烯基

Type shown above, the lower temperature as allyl methyl carbocations (1) is greater than the stability of carbocations (2), so the potential energy diagram in the reaction pathway for the carbon embodied in the positive ion hybrid resonance body and Chloride Cl-if by 1,4 - addition will have to experience higher ...

如上式所示，较低温度下由于烯丙基甲基碳正离子(1)的稳定性大于碳正离子(2)，所以在反应历程势能图中体现为碳正离子共振杂化体与氯离子Cl-若按1，4-加成则要经历较高。。。

The results of this reseach showed that administration of SF intracolonically had protective effect on the colon injury in the rat model of colitis induced by acetic acid enema, which was probably due to the mechanism of antioxidation, inhibition ofarachidonic acid metabolis and platelets activation, administration of SF intracolonically also showed protective effect on the colon injury in the rat model of colitis induced by trinitrobenzene sulfonic acid and ethanol, which was probably due to antioxidation and inhibition of macrophages activation.

实验研究表明，大鼠分别经乙酸、TNBS和乙醇处理后均出现典型的结肠炎症状，给药后分别评价结肠粘膜损伤指标、结肠组织病理变化，检测结肠组织炎症指标、结肠组织氧化损伤指标及主要炎性细胞因子改变；实验结果：阿魏酸钠对大鼠乙酸性结肠炎结肠粘膜损伤具有缓解保护作用，其机制可能与直接抑制炎症结肠粘膜花生四烯酸代谢过度，抑制血小板活化，清除大量氧自由基有关；阿魏酸钠对大鼠TNBS性结肠炎粘膜免疫损伤亦具有缓解保护作用，其机制可能与抗氧化，抑制结肠巨噬细胞活化有关。

The relationship between the melt index, the tensile strength and the stress-crack resistance, and that between the end-group structure and thermal stability of copo-lymer of tetrafluoroethylene and hexafluoropropylene have been studied.

研究了四氟乙烯和六氟丙烯共聚物的熔融指数，抗张强度和耐应力开裂之间，以及端基和热稳定性之间的关系。

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。

The ultrathin multilayer film of poly (diallyldimethylammonium chloride) and polyvinylidene fluoride has been prepared by the layer-by-layer static self-assembly method. The PVDF/PDDA multilayer film with the thickness ranging from about 30nm to 150 nm the thickness of each layer is about 9nm.

聚二烯丙基二甲基氯化铵和极化处理后的聚偏氟乙烯复合超薄膜是通过层与层的静电自组装方法制备的，厚度约30～150 nm，每层膜厚度约为9 nm。

Malonyloxyborohydride,a hydroboration reagent,is prepared by reaction of malonic acid and sodium borohydride,and is used to react with dihydromyrcene in THF.

用一种硼氢化试剂———丙二酸与硼氢化钠反应生成的丙二酰氧基硼氢化钠在THF中与二氢月桂烯反应制备香茅醇。

In this report, we wish to report our results on "sodium p-toluenesulfinate in free radical reactions".

本研究报告是这一年来本实验室在有关对甲苯亚磺酸钠与烯类化合物的自由基反应的研究结果。

The basic principle of the toughening and modifying on bismaleimide resin was introduced, the characteristics and the modifying effects of the toughening and modifying with thermoplastic resin, the combination of aromatic diamine and epoxy resin, organic silicone, allyl compounds, cyanate ester resin, the blends of three-dimensional braided carbon and Kevlar fabrics and so on were discussed.

介绍双马来酰亚胺树脂增韧改性的基本原理，论述了热塑性树脂增韧改性、芳香族二胺和环氧树脂相结合增韧改性、有机硅增韧改性、烯丙基系列化合物增韧改性、氰酸酯树脂增韧改性、三维编织碳纤维和凯夫拉纤维混合增韧改性等方法的特点与改性效果。

Single component and multi\|component of iron system colloidal catalyst \Ali\|Bu\-3CH\-2CHCH\-2Cl\ were mixed by different ratios in hydrogenated gasoline medium at 25℃.This paper studied the relationship between the nonaqueous systematic electroconductivity and the concentration of catalyst components.In combination with Tyndall effect,polymerization experimental results,Ali\|Bu\-3 existed in associated state and dissociated into ionpair.The reaction between Ali\|Bu\-3 and Fenaph\-2 was the main reaction which formed colloidal core.Ali\|Bu\-3 reacted on CH\-2CHCH\-2Cl and Ali\|Bu\-2Cl was yielded which joined the formation of active center on the surface of colloidal core.The excessive Ali\|Bu\-3 was dissociated into ionpair which formed double electrode layer,and the double electrode layer kept the colloidal particles relatively stable.

研究了在25℃加氢汽油介质中，铁系胶体催化剂［Fenaph2Ali-Bu3―CH2==CHCH2Cl］单组分、多组分按不同配比混合，非水体系电导率与浓度的关系，结合Tyndall效应，聚合实验结果，得出Ali-Bu3以缔合状态存在并解离成离子对它同环烷酸亚铁的作用是形成胶核的主要反应，与氯丙烯反应生成的氯化异丁基铝，在胶核表面参与形成活性中心由过量Ali-Bu3解离的离子对形成的双电层结构，使胶粒保持相对稳定。

In the synthetic reaction process dicyclopentadiene is a terminal group sealing agent,and there is no Diels-Alder addition reaction taking place.

在合成反应过程中二聚环戊二烯是端基封闭剂，无Diels-Alder加成反应发生。

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。