烯

The precooling operation of propylene jar at low temperature was studied in detail and the rational method of the precooling operation was advanced.

对低温丙烯罐的预冷工艺进行了较为仔细深入的研究，提出了较为科学、合理的预冷操作方法，确保了丙烯贮罐内罐基本维持每小时温降1℃。

Then the paper used the projection operator to structure the normal coordinate component,thus combined 15 normal vibration patterns of propadiene molecule.

先对丙二烯振动模式进行分类及构造投影算符，再用投影算符构造简正坐标分量，从而组合出丙二烯分子的15个简正振动模式。

The reaction with propargyl sulfide gave a mixture of allenic sulfide and furan.The former is the [2,3]-sigmatropic rearrangement product,while the latter is derived from the furt...

同样条件下与炔丙基硫醚的反应则生成[2，3]-σ重排产物联烯和呋喃衍生物，后者是联烯进一步在Ru作用下重排的产物。

The reactions of benzaldehydes bearing an ortho substituent group on the phenyl ring with propargyl bromide may yield a mixture of regioisomers (homopropargyl and homoallenyl alcohols) or a single homoallenic alcohol due to the steric effect.

邻位上的取代基由于位阻原因往往使反应得到含有高丙二烯醇和高炔丙醇的混合物或者单一的高丙二烯醇。

First, when operating the DABCO-catalyzed Ireland-Claisen rearrangement of propargylic acrylates 18b-d, we added dienophiles 40a-f in the reaction system to capture the rearranged allenes products respectively. The Diels-Alder adducts 41a-i were obtained with complete regioselectivity. Thus a novel tandem Ireland-Claisen rearrangement /Diels-Alder reaction process with propargylic acrylates has been developed.

首先在进行DABCO-催化的丙烯酸炔丙酯类化合物18b-d的Ireland-Claisen重排反应的同时，于反应体系中分别加入亲二烯体40a-f捕获重排得到的连二烯中间体，一步反应获得了单一区域选择性的Diels-Alder环加成产物41a-i，从而创建了一条新颖的丙烯酸炔丙酯类化合物的Ireland-Claisen重排与Diels-Alder环加成的串联反应路线。

Some aqueous catalysis systems have been applied in the industrial production of butyl aldehyde by propene hydroformylation.

其中水溶性催化剂体系已经用于丙烯氢甲酰化反应制备丁醛的工业化生产，然而，长链烯烃在含有催化剂的水相中溶解性较差，反应速率较慢。

The adsorption isotherms of benzene and propene at different temperatures and 1× 10－3～5.0 kPa show that at low pressure and high temperature, the loadings of propene are significantly lower than those of benzene.

在压力范围1×10－3～5.0 kPa，不同温度下苯与丙烯在分子筛内吸附等温线的模拟结果表明，在较高温度、较低压力下丙烯的吸附量要小于苯的吸附量。

On the basis of calculated results, the experiment was carried out to remove NO by propane and propene with pulse corona discharge and amonia.

根据计算结果，以丙烷和丙烯为例，利用脉冲电晕加氨分别与丙烷和丙烯协同进行了脱除NO的实验研究，得出了最佳工艺参数。

A new corrosion inhibitor and Universal antibacterial reagent, namely, the copolymer of N-isopro-pylacrylamide and N-allyl-1-benzoyl-3-phenyl-4,5-dihydro-4-formamido pyrazole was prepared.

合成了一种新的腐蚀抑制及广谱抑菌剂：N-异丙基丙烯酰胺与N-烯丙基-1-苯甲酰基-3-苯基-4，5-2H-4甲酰胺基吡唑的共聚物PNIPAM-Co-PBPCP。

Pyridazine was prepared by hydrogenolysis of 3,6-dichloro pyridazine obtained via chlorination of 3,6- pyridazine diol with phosphorus oxychloride.

以顺丁烯二酸酐与盐酸肼为原料经缩合成环反应生成顺丁烯二酰肼，再用三氯氧磷氯化合成3，6-二氯哒嗪，最后经催化加氢制得标题化合物哒嗪。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。