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乙酯

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Phenylethyl cinnamate was synthesized from cinnamic acid with β-phenylethyl alcohol using ultra stable Y zeolite supported silicotungstic acid as catalysts without solvent under microwave irradiation.

在微波辐射下,以超稳Y沸石负载硅钨酸为催化剂,不使用溶剂,合成了肉桂酸β-苯乙酯

The repellent action and contact action of the extracts of 21 species of plants to adult maize weevil, Sitophilus zeamais Motschulsky were studied.

为了筛选对粮库安全的植物源杀虫剂,研究了21种植物的4种溶剂(无水乙醇、丙酮、乙酸乙酯和石油醚)提取物对玉米象Sitophilus zeamais Motschulsky的驱避和触杀作用。

Based on increasing resistance of stored grain insect pest to chemicals and decreasing fumigants, the effects of ethyl formate on eggs, early larvae, late larvae, pupae and adults of Sitophilus oryzae were systematically studied with the sealed jar fumigation method under different conditions.

针对储粮害虫抗药性日趋严重、粮食熏蒸剂品种越来越少的现状,采用密闭熏蒸法,系统研究甲酸乙酯在不同条件下对米象Sitophilusoryzae卵、低龄幼虫、高龄幼虫、蛹以及成虫的致死作用。

Reaction was carried out in a Soxhlet extracting set. Various reactionparameters were also examined.

对影响3-羟基丁酸乙酯收率的诸因素进行了考察。

MethodsThe ethyl acetate fractions from MeOH extracts of the spermoderm of Xanthoceras sorbifolia were partitioned and purified by means of several separation methods.

方法采用多种分离技术对文冠果种皮甲醇提取物的醋酸乙酯部位分离纯化,根据其理化性质和光谱数据进行结构鉴定。

Reduction of N-substituted-4-nitrophthalimides(1)to the corresponding amines(2)was performed in hydrochloric acid at 40 ℃ using stannous chloride as reduction agent, yielding produc...

氮气保护条件下,2与乙醇在固体光气作用下生成(2 取代 1,3 二酮 2,3 二氢 1H 异吲哚 5 )氨基甲酸乙酯(3),3的产率为67%~92%。各化合物的结构均经1H NMR、IR、元素分析和FAB MS证实。

The silica MSU-X type mesoporous molecular sieves were synthesized by using the polyoxyethylene stearyl ether (C18EO10) as template, the tetraethyl orthosilicate and sodium silicates as silica source, respectively.

以十八烷基聚氧乙烯醚(C18EO10)为模板剂,以正硅酸乙酯和硅酸钠分别为硅源,研究了不同pH值、反应温度、反应时间、原料比等条件下,合成的全硅MSU-X型介孔分子筛产物的结构变化规律,并通过焙烧和水热处理,考察了MSU-X介孔材料的结构稳定性。

Described in chapter 3 is the immediate application of the Clemmensen reductive rearrangement reaction to the polycyclic system as illustrated in a elaboration of the 5-6-7 tricyclie core skeleton of Stemona alkaloids in 5 steps: N-alkylation, [3, 2] -sigmatropic rearrangement, Dieckmann condensation, oxidative cyclization, reductive rearrangement, starting from ethyl pipecolinate hydrochloride.

我们以哌啶酸乙酯为起始原料,经氮烷基化,[3,2]-σ重排,Dieckmann缩合,自由基环化,6-6-6元环系到5-6-7元环系的还原重排五步反应,高收率地构筑了百部生物碱的5-6-7氮杂三环骨架,并用X射线晶体衍射法确定了其结构。

Meanwhile, the steric effects of alcohol seemed to be a certain factor.

对托品酸乙酯在CTB手性固定相上反相手性识别机理进行了讨论。

Water-based resin approximately150, such as Rosin monomaleate monomaleate, styryl, acrylic copolymer resins, such as aminosulfonic ethylacrylate, emulsio, that is, there is a water-based dispersion resins, vinyl acetate copolymer, acrylic copolymer, polyurethane resin, epoxy resin, etc.

水性树脂的种类很多,如松香马来酸树脂、苯乙烯马来酸树脂、丙烯酸共聚物、氨基丙烯酸乙酯等,高分子乳液,即水性分散树脂,有醋酸乙烯共聚物、丙烯酸共聚物、聚氨酯树脂、环氧树脂等。

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