丙二烯

A commercial and practical synthesis rout with-2-(3-acetoxy-l-me-thyl-l~propenyl)-5,5-dimethyl-l,3-dioxane as starting material by couple,oxidation, Ramberg-Backlund and deprotection is chosen and studied in this paper.

本文选择了以2-(3-氯-1-甲基-1-丙烯)-5，5-二甲基-1，3-二噁烷为原料，经偶连、氧化、Ramberg-Bcklund反应及脱保护基四步反应的合成路线，对该中间体进行合成研究。

We prepared the pyrethric acid II through four reactions: esterification, oxidation, decomposition, diesterification. And the original synthesis route of the pyrethric acidII was improved: the yield of oxidation of allyl rise through increasing the activity of Selenium dioxide; in the document, tert-butyl-trans -2, 2-dimethy1-3-(2"-methoxycarbony1-1"-propenyl)cyclopropanecarboxy late was synthesized from tert-butyl-trans-2,2-dimethyl-3-(2 -formyl-r -propenyl) cyclopropanecarboxylate with two steps, with low yield.

我们经过酯化，氧化，成双酯，热分解四步反应，成功地得到了第二菊酸，并改进了原第二菊酸的合成路线：通过改变二氧化硒的活性提高了烯丙甲基的氧化产率；将原路线中醛氧化成羧酸、羧酸酯化的两步反应改为醛和甲醇、二氧化锰等作用一步直接酯化的方法，减少了反应步骤，提高了总收率。

In this paper the emulsion of polyacrylamide was synthesized in the polyglycol solutions, acryl amide and acrylic acid sodium was used as the monomer. In more detail, we investigated the effect of the concentration of the monomers, the ratio of monomer and PEG, the ratio of monomers, temperature, and emulsifier on the stability of the HPAM emulsion and the molecular weight of the HPAM.

为了提高聚丙烯酰胺相对分子质量，以丙烯酰胺与丙烯酸钠为原料，在聚乙二醇水溶液中合成了聚丙烯酰胺水包水乳液，考察了初始单体质量分数、共聚单体与聚乙二醇摩尔比、共聚单体摩尔比、聚合反应温度、乳化剂种类及其浓度对HPAM水包水乳液稳定性及相对分子质量的影响，所得共聚产物相对分子质量可达1.5×10^7。

Using N, N-dimethyl-ethylenediamine as cationic substitute and 2-hydroxyethyl methacrylate or allylamine as co-substitute, a kind of pH-sensitive polyorganophosphazenes bearing unsaturated side group was prepared.

以N，N-二甲基乙二胺为阳离子型取代基，甲基丙烯酸羟乙酯或烯丙胺为共取代基，制备了同时带有pH响应性侧基和不饱和双键侧基的聚膦腈。

The results indicated that the UV coatings made from epoxy acrylate resin/TPGDA monomer by the weight ratio of 80/20, and 3% dosage of benzil dimethyl ketal photoinitiator had an excellent films properties such as hardness, tensile strength, gloss and weatherability, while it possessed a poor impact resistance and adhesion of films.

试验结果发现，以预聚合体/单体比例为80/20、单体种类为二丙烯酸三丙烯乙二醇酯、光引发剂Benzil dimethyl ketal添加量为3%调配而成之UV涂料，其涂膜硬度、拉伸强度、光泽度及耐候性等性质优良，但涂膜耐冲击性、附著性不佳。

Hydrogels based on n -alkyl methacrylate esters,acrylic acid and acrylamide cross-linked with 4,4′-diazobenzene were preparared,and their deswelling kinetics was studied.

研究了甲基丙烯酸十二烷或丁酯、甲基丙烯酰胺及丙烯酸与4 ，4′-二偶氮苯交联共聚凝胶的消溶胀动力学。

A SPE procedure was suggested for extracting and concentrating fisetin by using different volume fractions of ethanol in aqueous solution as the loading conditions.

分别以中药黄栌的主要成分非瑟酮为印迹分子、丙烯酰胺为功能单体及乙二醇二甲基丙烯酸酯为交联剂，通过封管聚合法合成了分子印迹聚合物；将其装于自制的固相萃取柱中，研究了以不同体积比的乙醇-水溶液为溶剂时非瑟酮在柱上的保留行为；通过优化清洗及洗脱条件，使非瑟酮与它的结构相似物槲皮素在柱上得到了很好的分离。

A reversed-phase high performance liquid chromatographic method was established for determination of isothiocyanates in human urine , which used the reaction of propyl isothiocyanate with 1,2-benzenedithiol as reference instead of the synthesis of 1,3-benzodithiole-2-thione.

省去合成1，3 苯二硫杂环五烯 2 硫酮这一步骤，直接用异硫氰酸丙基酯与1，2 苯二硫酚反应作标准，建立了尿液中异硫氰酸酯的反相高效液相色谱测定方法。

In chapter four, molecular imprinting polymers against amino acid derivatives utilizing 2-VP+AM as combined functional monomer and trimethylolpropane trimethacrylate as tribasic cross-linker were prepared and result was compared with those with the same amino acid derivative as the imprinted molecules utilizing ethyleneglycol dimethacrylate as dibasic cross-linker. It was found that cross-link intensity of the molecular imprinting polymer is higher when TRIM was utilized and baseline separation for the imprinted molecule could be achieved. When TRIM was utilized as cross-linker more molecule is imprinted during the polymerization.

第四章采用2-乙烯基吡啶+丙烯酰胺复合功能单体，考察了三元交联剂三甲氧基丙烷三甲基丙烯酸酯烙印氨基酸衍生物的情况，并与二元交联剂乙二醇二甲基丙烯酸酯烙印相同氨基酸衍生物的情况进行了对比，发现三甲氧基丙烷三甲基丙烯酸酯交联剂在较小的用量下就可使分子烙印聚合物达到足够的交联度，实现烙印分子的基线分离。

It is important to use the best available water blended with not more than 60 percent ethylene glycol base antifreeze or 50 percent propylene glycol base antifreeze.

最重要的是要利用现有的水混合不超过60%或50%乙烯丙烯乙二醇防冻剂乙二醇基制药基地。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。