CN116354887A - 一种双咪唑型氨基酸类离子液体及其制备方法与应用 - Google Patents
一种双咪唑型氨基酸类离子液体及其制备方法与应用 Download PDFInfo
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- 239000002608 ionic liquid Substances 0.000 title claims abstract description 66
- 150000001413 amino acids Chemical class 0.000 title claims abstract description 41
- AZUHIVLOSAPWDM-UHFFFAOYSA-N 2-(1h-imidazol-2-yl)-1h-imidazole Chemical compound C1=CNC(C=2NC=CN=2)=N1 AZUHIVLOSAPWDM-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- -1 histidine anions Chemical class 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 32
- HNDVDQJCIGZPNO-UHFFFAOYSA-N histidine Natural products OC(=O)C(N)CC1=CN=CN1 HNDVDQJCIGZPNO-UHFFFAOYSA-N 0.000 claims abstract description 21
- 150000005676 cyclic carbonates Chemical class 0.000 claims abstract description 19
- 239000004593 Epoxy Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 36
- 239000003054 catalyst Substances 0.000 claims description 23
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 14
- MCTWTZJPVLRJOU-UHFFFAOYSA-N 1-methyl-1H-imidazole Chemical compound CN1C=CN=C1 MCTWTZJPVLRJOU-UHFFFAOYSA-N 0.000 claims description 12
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- 239000000706 filtrate Substances 0.000 claims description 12
- 238000010992 reflux Methods 0.000 claims description 12
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- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 claims description 10
- 238000001291 vacuum drying Methods 0.000 claims description 10
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 claims description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 8
- 239000001569 carbon dioxide Substances 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 8
- 238000004821 distillation Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 6
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- 239000003960 organic solvent Substances 0.000 claims description 6
- 239000002244 precipitate Substances 0.000 claims description 6
- ZJJATABWMGVVRZ-UHFFFAOYSA-N 1,12-dibromododecane Chemical compound BrCCCCCCCCCCCCBr ZJJATABWMGVVRZ-UHFFFAOYSA-N 0.000 claims description 4
- ULTHEAFYOOPTTB-UHFFFAOYSA-N 1,4-dibromobutane Chemical compound BrCCCCBr ULTHEAFYOOPTTB-UHFFFAOYSA-N 0.000 claims description 4
- SGRHVVLXEBNBDV-UHFFFAOYSA-N 1,6-dibromohexane Chemical compound BrCCCCCCBr SGRHVVLXEBNBDV-UHFFFAOYSA-N 0.000 claims description 4
- GTQHJCOHNAFHRE-UHFFFAOYSA-N 1,10-dibromodecane Chemical compound BrCCCCCCCCCCBr GTQHJCOHNAFHRE-UHFFFAOYSA-N 0.000 claims description 3
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- SFJRUJUEMVAZLM-UHFFFAOYSA-N 2-[(2-methylpropan-2-yl)oxymethyl]oxirane Chemical compound CC(C)(C)OCC1CO1 SFJRUJUEMVAZLM-UHFFFAOYSA-N 0.000 claims description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical class [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 2
- AWMVMTVKBNGEAK-UHFFFAOYSA-N Styrene oxide Chemical compound C1OC1C1=CC=CC=C1 AWMVMTVKBNGEAK-UHFFFAOYSA-N 0.000 claims description 2
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical compound C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 claims description 2
- GKIPXFAANLTWBM-UHFFFAOYSA-N epibromohydrin Chemical compound BrCC1CO1 GKIPXFAANLTWBM-UHFFFAOYSA-N 0.000 claims description 2
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 2
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- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 abstract description 4
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- 230000000694 effects Effects 0.000 description 10
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000005481 NMR spectroscopy Methods 0.000 description 7
- 238000005406 washing Methods 0.000 description 6
- 125000000217 alkyl group Chemical group 0.000 description 5
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 230000035484 reaction time Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
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- SXDBWCPKPHAZSM-UHFFFAOYSA-M bromate Inorganic materials [O-]Br(=O)=O SXDBWCPKPHAZSM-UHFFFAOYSA-M 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
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- C07D233/54—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
- C07D233/64—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with substituted hydrocarbon radicals attached to ring carbon atoms, e.g. histidine
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Abstract
一种双咪唑型氨基酸类离子液体及其制备方法与应用,本发明提供了一种新型双咪唑型氨基酸类离子液体,阴离子为组氨酸负离子和溴阴离子,阳离子为双咪唑型阳离子;所述双咪唑型氨基酸类离子液体以来自自然界的价廉易得、绿色、具有多功能性的天然氨基酸制备,方法简单、成本低、操作简便可控、易于放大;将结构独特的多功能双咪唑型氨基酸离子液体作为新型催化材料应用于CO2与环氧底物环加成制备环状碳酸酯,与通常催化材料相比,本发明的CO2催化转化条件简便、易控、高效,避免外加溶剂、助剂,反应条件温和,能耗低,大幅度地减少了环碳酸酯生产成本。
Description
技术领域
本发明涉及一种离子液体及其制备方法与应用,具体涉及一种双咪唑型离子液体及其制备方法与应用。
背景技术
全球变暖及其对生态系统的不利影响是21世纪人类发展面临的重大问题之一。化石燃料燃烧产生的碳排放导致地球大气层中的二氧化碳浓度连续增加。因此,随之而来的全球变暖和气候变化已经成为全世界面临的严峻挑战 (Science 369 (2020) 392-396及Chem 6 (2020) 631-645)。碳捕获和利用(CCU)是减少二氧化碳排放到大气中的有效方法(Nature 575 (2019) 87-97)。以CO2为廉价易得的C1资源可催化制备多种高附加值产品,其中,CO2与环氧化物经环加成制备环碳酸酯具有高的原子经济性(~ 100%)。环碳酸酯应用前景广阔,可作为优良溶剂、电池电解液,也是合成可降解聚合物及药物、精细化学品的重要中间体,因而其合成具有重要实际价值。
迄今为止,各种不同的催化材料,如多孔有机高分子、共价有机骨架(COFs)、分子筛、金属有机骨架(MOFs)以及金属配合物、金属盐、季铵盐、离子液体等被用于二氧化碳合成环状碳酸酯,但往往需要高温、高压等较为苛刻的条件。
发明内容
本发明所要解决的技术问题是,克服现有技术存在的上述缺陷,提供一种双咪唑型氨基酸类离子液体及其制备方法与应用,所述双咪唑型氨基酸类离子液体可用作催化剂,在较温和的条件下制备环状碳酸酯。
通过采用上述技术方案,本发明提供了一种新型双咪唑型氨基酸类离子液体。
本发明双咪唑型氨基酸类离子液体的制备方法,在惰性气氛下,将N-甲基咪唑溶于乙腈中,搅拌均匀,逐滴加入二溴烷烃,在70-75 ℃回流反应36~48 h,减压蒸馏除去乙腈,加入极性相对较低的有机溶剂,搅拌,过滤,将滤液减压蒸馏除去有机溶剂,经干燥,得到双咪唑溴盐;将所述双咪唑溴盐溶于无水乙醇,加入KOH,在5-10 ℃反应8~12 h,过滤,直至KBr沉淀完全除去,加入组氨酸,80~85 ℃回流反应36~48 h,过滤除去过量的组氨酸,滤液经减压蒸馏、干燥,得到双咪唑型氨基酸类离子液体。
通过采用上述技术方案,可制备双咪唑型氨基酸类离子液体,方法简单、成本低、操作简便可控、易于放大。
优选地,原料摩尔比为,N-甲基咪唑∶二溴烷烃=2~2.2∶1~1.1,双咪唑溴盐∶KOH∶组氨酸=1~1.05∶1.2~1.25∶1.15~1.2。
通过采用上述技术方案,能够获得较高的收率。
优选地,所述极性相对较低的有机溶剂为乙酸乙酯、甲苯、丙酮、二氯甲烷中的一种或两种以上。
通过采用上述技术方案,能够取得较好的洗涤效果,采用其他洗涤效果较好的溶剂也是可行的。
优选地,所述的二溴烷烃为1, 4-二溴丁烷,1, 6-二溴己烷,1, 10-二溴癸烷,1,12-二溴十二烷中的一种或两种以上。
通过采用上述技术方案,能够制得对应的C4~12[mim]2BrHis。
优选地,所述惰性气氛为氮气气氛;干燥采用的方法为真空干燥。
通过采用上述技术方案,能在较低成本获得较好的保护或干燥效果。采用其他惰性气氛或干燥方法也是可行的。
本发明双咪唑型氨基酸类离子液体的应用,作为二氧化碳与环氧化物合成环状碳酸酯的催化剂。
通过采用上述技术方案,大幅度地减少了环碳酸酯的生产成本。
优选地,所述双咪唑型氨基酸类离子液体作为催化剂与环氧化合物混合,在二氧化碳压力为0.1~0.12 MPa,温度为40-80 ℃条件下,反应6 h以上。
通过采用上述技术方案,具有较好的催化效果。
优选地,所述双咪唑型氨基酸类离子液体与环氧化合物的摩尔比为0.5-3.0%,更优选1.5~2.5%。
通过采用上述技术方案,具有较好的催化效果。
优选地,所述环氧化合物为环氧氯丙烷、环氧溴丙烷,叔丁基缩水甘油醚,环氧丙基苯基醚,环氧苯乙烯中的一种或两种以上。
通过采用上述技术方案,具有较好的催化生产环碳酸酯的效果。对于其他结构相似的环氧化合物,所述双咪唑型氨基酸类离子液体也有较好的催化效果。
本发明以来自自然界的丰富、价廉的天然氨基酸制备的氨基酸离子液体,具有低毒性、优良生物相容性和溶解能力、易于生物降解等优点,将其用于CO2环加成合成环碳酸酯符合绿色碳科学及可持续发展的要求,将有利于提升离子液体吸收和转化CO2的性能,避免使用溶剂、助催化剂。基于氨基酸离子液体(AAIL)的多功能性及丰富的可设计性发展适于温和条件催化转化CO2为高附加值环状碳酸酯的新型绿色离子液体催化材料,克服以往离子液体催化转化CO2通常所需的苛刻条件,具有重要科学价值和工业应用前景。
本发明有益效果:
(1)本发明提供了一种新型双咪唑型氨基酸类离子液体;
(2)所述双咪唑型氨基酸类离子液体以来自自然界的价廉易得、绿色、具有多功能性的天然氨基酸即组氨酸制备,制备方法简单、成本低、操作简便可控、易于放大;
(3)将结构独特的多功能双咪唑型氨基酸离子液体作为新型催化材料应用于CO2与环氧底物环加成制备环状碳酸酯,与通常催化材料相比,本发明的CO2催化转化条件简便、易控、高效,避免外加溶剂、助剂,反应条件温和(0.1-0.12 MPa CO2压力,40-80 ℃),能耗低,因而大幅度地减少了环碳酸酯生产成本,而且不同侧链长度离子液体可以显著调控AAIL材料对CO2的转化性能,具有良好工业开发与应用前景。
附图说明
图1是本发明实施例3双咪唑氨基酸离子液体C10[mim]2BrHis的FT-IR图。
图2是本发明实施例3双咪唑氨基酸离子液体C10[mim]2BrHis的1H NMR图。
图3是本发明实施例5合成的氯代环状碳酸酯的1H NMR图。
图4是本发明实施例6双咪唑氨基酸离子液体C10[mim]2BrHis用量对催化环氧化物环加成效果影响的折线图。
图5是本发明实施例6双咪唑氨基酸离子液体C10[mim]2BrHis催化环氧化物环加成反应时间对效果影响的折线图。
图6是本发明实施例7合成的溴代环状碳酸酯的1H NMR图。
具体实施方式
以下结合实施例和附图对本发明作进一步说明。
本发明实施例所使用的原料,均通过常规商业途径获得。
实施例1
本实施例双咪唑侧链烷基为C4的氨基酸离子液体的制备方法:
在氮气的保护下,将N-甲基咪唑溶于30 mL乙腈溶液中,搅拌均匀,再逐滴加入1,4-二溴丁烷混合后(按摩尔比,N-甲基咪唑:1,4-二溴丁烷=2:1),70 ℃回流反应48 h,减压蒸馏除去乙腈,加入乙酸乙酯洗涤三次,搅拌,将滤液减压蒸馏,在80 ℃下真空干燥24 h,得到双咪唑溴盐;将其溶于30 mL无水乙醇溶液中,加入KOH,5-10 ℃低温反应8 h,过滤,直至KBr沉淀完全除去,继续加入组氨酸(按摩尔比,双咪唑溴盐:KOH:组氨酸=1:1.2:1.15),80 ℃回流反应48 h,过滤除去过量的组氨酸,滤液经减压蒸馏浓缩,70 ℃下真空干燥24h,得到中间烷基链为C4的双咪唑氨基酸离子液体。
实施例2
本实施例双咪唑侧链烷基为C6的氨基酸离子液体的制备方法:
在氮气的保护下,将N-甲基咪唑溶于30 mL乙腈溶液中,搅拌均匀,再逐滴加入1,6-二溴己烷混合后(按摩尔比,N-甲基咪唑:1,6-二溴己烷=2:1),70 ℃回流反应48 h,减压蒸馏除去乙腈,加入乙酸乙酯洗涤三次,搅拌,将滤液减压蒸馏,在80 ℃下真空干燥24 h,得到双咪唑溴盐;将其溶于30 mL无水乙醇溶液中,加入KOH后,5-10 ℃低温反应8 h,过滤,直至KBr沉淀完全除去,继续加入组氨酸(按摩尔比,双咪唑溴盐:KOH:组氨酸=1:1.2:1.15),80 ℃回流反应48 h,过滤除去过量的组氨酸,滤液经减压蒸馏浓缩,70 ℃下真空干燥24 h,得到中间烷基链为C6的双咪唑氨基酸离子液体。
实施例3
本实施例双咪唑侧链烷基为C10的氨基酸离子液体的制备方法:
在氮气的保护下,将N-甲基咪唑溶于30 mL乙腈溶液中,搅拌均匀,再逐滴加入1,10-二溴癸烷混合后(按摩尔比,N-甲基咪唑:1,6-二溴丁烷=2:1),70 ℃回流反应48 h,减压蒸馏除去乙腈,加入乙酸乙酯洗涤三次,搅拌,将滤液减压蒸馏,在80 ℃下真空干燥24h,得到双咪唑溴盐;将其溶于30 mL无水乙醇溶液中,加入KOH后,5-10 ℃低温反应8 h,过滤,直至KBr沉淀完全除去,继续加入组氨酸(按摩尔比,双咪唑溴盐:KOH:组氨酸=1:1.2:1.15),80 ℃回流反应48 h,过滤除去过量的组氨酸,滤液经减压蒸馏浓缩,70 ℃下真空干燥24 h,得到中间烷基链为C10的双咪唑氨基酸离子液体。C10[mim]2BrHis的红外光谱和核磁共振氢谱如图1、图2所示。
实施例4
本实施例双咪唑侧链烷基为C12的氨基酸离子液体的制备方法:
在氮气的保护下,将N-甲基咪唑溶于30 mL乙腈溶液中,搅拌均匀,再逐滴加入1,12-二溴十二烷混合后(按摩尔比,N-甲基咪唑:1,12-二溴十二烷=2:1),70 ℃回流反应48h,减压蒸馏除去乙腈,加入乙酸乙酯洗涤三次,搅拌,将滤液减压蒸馏,在80 ℃下真空干燥24 h,得到双咪唑溴盐;将其溶于30 mL无水乙醇溶液中,加入KOH后,5-10 ℃低温反应8 h,过滤,直至KBr沉淀完全除去,继续加入组氨酸(按摩尔比,双咪唑溴盐:KOH:组氨酸=1:1.2:1.15),80 ℃回流反应48 h,过滤除去过量的组氨酸,滤液经减压蒸馏浓缩,70 ℃下真空干燥24 h,得到中间烷基链为C12的双咪唑氨基酸离子液体。
实施例5
双咪唑氨基酸离子液体C4~12[mim]2BrHis催化环氧化物环加成:
双咪唑型氨基酸类离子液体作为催化剂,与环氧氯丙烷加入25 mL支口烧瓶中,混合后通入0.1 MPa CO2,于50 ℃反应6 h。催化剂加入量为9 mg(环氧氯丙烷用量的1.5 mol%)。反应结束后计算环状碳酸酯选择性和产率,结果汇总在表1中。所得的产物氯代环状碳酸酯的核磁共振氢谱图与理论值符合(如图3所示),证明得到了纯净的目标产物。
表1 双咪唑型氨基酸类离子液体催化二氧化碳与环氧化物合成环状碳酸酯的效果
催化剂 | C4[mim]2BrHis | C6[mim]2BrHis | C10[mim]2BrHis | C12[mim]2BrHis |
选择性% | 87 | 90 | 95 | 93 |
产率% | 29 | 65 | 75 | 75 |
含不同长度烷基链的双咪唑氨基酸离子液体对环氧化合物环加成反应都具有一定的催化效果;其中,含C10烷基链的双咪唑氨基酸离子液体(C10[mim]2BrHis)和环氧氯丙烷加入25 mL支口烧瓶中,混合后通入0.1 MPa CO2,于50 ℃反应6 h,催化剂加入量为9 mg(1.5 mol%)时,催化效果好。
实施例6
双咪唑氨基酸离子液体C10[mim]2BrHis催化环氧化物环加成的进一步研究:
(一)温度对反应的影响
将催化剂和环氧氯丙烷加入25 mL支口烧瓶中,混合后通入0.1 MPa CO2,如表2所示温度下反应14 h。催化剂的加入量为12 mg(环氧氯丙烷用量的2 mol% )。反应结束后计算氯代环状碳酸酯的选择性和产率,结果汇总在表2中。
表2 双咪唑氨基酸离子液体C10[mim]2BrHis在不同温度下的催化效果
温度℃ | 30 | 40 | 50 | 60 |
选择性% | 90 | 90 | 96 | 81 |
产率% | 51 | 82 | 95 | 80 |
(二)催化剂用量对反应的影响
将催化剂和环氧氯丙烷加入25 mL支口烧瓶中,混合后通入0.1 MPa CO2,催化剂的加入量为3、6、9、12、15 mg (0.5-2.5 mol%),反应温度为50 ℃,反应时间6 h。反应结束后计算氯代环状碳酸酯的选择性和产率,结果如图4所示。
(三)反应时间对反应的影响
将催化剂和环氧氯丙烷加入25 mL支口烧瓶中,混合后通入0.1 MPa CO2,反应时间为6-14 h,反应温度为50 ℃。催化剂的加入量为12 mg (2 mol%)。反应结束后计算氯代环状碳酸酯的选择性和产率,结果如图5所示。
综上,双咪唑氨基酸离子液体C10[mim]2BrHis催化环氧化物环加成,优选为:将催化剂和环氧氯丙烷加入25 mL支口烧瓶中,混合后通入0.1 MPa CO2,50℃,反应14 h,催化剂加入量为12 mg (2 mol%),所得产物氯代环状碳酸酯的产率达95%,核磁共振氢谱与理论的值符合,证明得到了纯净的目标产物。
实施例7
双咪唑氨基酸离子液体C10[mim]2BrHis催化不同环氧化物环加成:
将催化剂C10[mim]2BrHis和环氧化物加入25 mL支口烧瓶中,混合后通入0.1 MPaCO2,催化剂加入量为12 mg (2 mol%)。50-80 ℃下反应14 h,计算环状碳酸酯的选择性和产率,结果汇总在表3中。合成的溴代环状碳酸酯的核磁共振氢谱图如图6所示。
表3 双咪唑氨基酸离子液体C10[mim]2BrHis催化不同环氧化物环加成效果
Claims (10)
2. 如权利要求1所述的双咪唑型氨基酸类离子液体的制备方法,其特征在于,在惰性气氛下,将N-甲基咪唑溶于乙腈中,搅拌均匀,逐滴加入二溴烷烃,在70-75 ℃回流反应36~48 h,减压蒸馏除去乙腈,加入极性相对较低的有机溶剂,搅拌,过滤,将滤液减压蒸馏除去有机溶剂,经干燥,得到双咪唑溴盐;将所述双咪唑溴盐溶于无水乙醇,加入KOH,在5-10 ℃反应8~12 h,过滤,直至KBr沉淀完全除去,加入组氨酸,80~85 ℃回流反应36~48 h,过滤除去过量的组氨酸,滤液经减压蒸馏、干燥,得到双咪唑型氨基酸类离子液体。
3.根据权利要求2所述的双咪唑型氨基酸类离子液体的制备方法,其特征在于,原料摩尔比为,N-甲基咪唑∶二溴烷烃=2~2.2∶1~1.1,双咪唑溴盐∶KOH∶组氨酸=1~1.05∶1.2~1.25∶1.15~1.2。
4.根据权利要求2或3所述的双咪唑型氨基酸类离子液体的制备方法,其特征在于,所述极性相对较低的有机溶剂为乙酸乙酯、甲苯、丙酮、二氯甲烷中的一种或两种以上。
5. 根据权利要求2~4中任一项所述的双咪唑型氨基酸类离子液体的制备方法,其特征在于,所述的二溴烷烃为1, 4-二溴丁烷,1, 6-二溴己烷,1, 10-二溴癸烷,1, 12-二溴十二烷中的一种或两种以上。
6.根据权利要求2~5中任一项所述的双咪唑型氨基酸类离子液体的制备方法,其特征在于,所述惰性气氛为氮气气氛;干燥采用的方法为真空干燥。
7.如权利要求1所述的双咪唑型氨基酸类离子液体或权利要求2~6中任一项所述的双咪唑型氨基酸类离子液体的制备方法所得双咪唑型氨基酸类离子液体的应用,其特征在于,作为二氧化碳与环氧化物合成环状碳酸酯的催化剂。
8. 根据权利要求7所述的应用,其特征在于,所述双咪唑型氨基酸类离子液体作为催化剂与环氧化合物混合,在二氧化碳压力为0.1~0.12 MPa,温度为40-80 ℃条件下,反应6h以上。
9.根据权利要求7或8所述的应用,其特征在于,所述双咪唑型氨基酸类离子液体与环氧化合物的摩尔比为0.5-3.0%。
10.根据权利要求7~9中任一项所述的应用,其特征在于,所述环氧化合物为环氧氯丙烷、环氧溴丙烷,叔丁基缩水甘油醚,环氧丙基苯基醚,环氧苯乙烯中的一种或两种以上。
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