环二酯

The second reaction we tested was diastereoselective Michael-Aldol annulation of -keto ester 121 with methacrolein to give a key intermediate for synthesizing (--Huperzine A.

通过对反应条件的筛选，我们得到的最好的结果是以-乳酸苄酯为手性辅基的β-酮酯121i为底物，以(1R， 2R)-环己二胺衍生的手性胍85i为催化剂，以无水四氢呋喃为溶剂，在-20℃反应，得到的产物的de值为73.2%。

The common chemical constituents were juniper camphor,1,3,3-trimethylcyclohex-1-ene-4-carboxaldehyde,borneol,α-curcumene,α-bisabolol,cis-caryophyllene,benzyl benzoate,methyl β,β-dimethylbenzenepropanoic acid ester,2,4-decadienal and heneicosane in the essential oil of the five cultivars' Hangjuhua.Among them,juniper camphor is most which were composed of 11.96%,10.51%,10.95%,13.28% and 10.77% of the total essential oil,and methyl β,β-dimethylbenzenepropanoic acid ester is second,which were composed of 1.51%,1.86%,2.52%,4.89% and 2.51% of the total essential oil,respectively.

5种栽培类型杭菊花挥发油中共有成分为1，3，3-三甲基环己-1-烯-4-甲醛、冰片、α-姜黄烯、α-甜没药萜醇、顺式石竹烯、桧脑、安息香酸苄酯、β，β-二甲基苯丙酸甲酯、2，4-癸二烯醛和二十一烷；其中桧脑含量最高，分别占挥发油总量的11.96%，10.51%，10.95%，13.28%和10.77%，为5种栽培类型杭菊花挥发油中最具特征的成分；其次是β，β-二甲基苯丙酸甲酯，分别占挥发油总量的1.51%，1.86%，2.52%，4.89%和2.51%。

Aqua、Butylene Glycol、Dimethicone、Cyclomethicone、Glycerin And Glyceryl Acrylate/Acrylic Acid Copolymer And Propylene Glycol And PVM/MA Copolymer、Hydrolyzed Adansonia Digitata Extract、Commiphora Myrrha Extract、Hydrolyzed Callogen、Carbomer、Triethanolamine、Allantoin、Elastin 、Diazolidinyl Urea、Fragrance .

水、丁二醇、聚二甲基硅氧烷、环聚二甲基硅氧烷、甘油和甘油丙烯酸酯/丙烯酸共聚物和丙二醇和PVM /MA共聚物、水解猴面包树提取物、没药提取物、水解胶原、卡波姆、三乙醇胺、尿囊素、弹性蛋白、双咪唑烷基脲、香精。

Under high dilution,the cross-coupling reactions of 4,5-dicyano-1,3-dithiol-2-one(6) and dithia crown-ether annulated tetrathiafulvalenes(3a～3c) in toluene gave asymmetrical dicyano tetrathiafulvalene derivatives(7a～7c) in the presence of triethyl phosphite.The compounds 7a～7c were characterized by(~1HNMR,EA,MS and IR.

在甲苯溶液中，在亚磷酸三乙酯存在下，采取高度稀释的方法，使4，5-二氰基-1，3-二硫杂环戊二烯-2-酮分别和多缩硫杂冠醚进行交叉偶联反应，成功地得到了不对称的2，3-二氰基四硫富瓦烯衍生物。

In this dissertation, I will represent my studies on the nitration of Chalcone derivatives, reaction of epoxide ketone, and the aromatization of 3,5-disubstitued 2-isoxazolines with nitric oxide.

本文主要研究了：(1)NO与查尔酮及其衍生物的硝化反应，反应以较高的产率得到了a-硝基化合物；(2)NO对环氧酮的开环反应，反应生成了顺式羟基硝酸酯；(3)3，5-二取代的-2-异恶唑啉在NO作用下可以发生芳环化反应，生成了对应的2-异恶唑化合物。

In order to achieve a rapid and accurate selection for extractive distillation solvent, and to acquire 1,2,3-trimethylbenzene with high purity from solvent oil via extractive distillation, the UNIFAC model was used to calculate the relative volatility of 1,2,3-trimethylbenzene to indane (the mass ratio of 1,2,3-trimethylbenzene to indane is 4∶1) in five different solvents, acetophenone, di-2-octylhexyl phthalate, glycol, dimethyl sulfoxide,sulfolane at 17.47 kPa.

为了快速准确地选择萃取精馏溶剂，由190#溶剂油萃取精馏获取高纯度连三甲苯，运用UNIFAC模型，计算了质量比为4∶1的连三甲苯-茚满体系在苯乙酮、乙二醇、邻苯二甲酸二辛酯、二甲基亚砜和环丁砜5种溶剂中在17.47 kPa下的相对挥发度。

In this paper,pyromellitic dianhydride,1,2,3,4-cyclobutanetetracarboxylic dianhydride,4[(4-aminophenyl)-bis(4-methoxyphenyl)methyl]benzeneamine,4-hexyloxy-biphenyl-3′,5′-diaminobenzoate,and additive ADD-34 were used to synthesize four PIs.

文章用均苯四甲酸二酐，4[(4-氨基苯基)-二(4-甲氧基苯基)甲基]苯胺，1，2，3，4-环丁烷四羧酸二酐，4-己烷氧基联苯酚-3′，5′-二胺基苯甲酸酯和不同含量的添加剂制备了聚酰亚胺液晶取向剂。

The result showed that the thermal decomposition temperature of chlorinated paraffin reached 133℃ by adding 0.3% composite stabilizer in which the weight percentages of ethylene glycol diglycidyl ether, methyl stannic, triphenyl phosphate, exoxidized soybean oil were 72%, 3%, 10%, 15%, respectively. It is 15℃ more than that of using pure ethylene glycol diglycidyl ether.

结果表明：当复合稳定剂中乙二醇二缩水甘油醚、甲基锡、亚磷酸三苯酯、环氧大豆油的质量分数分别为72%，3%，10%，15%，复合稳定剂的添加量为氯化石蜡的0.3%时，氯化石蜡的热分解温度为133℃，比单独使用乙二醇二缩水甘油醚提高了15℃，热稳定效果较好。

Two new active esters of acrylic acids monomers, N-p-acryloxybenzoyloxy succini-mide and N-p-methacryloxybenzoyloxy succinimide have been synthesized and polymerized.ABOSu and MBOSu were prepared by coupling of p-acryloxybenzoic acid or p-methacryloxybenzoie acid with N-hydroxy succinimide in the presence of dicyclohexylcarbodimide.

新的丙烯酸活性酯，N-(对甲基丙烯酰氧苯甲酰氧基)丁二酰亚胺及N-丁二酰亚胺单体分别由对甲基丙烯酰氧基苯甲酸、对丙烯酰氧基苯甲酸与N-羟基丁二酰亚胺在环已基羰二亚胺存在下经偶联反应合成。

Bromo-2-sulfolene (2) reacted with substituted benzoic acid salt s 3a～3c or alizarin yellow (3d) to give four novel allylic substitution products 4a～4d by esterification reaction, respectively.

以3，4-二溴环戊砜(1)为原料，在无水吡啶作用下发生消除反应，得到反应中间体4-溴-2-环戊烯砜(2)，再分别与一系列取代苯甲酸盐3a～3c以及茜素黄GG(3d)发生酯化反应，合成出4种新环戊烯砜衍生物4a～4d，并用IR，1HNMR，MS，元素分析等表征了它们的结构。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。