共查询到17条相似文献,搜索用时 437 毫秒
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相转移催化法合成乙基香兰素的工艺改进 总被引:1,自引:0,他引:1
以邻苯二酚为原料,首先合成中间体邻乙氧基苯酚,然后以十六烷基三乙基溴化铵为相转移催化剂合成了乙基香兰素,考察了相转移催化剂的选择及反应温度,最后收率为55.2%。 相似文献
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相转移催化法合成乙基香兰素的研究 总被引:6,自引:0,他引:6
乙基香兰素是一种非常重要的香料,具有强烈的香子兰香气及甜的味道。本文首次报道了相转移催化法合成乙基香兰素的研究,并初步得出了相转移催化法合成乙基香兰素的最佳条件。 相似文献
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乙基香兰素的相转移催化合成 总被引:2,自引:0,他引:2
报道了应用相转移催化技术合成中间体邻乙氧基苯酚及最终产物乙基香兰素,考察了反应温度、时间、物料配比等因素对合成的影响,确定了最佳反应条件,邻乙氧基苯酚反应的最佳温度60℃;合成乙基香兰素最佳温度55~60℃。研究结果显示聚乙二醇作为相转移催化剂合成邻乙氧基苯酚,四丁基溴化胺相转移催化合成乙基香兰素,其结果均优于以往报道,邻乙氧基苯酚最高收率可达75.5%,乙基香兰素最高收率可达70%。 相似文献
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乌洛托品法合成乙基香兰素工艺研究 总被引:1,自引:0,他引:1
乌洛托品法是合成惭基香兰素的一种重要方法,它操作简单,原料易得,产率较高。本文就乌洛托品法合成乙基香兰素的各种因素对实验结果的影响进行了详尽的研究,同时应用一种金属氧化物作为反应的催化剂,提高了产率,降低了成本,有利于工业化生产。 相似文献
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为解决乙基香兰素在提纯精制过程中因高温导致的热分解或聚合引起质量下降及收率降低的难题,采用分子蒸馏技术研究提纯精制乙基香兰素的低温工艺。实验中考察了压力、蒸馏温度、进料状态(温度、流速)及刮膜器的转速对乙基香兰素分离效率的影响。研究结果表明,蒸馏温度和进料速率是影响乙基香兰素纯度的2个最重要因素;适宜的工艺条件是:压力4 Pa,蒸馏温度85—90℃,进料速率120 mL/h及刮膜器转速120—140 r/m in。粗品只进行二级分子蒸馏,即可获得纯度>99%的乙基香兰素;乙基香兰素的收率提高3%—5%。 相似文献
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分别对香兰素的化学合成法、提取法、生物合成法进行了阐述,不仅详细给出了合成的主要原材料、反应过程,而且对每种方法的优缺点进行了系统分析,并提出了自己的观点,以期为香兰素的进一步研究提供参考。 相似文献
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Olsson PO Anderbrant O Löfstedt C Borg-Karlson AK Liblikas I 《Journal of chemical ecology》2005,31(12):2947-2961
Volatiles from chocolate mediate upwind flight behavior in Ephestia cautella and Plodia interpunctella. We used gas chromatography with electroantennographic detection and found 12 active compounds derived from three different
chocolate types, i.e., plain, nut-containing, and rum-flavored. Eight of the compounds were identified with mass spectrometry,
and the activity of three compounds, ethyl vanillin, nonanal, and phenylacetaldehyde (PAA), was subsequently confirmed in
both electrophysiological and behavioral assays. In the electroantennogram experiment, PAA and nonanal were consistently eliciting
responses in both species and sexes. Ethyl vanillin was active in males of both species, and also in P. interpunctella females. E. cautella females showed no antennal activity in response to ethyl vanillin. All three volatiles were attractive to E. cautella males and P. interpunctella females in a flight tunnel. E. cautella females were significantly attracted only to ethyl vanillin. P. interpunctella males were attracted to PAA. Ethyl vanillin is a novel insect attractant, whereas both nonanal and phenylacetaldehyde mediate
behavior in many insect species. A final experiment revealed that a blend of the three volatiles was required to induce landing
in the flight tunnel bioassay, and that the landing rate was dependent on dose. The three-component blend attracted both sexes
of P. interpunctella and females of E. cautella, whereas E. cautella males were not attracted. 相似文献