CN108238875A - 一种溴代异丁烯基甲醚的合成方法及其在c14醛的制备中的应用 - Google Patents
一种溴代异丁烯基甲醚的合成方法及其在c14醛的制备中的应用 Download PDFInfo
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- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 title claims abstract description 28
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000010189 synthetic method Methods 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims description 7
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 title 1
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 27
- -1 bromo isobutylaldehyde Chemical compound 0.000 claims abstract description 26
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 14
- NBBJYMSMWIIQGU-UHFFFAOYSA-N Propionic aldehyde Chemical compound CCC=O NBBJYMSMWIIQGU-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000007259 addition reaction Methods 0.000 claims abstract description 10
- STNJBCKSHOAVAJ-UHFFFAOYSA-N Methacrolein Chemical compound CC(=C)C=O STNJBCKSHOAVAJ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000005575 aldol reaction Methods 0.000 claims abstract description 8
- 238000003379 elimination reaction Methods 0.000 claims abstract description 8
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000003377 acid catalyst Substances 0.000 claims abstract description 6
- 238000006482 condensation reaction Methods 0.000 claims abstract description 5
- 229910000042 hydrogen bromide Inorganic materials 0.000 claims abstract description 3
- 150000001299 aldehydes Chemical class 0.000 claims description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- 239000007818 Grignard reagent Substances 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 5
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 claims description 4
- 150000002978 peroxides Chemical class 0.000 claims description 4
- MFRIHAYPQRLWNB-UHFFFAOYSA-N sodium tert-butoxide Chemical compound [Na+].CC(C)(C)[O-] MFRIHAYPQRLWNB-UHFFFAOYSA-N 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 3
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 3
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical group C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 3
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 3
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- 239000003456 ion exchange resin Substances 0.000 claims description 3
- 229920003303 ion-exchange polymer Polymers 0.000 claims description 3
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 3
- HHHSZBNXXGKYHH-UHFFFAOYSA-N 1-methoxy-2-methylprop-1-ene Chemical compound COC=C(C)C HHHSZBNXXGKYHH-UHFFFAOYSA-N 0.000 claims description 2
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 claims description 2
- 230000007062 hydrolysis Effects 0.000 claims description 2
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- QDRKDTQENPPHOJ-UHFFFAOYSA-N sodium ethoxide Chemical compound [Na+].CC[O-] QDRKDTQENPPHOJ-UHFFFAOYSA-N 0.000 claims description 2
- 244000248349 Citrus limon Species 0.000 claims 1
- 235000005979 Citrus limon Nutrition 0.000 claims 1
- 239000007858 starting material Substances 0.000 abstract description 2
- MOQGCGNUWBPGTQ-UHFFFAOYSA-N 2,6,6-trimethyl-1-cyclohexene-1-carboxaldehyde Chemical compound CC1=C(C=O)C(C)(C)CCC1 MOQGCGNUWBPGTQ-UHFFFAOYSA-N 0.000 description 4
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- 238000009835 boiling Methods 0.000 description 3
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- HIXDQWDOVZUNNA-UHFFFAOYSA-N 2-(3,4-dimethoxyphenyl)-5-hydroxy-7-methoxychromen-4-one Chemical compound C=1C(OC)=CC(O)=C(C(C=2)=O)C=1OC=2C1=CC=C(OC)C(OC)=C1 HIXDQWDOVZUNNA-UHFFFAOYSA-N 0.000 description 2
- QMMFVYPAHWMCMS-UHFFFAOYSA-N Dimethyl sulfide Chemical compound CSC QMMFVYPAHWMCMS-UHFFFAOYSA-N 0.000 description 2
- FPIPGXGPPPQFEQ-BOOMUCAASA-N Vitamin A Natural products OC/C=C(/C)\C=C\C=C(\C)/C=C/C1=C(C)CCCC1(C)C FPIPGXGPPPQFEQ-BOOMUCAASA-N 0.000 description 2
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- 230000015572 biosynthetic process Effects 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N dimethyl sulfoxide Natural products CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
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- DJYXWURRJNGQJM-UHFFFAOYSA-N 1-chloro-1-methoxy-2-methylprop-1-ene Chemical compound COC(=C(C)C)Cl DJYXWURRJNGQJM-UHFFFAOYSA-N 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- WTEVQBCEXWBHNA-UHFFFAOYSA-N Citral Natural products CC(C)=CCCC(C)=CC=O WTEVQBCEXWBHNA-UHFFFAOYSA-N 0.000 description 1
- 238000003476 Darzens condensation reaction Methods 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229930183419 Irisone Natural products 0.000 description 1
- AMIMRNSIRUDHCM-UHFFFAOYSA-N Isopropylaldehyde Chemical compound CC(C)C=O AMIMRNSIRUDHCM-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 238000007171 acid catalysis Methods 0.000 description 1
- UZFLPKAIBPNNCA-BQYQJAHWSA-N alpha-ionone Chemical compound CC(=O)\C=C\C1C(C)=CCCC1(C)C UZFLPKAIBPNNCA-BQYQJAHWSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000031709 bromination Effects 0.000 description 1
- 238000005893 bromination reaction Methods 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229940043350 citral Drugs 0.000 description 1
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- 238000004821 distillation Methods 0.000 description 1
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- WTEVQBCEXWBHNA-JXMROGBWSA-N geranial Chemical compound CC(C)=CCC\C(C)=C\C=O WTEVQBCEXWBHNA-JXMROGBWSA-N 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 150000005217 methyl ethers Chemical class 0.000 description 1
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical class CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- UEZVMMHDMIWARA-UHFFFAOYSA-M phosphonate Chemical compound [O-]P(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-M 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
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- 238000004321 preservation Methods 0.000 description 1
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- 238000007086 side reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
- C07C45/67—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton
- C07C45/68—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/01—Preparation of ethers
- C07C41/18—Preparation of ethers by reactions not forming ether-oxygen bonds
- C07C41/28—Preparation of ethers by reactions not forming ether-oxygen bonds from acetals, e.g. by dealcoholysis
-
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- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/48—Preparation of compounds having groups
- C07C41/50—Preparation of compounds having groups by reactions producing groups
- C07C41/56—Preparation of compounds having groups by reactions producing groups by condensation of aldehydes, paraformaldehyde, or ketones
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- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/42—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by hydrolysis
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- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
- C07C45/63—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by introduction of halogen; by substitution of halogen atoms by other halogen atoms
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- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F3/00—Compounds containing elements of Groups 2 or 12 of the Periodic Table
- C07F3/003—Compounds containing elements of Groups 2 or 12 of the Periodic Table without C-Metal linkages
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Abstract
本发明公开了一种溴代异丁烯基甲醚的合成方法,包括以下步骤:(1)甲醛与丙醛进行羟醛缩合反应,得到异丁烯醛;(2)步骤(1)得到的异丁烯醛与溴化氢进行加成反应,得到溴代异丁醛;(3)步骤(2)得到的溴代异丁醛与甲醇进行缩合反应,得到二甲氧基溴代异丁烷;(4)在酸催化剂的作用下,步骤(3)得到的二甲氧基溴代异丁烷与甲醇进行交换和消去反应,反应完全后经过后处理得到所述的溴代异丁烯基甲醚。该合成方法采用的起始原料价廉易得,可以有效地降低整个路线的成本;同时,采用了连续管道化反应,便于进行工业化应用。
Description
技术领域
本发明属于维生素制备领域,具体涉及一种溴代异丁烯基甲醚的合成方法及其在C14醛的制备中的应用。
背景技术
C14醛是合成维生素A的关键中间体之一,化工领域的工作人员对其合成方法进行了广泛的研究。目前,工业上合成C14醛的主要方法之一是以β紫罗兰酮为原料,经过Darzens缩合反应制备得到。该合成方法存在以下不足之处:(1)反应收率低,并且反应需在比较苛刻的条件进行。(2)反应副反应多,产物提纯困难。
此外,合成C14醛还有其他几种方法,如甲硫醚法和膦酸酯法等,然而甲硫醚法存在辅助试剂过于昂贵,使用危险的强碱DMSO钠盐等缺点,膦酸酯法则会产生大量的含磷废水,不够环保。
公开号为CN 105254479 A的中国专利公开了一种C14醛的合成方法,包括以下步骤:(1)以环柠檬醛为原料,与氯代异丁烯基甲醚格氏试剂缩合制得C14烯醚羟基物;(2)在酸催化下同时水解羟基成烯烃以及烯醚得到C14醛。该发明路线简洁,不必经过β-紫罗兰酮中间体,从环柠檬醛直接缩合得到,产物的收率和纯度有一定的改善。然而该合成方法的收率和纯度还不够高,有一定的提升空间,并且所使用的原料氯代异丁烯基甲醚不易制备,工业化难度较高。
发明内容
本发明提供了一种溴代异丁烯基甲醚的合成方法及其在C14醛的制备中的应用,该合成方法所用的原料价廉易得,各个步骤反应收率高,便于工业化生产。
一种溴代异丁烯基甲醚的合成方法,包括以下步骤:
(1)甲醛与丙醛进行羟醛缩合反应,得到异丁烯醛;
(2)步骤(1)得到的异丁烯醛与溴化氢进行加成反应,得到溴代异丁醛;
(3)步骤(2)得到的溴代异丁醛与甲醇进行缩合反应,得到二甲氧基溴代异丁烷;
(4)在酸催化剂的作用下,步骤(3)得到的二甲氧基溴代异丁烷与甲醇进行交换和消去反应,反应完全后经过后处理得到所述的溴代异丁烯基甲醚。
具体反应路线如下:
本发明通过采用甲醛和丙醛作为起始原料,依次经过羟醛缩合反应、加成反应、缩合反应、交换和消去反应得到了溴代异丁烯基甲醚,各个步骤操作简单,收率较高,便于实现工业化生产,同时,得到的产物可以用于合成C14醛,可以有效地降低维生素A的生产成本。
作为优选,步骤(1)中,所述的羟醛缩合反应在碱性催化剂的作用下进行;
所述的碱性催化剂为氢氧化钠、甲醇钠、乙醇钠或者叔丁醇钠。
作为优选,步骤(1)中,所述的羟醛缩合反应在管道反应器中进行,反应温度为180-280℃,反应压力10-20MPa。
步骤(2)中,所述的加成反应为自由基反马氏加成反应,反应在过氧化物的作用下进行;
所述的过氧化物为过氧化苯甲酰。
作为优选,步骤(2)中,所述的加成反应的温度为40~60℃。
作为优选,步骤(3)中,所述的缩合反应在强酸的催化下进行;
所述的强酸为浓硫酸或强酸性离子交换树脂。
酸催化剂的种类会对交换和消去反应效果产生较大的影响,作为优选,步骤(4)中,所述的酸催化剂为对甲基苯磺酸。
作为优选,步骤(4)中,所述的交换和消去反应在管道式反应器中进行,反应温度为200~250℃,停留时间为1~10分钟。
本发明还提供给了一种C14醛的制备方法,包括以下步骤:
(A)按照所述的方法合成溴代异丁烯基甲醚;
(B)将所述的溴代异丁烯基甲醚转化为溴代异丁烯基甲醚格氏试剂,然后再与环柠檬醛发生加成反应,反应结束后经过水解和消去反应得到所述的C14醛。
采用该新的中间体用于合成C14醛时,能够有效地提高产品纯度和收率。
同现有技术相比,本发明的有益效果体现在:本发明的合成路线所采用的起始原料价廉易得,可以有效地降低整个路线的成本;同时,采用了连续管道化反应,便于进行工业化应用。
具体实施方式
实施例1异丁烯醛制备
称取85.7g(1.0mol)的35%的甲醛水溶液,60.9g(1.05mol)丙醛和0.1克氢氧化钠作催化剂,在温度220℃,压力15MPa下进行管道反应,反应60秒后冷却至室温,取出生成物,分层,将上层油层和下层水层分别进行常压蒸馏,收集68~70℃之间的馏分,得到异丁烯醛,产量(63)g,产率90%,纯度98%。
实施例2溴代异丁醛制备
称取按照实施例1的方法得到的异丁烯醛70g(1.0mol),溶解在200克正己烷中,加入0.5g的过氧化苯甲酰,搅拌条件下通溴化氢气体,在50℃下反应3.0小时,过滤,即得到溴代异丁醛,产量(120.6)g,产率80%,纯度98%。
实施例3二甲氧基溴代异丁烷制备
称取按照实施例2的方法得到的溴代异丁醛151g(1.0mol)和甲醇1000g在10克732型强酸性离子交换树脂催化下进行。在甲醇回流温度下反应5小时,反应毕,过滤催化剂,回收甲醇和产生的少量水,即得到二甲氧基溴代异丁烷,产量163克,含量92%,收率76.1%。
实施例4溴代异丁烯醚制备
将二甲氧基溴代异丁烷197克(1mol)溶解在1000克甲醇中,配置成质量浓度为10%的溶液,并加入0.1克对甲基苯磺酸,通过计量泵输入管道反应装置,控制反应温度230℃,停留时间1分钟,将反应液回收,得到溴代异丁烯甲醚130克,含量90%,收率71%,ESI-MS m/z:164.8(M+H)+,calcd for C5H9BrO:163.98。
实施例5C14醛制备
将36.5克(1.1mol)镁粉置于四口烧瓶中,加入300ml四氢呋喃,强烈搅拌,温度升至66℃,同时称取165克(1.0mol)溴代异丁烯基甲醚溶解在300ml四氢呋喃中,缓慢滴加进烧瓶中,观察四氢呋喃沸腾情况,待看见烧瓶内产生大量泡沫视为引发成功,随即将水浴温度降至40℃对反应体系进行降温,保持烧瓶内反应在微沸状态进行,待溴代异丁烯基甲醚滴毕,将温度升至50℃继续保温2.0小时
将制取好的溴代异丁烯基甲醚格氏试剂冷至-15℃,称取122克(0.8mol)环柠檬醛溶解在100ml甲苯中,滴加至溴代异丁烯基甲醚格氏试剂中,保持温度在10℃左右,在1.0小时内滴完,升温至30℃保温反应4.0小时,加入30%硫酸300ml进行水解反应,回收溶剂。得粗油156.2克,含量90.3%,折纯收率85.3%,该产物通过HPLC与标准品进行对照,保留值一致。
Claims (9)
1.一种溴代异丁烯基甲醚的合成方法,其特征在于,包括以下步骤:
(1)甲醛与丙醛进行羟醛缩合反应,得到异丁烯醛;
(2)步骤(1)得到的异丁烯醛与溴化氢进行加成反应,得到溴代异丁醛;
(3)步骤(2)得到的溴代异丁醛与甲醇进行缩合反应,得到二甲氧基溴代异丁烷;
(4)在酸催化剂的作用下,步骤(3)得到的二甲氧基溴代异丁烷与甲醇进行交换和消去反应,反应完全后经过后处理得到所述的溴代异丁烯基甲醚。
2.根据权利要求1所述的溴代异丁烯基甲醚的合成方法,其特征在于,步骤(1)中,所述的羟醛缩合反应在碱性催化剂的作用下进行;
所述的碱性催化剂为氢氧化钠、甲醇钠、乙醇钠或者叔丁醇钠。
3.根据权利要求1所述的溴代异丁烯基甲醚的合成方法,其特征在于,步骤(1)中,所述的羟醛缩合反应在管道反应器中进行,反应温度为180-280℃,反应压力10-20MPa。
4.根据权利要求1所述的溴代异丁烯基甲醚的合成方法,其特征在于,步骤(2)中,所述的加成反应在过氧化物的作用下进行;
所述的过氧化物为过氧化苯甲酰。
5.根据权利要求1所述的溴代异丁烯基甲醚的合成方法,其特征在于,步骤(2)中,所述的加成反应的温度为40~60℃。
6.根据权利要求1所述的溴代异丁烯基甲醚的合成方法,其特征在于,步骤(3)中,所述的缩合反应在强酸的催化下进行;
所述的强酸为浓硫酸或强酸性离子交换树脂。
7.根据权利要求1所述的溴代异丁烯基甲醚的合成方法,其特征在于,步骤(4)中,所述的酸催化剂为对甲基苯磺酸。
8.根据权利要求1所述的溴代异丁烯基甲醚的合成方法,其特征在于,步骤(4)中,所述的交换和消去反应在管道式反应器中进行,反应温度为200~250℃,停留时间为1~10分钟。
9.一种C14醛的制备方法,其特征在于,包括以下步骤:
(A)按照权利要求1~8任一项所述的方法合成溴代异丁烯基甲醚;
(B)将所述的溴代异丁烯基甲醚转化为溴代异丁烯基甲醚格氏试剂,然后再与环柠檬醛发生加成反应,反应结束后经过水解和消去反应得到所述的C14醛。
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