丙烷

Cyclopropane compounds areimportant reaction intermediates of organic systhesis and cyclopropane subunits arefound in many natural or unnatural products.

环丙烷衍生物是有机合成中常用的一类重要的反应中间体，手性的环丙烷衍生物在不对称合成中很有价值。

Jiangsu Agrochem Laboratory, Changzhou 213022, Jiangsu, China Abstract: Diacylhydrazine cyclopropane compounds were synthesized from cyclopropanecarboxylic acids which have comparable characters in the structures. Their structures were confirmed by IR spectrum and 1H NMR.

江苏省农用激素工程技术研究中心，江苏常州 213022 摘要：以结构上有可比性的环丙烷羧酸为原料，合成了环丙烷双酰肼化合物，结构经红外和核磁验证。

The increase in MAC for cyclopropane was unexpected, because published reports find only minimal actions at 122 GABAA receptors whereas isoflurane provides a large enhancement.

环丙烷对突变鼠最低肺泡有效浓度的增加出乎我们的意料，因为外界报导在α1β2γ2 γ-氨基丁酸 A 受体这一异氟烷作用最强的地方，环丙烷只有极微弱的作用。

Four triatomic heterocyclic compounds, cyclopropane , oxa cyclopropane , ethyleneimine and thiirane were fully optimized utilizing Gaussian94 program package with a density functional theory method B3LYP and an ab initio method MP2 at 6-311 ++G** level, and the theoretical results agrees well with the reference data, which shows that this method is reliable.

使用Gaussian94程序包和密度泛函方法B3LYP以及从头算方法MP2在B3LYP／6-311++G**基组水平上，对4种三元杂环化合物环丙烷、环氧乙烷、环乙亚胺和硫杂环丙烷进行了全优化，其理论数据和文献数据符合得很好，这表明该方法是可靠的。

Four triatomic heterocyclic compounds, cyclopropane, oxacyclopropane, ethyleneimine and thiirane were fully optimized utilizing Gaussian94 program package with a density functional theory method B3LYP and an ab initio method MP2 at 6-311++G** level, and the theoretical results agrees well with the reference data, which shows that this method is reliable.

程学礼 ，赵燕云使用Gaussian94程序包和密度泛函方法B3LYP以及从头算方法MP2在B3LYP/6-311++G**基组水平上，对4种三元杂环化合物环丙烷、环氧乙烷、环乙亚胺和硫杂环丙烷进行了全优化，其理论数据和文献数据符合得很好，这表明该方法是可靠的。

Zhongyuan vacuum residue and catalytic cracking decant oil propane deasphalting was carried out at the pilot continuous solvent deasphalting equipment.

以中原某炼油厂减压渣油和催化油浆为原料，结合溶剂脱沥青工艺的特点，以丙烷为溶剂对掺兑油浆后的减压渣油进行丙烷脱沥青研究。

hydantoin was synthesized from diethyl malonate comprising condensation with 1, 2-dichloroethane, ammonolysis to diamide, Hoffmann degradation to give 5-cyclopropanespirohydantoin, and ring-opening with 40% hydrobromic acid.

以丙二酸二乙酯为原料，先与1， 2-二氯乙烷缩合生成1， 1-环丙烷二羧酸二乙酯，再经氨解生成1， 1-环丙烷二甲酰胺，然后在次氯酸钙溶液中进行Hoffmann降解成环生成5-环丙螺海因，最后在40%氢溴酸中开环得到5-溴乙基海因。

The influences of the amount of 1,2-diaminoethane, temperature, molar ratio of epichlorohydrin and dimethylamine, and time on the viscosity and cationic degree of polyamine flocculants were investigated.

以环氧氯丙烷和二甲胺为原料，乙二胺为交联剂，制备有机阳离子聚合物，研究乙二胺加入量、反应温度、环氧氯丙烷和二甲胺的摩尔比、聚合时间等对聚合物粘度和阳离子度的影响。

Methods The propylbridged biferrocenyl substituted pyridazinone was synthesized by the reaction of propylbridged biferrocene with ethyl succinyl chloride, and then condensed with hydrazine hydrate.

双二茂铁丙烷先与丁二酸单乙酯酰氯发生酰化反应，生成的1，4酮酸酯再与水合肼缩合得到含有双二茂铁丙烷的哒嗪酮衍生物。

Recently several years,the company is engaged in development of Halon substitute,and since year 1997 has successively succeeded in development of 5 kinds substitute,HFC227ea heptafluorpropane,HFC23 fluoroform,HFC236fa hexafluoropropane ,HCFC/A,HCFC/C.

近年来，我公司致力于哈龙替代品的开发，97年以来先后开发成功七氟丙烷、三氟甲烷、六氟丙烷、HCFC/A、HCFC/C五种替代品，形成千吨级生产规模，并已大批量出口海外。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。