3-羟基-β-二氢大马酮的合成及在线热裂解研究
Synthesis of 3-hydroxy-β-damascone and its pyrolysis analysis
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摘要: 对3-羟基-β-二氢大马酮的合成及在线热裂解进行了研究.以异亚丙基丙酮、乙酰乙酸乙酯为原料,经Michael加成和Robinson环合得到2,6,6-三甲基-4-氧代-2-环己烯-1-羧酸乙酯;再经乙二醇缩酮化、水解、NaBH4还原得到2,6,6-三甲基-4-羟基-1-环己烯-1-羧酸乙酯;最后经与烯丙基锂反应得到目标产物3-羟基-β-二氢大马酮.对目标产物结构进行了GC-MS,IR,LC-ESI-MS,1H NMR,13C NMR表征.在线热裂解GC-MS,分析结果表明,3-羟基-β-二氢大马酮在300℃基本不裂解,在600℃,750℃,900℃能裂解出β-大马酮、异佛尔酮等重要烟草香味物质.
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关键词:
- 3-羟基-β-二氢大马酮 /
- 合成 /
- 热裂解
Abstract: The synthetic technology of 3-hydroxy-β-damascone and its pyrolysis analysis were performed.Firstly ethyl 2,6,6-trimethyl-4-oxo-2cyclohexene-1-carboxylate was obtained by reactions of Michael addition and Robinson cyclation with mesityl oxide and ethyl acetoacetate as starting materials,then it was ketalized with ethylene glycol,and was hydrolated and reduced by sodium borohydride to afford ethyl 2,6,6-trimethyl4-hydroxyl-cyclohexene-lcarboxylate,finally the obtained compound was coupled with allyllithium to give the title compound 3-hydroxyβ-damascone.The structure of 3-hydroxyβ-damascone was charactered by GC-MS,IR,LC-ESI-MS,1H NMR,and 13C NMR.The pyrolysis results of 3-hydroxy-β-damascone showed that it could hardly be pyrolyzed at 300℃,but could be pyrolyzed at 600℃,750℃,900℃ to produce β-damascenone,isophorone,etc,which are important flavoring comopositions in tobacco.-
Key words:
- 3-hydroxy-β-damascone /
- synthesis /
- pyrolysis
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