脱氢芳樟醇合成柠檬醛

柠檬醛是合成紫罗兰酮类香料以及合成维生素A，E等医药化工产品的重要中间体，在选择聚钒有机硅氧烷为主催化剂，并在一定的助催化剂作用下，以石蜡油为有机溶剂，在氮气保护下，对脱氢芳樟醇合成柠檬醛的反应工艺条件进行了探讨。反应结束后反应液经过真空蒸馏后得到产物，并通过GC－MS进行定性和定量分析。结果表明，适宜的催化剂原料配比为二苯基二氯硅烷：正钒酸钠为3：1；适宜的经剂焙烧温度为100℃，反应温度为170℃，反应时间为4小时。通过实验我们初步得到了使产品的产率为80％，纯度为90％的工艺条件。并对该催化剂的催化反应机理作了简单解释。     

我国天然柠檬醛的利用及鸢尾酮的合成进展

我国富含柠檬醛的山苍子油资源丰富 ,每年出口约 2 0 0 0t,在世界香料市场占有特殊的地位。为了改变该资源低值单调的利用途径 ,系统地总结和评述了山苍子油半合成高档香料———鸢尾酮以及多方面综合利用的研究进展 ,阐明了将我国天然柠檬醛的资源优势转化为可持续发展的经济优势的重要意义 ,提出了以栽培种植为基础、以半合成鸢尾酮系列香料为主导、以环境友好和高效综合利用为目的的产业化模式     

甲基紫罗兰酮的合成

研究了以固载强酸TiO2/SO2-4做催化剂,用假性异甲基紫罗兰酮合成甲基紫罗兰酮的方法。提高了α 异甲基紫罗兰酮的收率,获得了最佳反应条件:投料比n(假性异甲基紫罗兰酮)∶n(二甲苯)∶n(硫酸)=1∶3 5∶0 05,控制反应温度15～25℃,反应时间1 5h。该优化条件下,合成收率为92%～93%,产物中α 异甲基紫罗兰酮质量分数为77%左右。     

Hydrogenation of Citral Over a Polymer Fibre Catalyst

A polymer-supported Pd catalyst was investigated in hydrogenation of citral (3,7-dimethyl-2,6-octadienal), which is a stereoisomer with an isolated and a conjugated double bond as well as a carbonyl group. The catalyst was a fibrous polymer-supported catalyst modified with functional groups and immobilized metals. A comparison of the polymer-supported catalyst with conventional catalysts was made.     

Synthesis of Pseudoionones by Acid and Base Solid Catalysts

The preparation of pseudoionones by aldol condensation reaction between citral and acetone have been carried out in the presence of acid (HY and beta zeolites), an acid–base (amorphous aluminophosphate) and basic catalysts such as an aluminophosphate oxynitride, MgO and different activated hydrotalcites. The results showed that acid or acid–base catalysts were not successful for performing in one pot the preparation of ionones. MgO and calcined hydrotalcites showed excellent activity and selectivity to pseudoionones, with calcined hydrotalcite more selective than MgO. Moreover, the rate of reaction can be improved by activating the hydrotalcite through rehydration. This activation can be successfully done by simply adding the optimum amount of water to the calcined hydrotalcite before reaction. The inhibiting effect of the concentration citral on the catalytic activity of rehydrated hydrotalcites that has been reported to occur at 273 K can be avoided by working at a reaction temperature of 333 K.     

香料紫罗兰酮合成工艺研究

以山苍子油、柠檬草油为原料合成紫罗兰酮,研究了缩合反应、环化反应、产品精制的工艺条件;并缩合反应中,柠檬醛的转化率为99%以上,产品得率95%;环化反应中,假性紫罗兰酮的转化率98%以上,产品得率90%。产品中总含酮量95%,其中α-紫罗兰酮占80%。     

Chemistry of mandibular and Dufour's gland secretions of ants in genusMyrmecocystus

Males of several species ofMyrmecocystus produce mandibular gland secretions that contain 2,4-dimethyl-2-hexenoic acid and a variety of monoterpenes that include neral, geranial, citronellol, limonene, and 2,6-dimethyl-5-hepten-1-ol. Other components identified include methyl anthranilate, octanal, octanol, octyl octanoate, and 2-hexyl-2-decenal. Methyl salicylate has been identified as a mandibular gland constituent of workers of several species in addition to mellein and monoterpenes such as cymene, limonene, and the isomers of citral. The Dufour's gland secretions of workers and females of 14 species contain typical formicine alkanes (e.g., undecane), 2-alkanols (e.g., 2-tridecanol), and 2-alkanones (e.g., 2-tridecanone). Two species in the subgenusEremnocystus produce secretions that are distinguished by the presence of significant quantities of tridecyl esters. The functions of these compounds as well as their possible chemosystematic significance in the genusMyrmecocystus are discussed.     

广西产山苍子油的GC-MS分析

利用GC MS联用仪 ,对广西产山苍子油进行了分析 ,共分离出 37个峰 ,鉴定了其中 31个化学成分 ,占总含量的 94 .15 %。其主要成分为α 柠檬醛、β 柠檬醛、柠檬烯、甲基庚烯酮、β 芳樟醇、月桂烯、α 蒎烯、β 蒎烯、α 松油醇、桧烯、β 石竹烯等。并对三个产地不同的样品进行了比较     

减压精馏山苍子油提高柠檬醛含量的研究

研究探索了旨在提高柠檬醛含量的山苍籽油减压精馏的条件，取得了令人满意的结果。     

D-72磺酸树脂催化柠檬醛环化合成对伞花烃

以D-72磺酸树脂为催化剂,催化柠檬醛环化反应合成对伞花烃,考察了反应介质、柠檬醛的体积分数、催化剂用量、反应温度和反应时间对柠檬醛转化率和对伞花烃产率的影响。实验结果表明,以乙酸乙酯为介质,在柠檬醛体积分数为7.5%,催化剂用量为0.4 g,70℃下反应80 min,柠檬醛的转化率为100%,对伞花烃的产率为73.65%。