烯基

It was applied to analyze the structures of ashless dispersants and their derivatives. The results were obtained and correlated. The molecular weight distribution and dipersity of ashless dispersant, number of polyisobutene R and polymeric degree of R polymerism in addition agent were obtained.

以Ultrastyragel为固定相，四氢呋喃作流动相，用普适标准校正曲线及凝胶渗透色谱法对无灰分散剂及其对应衍生物的结构进行了分析测定，并将测定结果相关联，计算出了无灰分散剂的相对分子质量分布、分散度及添加剂所含聚异丁烯R基的个数及R基聚合度。

Catalysts in three synthesis routes,the hydroxylation of 4-tert-butyl-phenol,the alkylation of pyrocatechol by tert-butyl alcohol and the alkylation of pyrocatechol by isobutene,were discussed in detail in terms of reaction conditions,catalysts,temperature,reaction time etc.

论述了对叔丁基苯酚羟基化法、邻苯二酚与叔丁醇烷基化法和邻苯二酚与异丁烯烷基化法生产对叔丁基邻苯二酚的合成路线的催化剂。

Synthesis, spectral and structural studies of isomerized products of isopreneiron complexes and crystal structure of tetracarbonyl ethoxypentachloroph

异戊二烯二羰基铁配合物的异构化产物的合成，波谱和结构研究及四羰基铁的晶体结构

Thus, the corresponding chiral sulfonium ylide was designed and its precursor was found to be readily available from the coresponing sulfide that was easily prepared from D-camphor in two steps.

从价廉易得的手性源 D-樟脑出发，合成了硫原子 b -位含有羟基的手性硅基烯丙基硫盐。

In poly the chain scission is based on the ozone oxidation of the alcoholic groups of PVAL with formation of ketone groups which in turn are the source of a ketoeenol tautomerism which leads to random chain scission by further ozone attack.

聚乙烯醇的乙醇基在臭氧的氧化作用下形成酮基，并依次成为酮烯醇互变异构现象的源头，在臭氧的进一步攻击下导致链无规则断裂，从而产生断链作用。

Methacryloyloxydecyl-2-thiouracil-5-carboxylate was synthesized from the reaction of thiouracil with diethyl ethoxymethylene malonate and ω-hydroxy-decyl-methacrylate.

以硫脲、乙氧基次甲基丙二酸二乙酯和甲基丙烯酸ω-羟癸酯为主要原料合成了一种新的粘接性单体10-甲基丙烯酰氧癸基－2-硫脲嘧啶－5-羧酸酯。

Receptor agonist ; SA4503{1?[2?（3; 4?dimethoxyphenyl）ethyl]?4?（3?phenylpropyl）piperazine}; DTG[3?di（2?tolyl）guanidine]; DHEAS ; PREGS ; learning ; memory

σ受体激动剂； 1-[2-（3； 4-二甲氧基苯基）乙基]-4-（3-苯丙基）哌嗪（SA4503）； 1； 3-二（2-甲苯基胍）；脱氢雄表酮硫酸酯；孕烯醇酮硫酸酯；学习记忆

Finally, the unreactive reason of 3,3-dinitro-1-butene in polymerization was analyzed.

分析了3，3-二硝基-1-丁烯自由基聚合反应失败的原因。

It starts with an aldol-type condensation in which a solution of the now commercially available E -[3-(4-fluorophenyl)-1-(1-methylethyl)-1 H-indol-2-yl]-2-propenal, 4 , 5 in THF is added to the preformed sodium-lithium salt of tert -butyl acetoacetate 5 at room temperature in THF.

它从一个醛型缩合其中一个解决现在的电子商业可-[3-(4-fluorophenyl)-1-(1-methylethyl)-1吲哚-2-基]-2-丙烯醛、4，5年增加了预四氢呋喃钠-锂盐叔丁基乙酰四氢呋喃在常温5。

4R,5S,6R-5,6-Bis-allyl-6-aldehyde-γ-hexanelactone I-145 was prepared from D-arabinose by six steps. Compound I-145 underwent Mukaiyama-type intramolecular aldolization to produce bicyclooctane I-147 stereospecifically.

我们以D-阿拉伯糖为起始原料，经六步反应，得到(4R，5S，6R)-5， 6-二烯丙氧基-6-醛基-γ-己酸内酯I-145，然后I-145发生分子内的Mukaiyama式aldol缩合反应，完全立体专一性地得到环化中间体I-147。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐