丙烷

It was found that the endo-type sulfonium salts were also worked but afforded the corresponding cyclopropanes with opposite absolute configuration compared with that from the exo-type salt.

考察了硫盐结构对反应的影响，当硫盐中碳-硫键位于樟脑骨架 endo 位置和碳-硫键位于 exo 位置时所得环丙烷化反应主产物的绝对构型相反。

The effect of reagents, reaction temperature, dinitrogen tetroxide and nitric acid on the yield and purity of 1,2-propanediol dinitrate were also investigated.

结果表明，N_2O_5和环氧丙烷硝化的主产物是1，2-丙二醇二硝酸酯，副产物是1，2-丙二醇单硝酸酯。

Nitratomethyl-3-ethyloxetane was synthesized by the process of cyclization, nitation from trimethlolpropane and diethyl carbonate, and the homopolymer of 3-nitratomethyl-3-ethyloxetane was synthesized with 1,4-butanediol as initator and boron trifluoride etherate as an catalyst by cationic ring-opening polymerization.

以三羟-甲基丙烷和碳酸二乙酯为原料经环化、硝化两步反应合成了化合物3-硝酸酯甲基－3-乙基氧丁环；采用1，4-丁二醇为引发剂，三氟化硼乙醚(BF3Et2O)为催化剂，NIMEO发生阳离子开环聚合得到一种端羟硝酸酯均聚醚PNIMEO。

Synthesis of cationic lignin flocculant by Lignin, epichlorohydrin and trimethylamine was obtained.

研究了木质素与环氧氯丙烷、三甲胺合成木质素季铵盐的工艺。

In this paper, varied factors which influenced the synthesis of epoxypropyl trimethyl ammonium chloride by the reaction of epichlorlhydrin with trimethylamine were studied.

研究了由环氧氮丙烷与三甲胺反应合成环氧丙基三甲基氮化铵沥青乳化剂中间体的各种影响因素。

The optimal technical conditions were resulted when lignin 5 g, epichiorohydrin 14 ml, trimethylamine solution 30mL, reaction temperature 60℃ and time 3.5 h.

得到较佳的反应条件为：木质素5g，环氧氯丙烷14 mL，三甲胺溶液（体积分数33%）30 mL，反应温度60℃，反应时间3.5h。

Chloro-2-hydroxypropyl trimethylammonium chloride was synthesized by using trimethylamine hydrochloride and epichlorohydrin as the raw materials and anhydrous as solvent.

以无水乙醇作溶剂、三甲胺盐酸盐和环氧氯丙烷为原料合成了3-氯-2-羟丙基三甲基氯化铵，探索出最佳合成条件为：n∶n为0.95∶1，反应温度为40~50℃，反应时间为30m in，所得产品质量分数大于98%，收率达90%。

Urushiol -based epoxy acrylate was prepared from urushiol, epichlorohydrin and acrylic acid.

以漆酚、环氧氯丙烷、丙烯酸为主要原料，通过两步反应合成了漆酚基环氧丙烯酸酯，其结构经IR表征。

Temperature, space velocity, ratio of propane to hydrogen, purge gas rate, membran...

推算出膜的渗透率及渗透选择性的变化对丙烷脱氢反应的影响，为无机膜的设计和制备提供了依据

Bisphenol-A exposure is certainly not the only factor in heart disease, but reducing at least one possible risk is a "no brainer," the University of Missouri's vom Saal said.

双酚A；2，2-双对羟苯基丙烷——不一定是引起心脏病的唯一因素，但是如果将其减少至少可以不费脑筋地减少一种风险的可能性，密苏里大学的vom Saal说道。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷