙烯,所得聚烯烃重均分子量高于100万。此外,本发明通过原位一步法合成锆和铪金属催化剂,具有制备简单的优点,适于催化剂的大规模制备。因此,本发明报道的锆和铪金属催化剂具有原始创新性,能够增强我国参与国际高端聚烯烃高分子材料技术市场的竞争能力。
Description
技术领域
本发明涉及一种三齿氮配位金属化合物的制备方法。
背景技术
高分子材料是现代科学技术和社会发展的支柱,在尖端科技、国防建设和国民经济各个领域已成为不可缺少的重要材料。其中聚烯烃是发展最快、产量最大、用途极广的合成树脂。工业化的聚烯烃催化剂有Ziegler-Natta型催化剂(DE Pat 889229(1953);IT Pat545332(1956)和IT Pat 536899(1955)),Phillips型催化剂(Belg.Pat.530617(1955))和茂金属型催化剂(W.Kaminsky,Metalorganic Catalysts for Synthesis andPolymerization,Berlin:Springer,1999),以及近年来发展的非茂过渡金属配合物型的高效均聚和共聚催化剂。三齿氮配位的非茂过渡金属催化剂,具有活性高、热稳定性好、立构选择性高的特点,如US 20140316089报道的高效金属催化剂,可制备高等规聚丙烯和聚烯烃弹性体等。然而,该类催化剂的合成为多步反应,并且所用金属源的价格昂贵,成本较高。例如,合成三齿氮配位的金属铪化合物,需要配体与Hf(NMe2)2Cl2首先反应制备二氯金属铪化合物,然后再与Me2Mg或者Me3Al等反应,甲基化后得到相应的金属铪催化剂。不但反应复杂,而且Hf(NMe2)2Cl2等原料成本较高。本发明报道了一种制备该类三齿氮配位金属化合物的新方法,具有反应简单,产率高,原料易得,成本低的特点。
发明内容
本发明提供了一种一锅法制备三齿氮配位金属化合物的方法,如式(I)所示:
其中,M选自钛、锆、铪;R1选自甲基,乙基,氢,异丙基,卤素,苯基,取代苯基;R2选自甲基,乙基,氢,异丙基,卤素,苯基,取代苯基;R3选自甲基,乙基,氢,异丙基,卤素,苯基,取代苯基;R4选自甲基,乙基,氢,异丙基;R5选自甲基,乙基,氢,异丙基,或R5与R4形成环状结构;R6选自甲基,乙基,氢,异丙基,卤素,苯基,取代苯基;R7选自甲基,乙基,氢,异丙基,卤素,苯基,取代苯基;R8选自甲基,乙基,氢,异丙基,卤素,苯基,取代苯基。
本发明所提供的制备方法包括以下步骤:
氮气氛围下,HfCl4悬浮于无水溶剂中,在-60至-20℃下,加入4摩尔当量的甲基溴化镁,反应2小时;然后在-60至-20℃下加入1摩尔当量的配体,缓慢升至室温反应4-24小时;减压除去溶剂,加入无水溶剂提取,再次除去溶剂后得到黄色固体产物。
上述制备方法中,所述无水溶剂选自苯、甲苯、二甲苯、正己烷。
本发明提供了一种一锅法制备三齿氮配位金属化合物的方法。本发明报道了一种制备三齿氮配位金属化合物的新方法,具有反应简单,一锅法合成,无需分离中间产物,产率高,原料易得,成本低的特点。
附图说明
图1为化合物[2,6-iPr-C6H3-N-CH2-pyridine-C10H6-CH2-N-C6H4-2-Me]HfMe2的核磁氢谱图;
图2为化合物[2,6-iPr-C6H3-N-CH2-pyridine-C6H4-CH2-N-C6H4-2-Me]HfMe2的核磁氢谱图。
具体实施方式
通过实施例进一步说明本发明,但本发明并不限于此。本发明的实施例可以使本专业的技术人员更全面的理解本发明。
下述实施例中所使用的实验方法如无特殊说明,均为常规方法。
以下以具体的实施例描述本发明。
实施例1、化合物[2,6-iPr-C6H3-N-CH2-pyridine-C10H6-CH2-N-C6H4-2-Me]HfMe2的制备方法。
氮气氛围下,在100mL Schlenk中加入1.92g HfCl4(6.0mmol),加入无水甲苯30mL。在-40℃下,用注射器加入甲基溴化镁的乙醚溶液8mL(24mmol,3M),然后保持该温度反应2小时。在-40℃下,将3.1g配体2,6-iPr-C6H3-NH-CH2-pyridine-C10H6-CH2-NH-C6H4-2-Me(6.0mmol)加入,缓慢升至室温后继续反应12小时。减压除去溶剂,然后加入无水甲苯50mL,过滤后,将滤液抽干得到黄色固体产物3.97g(5.52mmol),产率92%。1H NMR(C6D6):δ7.70(d,1H,J=8.3Hz),7.64(d,1H,J=8.1Hz),7.44(d,2H,J=8.2Hz),7.28-7.19(m,2H),7.18-6.96(m,8H),6.91(d,1H,J=7.4Hz),6.63(d,1H,J=7.8Hz),5.21(d,1H,J=20.5Hz),4.89(d,1H,J=20.5Hz),4.43(br,1H),4.10(br,1H),4.00(dt,1H,J=13.7,6.9Hz),3.31(br,1H),2.34(br,3H),1.36(d,3H,J=6.8Hz),1.31(d,3H,J=6.8Hz),1.15(d,3H,J=6.8Hz),0.92(d,3H,J=6.8Hz),-0.06(s,3H),-0.47(br,3H).
实施例2、化合物[2,6-iPr-C6H3-N-CH2-pyridine-C6H4-CH2-N-C6H4-2-Me]HfMe2的制备方法。
氮气氛围下,在100mL Schlenk中加入3.20g HfCl4(10.0mmol),加入无水甲苯50mL。在-40℃下,用注射器加入甲基溴化镁的乙醚溶液14mL(42mmol,3M),然后保持该温度反应2小时。在-40℃下,将4.6g配体2,6-iPr-C6H3-NH-CH2-pyridine-C6H4-CH2-NH-C6H4-2-Me(10.0mmol)加入,缓慢升至室温后继续反应12小时。减压除去溶剂,然后加入无水甲苯100mL,过滤后,将滤液抽干得到黄色固体产物6.03g(9.0mmol),产率90%。1H NMR(C6D6):δ7.25(d,1H,J=7.0Hz),7.22-7.01(m,10H),6.97(t,1H,J=7.8Hz),6.79(d,1H,J=7.4Hz),6.54(d,1H,J=7.4Hz),5.25(d,1H,J=20.3Hz),4.75(d,1H,J=20.3Hz),4.47(br,1H),4.09-3.89(m,2H),3.43(br,1H),2.42(br,3H),1.39(d,3H,J=6.9Hz),1.35(d,3H,J=6.8Hz),1.23(d,3H,J=6.5Hz),1.03(d,3H,J=6.8Hz),-0.09(br,6H).
Claims (3)
2.权利要求1所述的方法,包括如下步骤:
氮气氛围下,HfCl4悬浮于无水溶剂中,在-40℃下,加入4摩尔当量的甲基溴化镁,反应2小时;然后在-40℃下加入1摩尔当量的配体,缓慢升至室温反应4-24小时;减压除去溶剂,加入无水溶剂提取,再次除去溶剂后得到黄色固体产物。
3.根据权利要求2所述的方法,其特征在于:所述无水溶剂选自苯、甲苯、二甲苯、正己烷。
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