环烷

Methods Less toxic solvents such as cyclohexane, n-hexane, petroleum ether and chloroform were compared with benzene and toluene.

用毒性较小的溶剂环己烷、正己烷、石油醚和三氯甲烷等取代苯或甲苯。

In order to improve the radiation resistance of condensed-type RTV silicone rubber, two kinds of crosslinking agents are synthesized successfully: triethoxysilane with acenaphthenyl groups m.p.

当三乙氧基硅烷和三乙氧基硅烷用作缩合型RTV硅橡胶的交联剂时，由于二者所含的稠环基团的空间位阻较大，因而样品硫化速度较慢。

The influence of different substituent positions and different lengths of the alkoxy chain on the supramolecular systems of the water-unsolvable alkoxyphenylporphyrin with CD of different cavity diameters was also discussed.

在此基础上，探讨了不同取代位置、不同链长的烷氧基对非水溶性烷氧基苯基卟啉与不同空腔直径的环糊精的超分子体系的影响。

This paper studied the catalytic transformation performances of hydrocarbon model compounds (such as n-Hexane,cyclohexane,1-Hexene) and sulfur-containing model compounds (such as thiophene,3-methylthiophene and benzothiophene) on ZSM-5 catalysts.

以正己烷、环己烷、1-己烯3种烃类和噻吩、3-甲基噻吩和苯并噻吩三种硫化物为模型化合物，考察了烃及含硫模型化合物在ZSM-5分子筛催化剂上的催化转化性能。

Two pathways of cleavage and conversion in ring B of ergostane and cholestane are summarized.

第二部分总结了麦角甾烷及胆甾烷B环裂解和转化的两种途径。

Synthesis of Antidote of N-Dichloroacetyl-2-methyl-1-oxa-4-aza-spiro-4.4-nonane BI Hong-mei, ZHANG Jin-yan, LIANG Ying, SHEN Yong (College of Arts and Sciences Heilongjiang August First Reclamation University, Daqing 163319, Heilongjiang, China) Abstract: N-Dichloroacetyl-2-methyl-1-oxa-4-aza-spiro-4.4-nonane was synthesized by one pot method with isopropanolamine, cyclopentanone and dichloroacetyl chloride. The optimum reaction conditions obtained are as follows:the proportion in moles of the above materials is 1∶1∶1.2, reaction solvent is toluene, reaction temperature is -15 to -10 ℃,reaction time is 3 h, under the optimum condition, the yield of the compound is 50.0%.

除草剂解毒剂N-二氯乙酰基-2-甲基-1-氧杂-4-氮杂-螺[4.4]壬烷的合成毕洪梅，张金艳，梁英，沈勇(黑龙江八一农垦大学文理学院，黑龙江大庆 163319)摘要：以33%的氢氧化钠水溶液为缚酸剂，异丙醇胺、环戊酮和二氯乙酰氯为原料，采用&一锅法&合成了N-二氯乙酰基-2-甲基-1-氧杂-4-氮杂-螺[4.4]壬烷，采用正交实验法得到最佳反应条件：反应原料摩尔比为1∶1∶1.2，苯作溶剂，反应的温度为-15 ℃~-10 ℃，搅拌时间为3 h，产率达到50.0%。

As a part of a search for new antitumor agents from Chinese medicinal plants, the roots of Salvia prionitis, collected in Jiangxi Province, was investigated. From the roots of this plant, a new diterpene, saprirearine (95), a new anhydride-type compound, saprionide (96), a new 7, 8-seco-abietane diterpene derivative, 7, 8-seco-paraferruginone (99), and a new 4, 5- seco-5, 10-friedo-abietane diterpenoids, 3-keto-4-hydroxysaprorthoquinone (102), have been isolated along with 6 known compounds. Their structures were established by spectroscopic methods and chemical transformation.

在对红根草的乙酸乙酯提取物进行分离，纯化和结构研究中，共得到10个化合物，其中4个是新化合物，3个新化合物具有新颖的重排松香烷型二萜骨架，新化合物99为首次从本属植物中分得的7，8-开环的松香烷型二萜醌类化合物。

Therefore, the previous data of heats of formation of polynitrocubanes estimated from groupadditivity method are corrected.3. Calculations indicate that, for polynitrocubanes, there are parallel relationships between their experimental kinetic acidities pKa, the average s characters in the exocyclic carbon orbital used for the C-H bonds within each molecule, and the average C-H stretching frequencies within each molecule.

计算结果表明，多硝基立方烷的实验动力学酸性pK_a、分子内用于形成C-H键的环外碳轨道平均s成分和分子内的平均C-H伸缩频率之间，存在平行的递变关系，这对基于s_a或v_a的数值预估动力学酸性pK_a、进而指导多硝基立方烷和其它相关化合物的合成有助。

Therefore, the previous data of heats of formation of polynitrocubanes estimated from groupadditivity method are corrected.3. Calculations indicate that, for polynitrocubanes, there are parallel relationships between their experimental kinetic acidities pKa, the average s characters in the exocyclic carbon orbital used for the C-H bonds within each molecule, and the average C-H stretching frequencies within each molecule.

计算结果表明，多硝基立方烷的实验动力学酸性pK_a、分子内用于形成C-H键的环外碳轨道平均s成分和分子内的平均C-H伸缩频率(来源：AB0eC论文网www.abclunwen.com)之间，存在平行的递变关系，这对基于s_a或v_a的数值预估动力学酸性pK_a、进而指导多硝基立方烷和其它相关化合物的合成有助。

Based on B-trichloroborazine with boron-nitrogen ring structure, the monomer was synthesized by substitution reaction with different molar ratio of propylamine/isopropylamine, then the corresponding polyborazine was obtained through thermal polymerization.

以三氯环硼氮烷为原料，将其与正丙胺/异丙胺进行共取代反应，制得了不同结构的取代单体，再经热聚合反应获得了相应的聚硼氮烷先驱体。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失