丙烯基

Is a high-tech private enterprise, located in Laohekou City, Hubei Province, the main products are: 3,4 - dichloro-nitrobenzene; 3,4 - dichloroaniline; 2,4 - dimethyl-nitramine p; 2,4 - dimethylaniline; 2,6 - dimethyl-nitrobenzene; 2,6 - dimethylaniline; 3,5 - dimethyl-nitrobenzene; 3,5 - dimethyl Aniline; acrolein; Glutaraldehyde and other fine chemical products.

老河口联谊化工有限公司为一家高科技民营企业，位于湖北省老河口市，主要产品有：3，4-二氯硝基苯；3，4-二氯苯胺；2，4-二甲基硝基苯；2，4-二甲基苯胺；2，6-二甲基硝基苯；2，6-二甲基苯胺；3，5-二甲基硝基苯；3，5-二甲基苯胺；丙烯醛；戊二醛等精细化工产品。

What's more, we measure the inhibition rate of calcium carbonate and conglutination of the polymaths.

以丙烯酸、顺丁烯二酸酐和丙烯酰胺为原料，过硫酸钾为引发剂，在不同的条件下进行自由基聚合反应，生成不同分子量的共聚物，并测定了这些共聚物的粘度和对碳酸钙的阻垢率。

The molybdenum-based multiphasic oxide catalysts were prepared and tested in the selective oxidation of isobutylene to methacrolein reaction.

研究了添加不同助剂对钼基复合氧化物催化剂对异丁烯选择性氧化制备甲基丙烯醛反应的影响。

The effect of zeolites ion-exchanged by transition metals on thermal catalytic cracking reaction is studied. The product distributions of the cracking reactions catalyzed by theβor ZSM-5 zeolites exchanged with transition metals are different from that catalyzed by corresponding Hzeolites, which means the mechanism of cracking reactions has varied. Group Ⅷ metals Fe, Co, Ni and Cu, Zn are shown to be of strong catalytic activity of oxidative dehydrogenation, while Ti and Cr are not of oxidative activity. Catalyzed by zeolites or catalyst containing Ag, conversion of thermal catalytic cracking reactions and the yield of ethylene increase while the yield of propylene does not decrease. Silver can not only promote the formation of carbonium ion, but also convert carbonium ion into free-radical via redox reaction. The weak adsorption of olefins on silver reduces the occurrence of hydrogen transfer and dehydrogenation. As a result, the yield of light olefins is favored by silver in the catalyst.

采用过渡金属交换的分子筛作为催化剂，进行催化热裂解制取乙烯的反应，研究发现，在β沸石分子筛和ZSM-5分子筛中引入过渡金属后，催化热裂解反应的产物分布与相应的氢型分子筛相比有了较大的变化，说明过渡金属的加入对于催化热裂解反应的机理具有影响，Ⅷ族金属如Fe、Co、Ni和第Ⅰ、Ⅱ副族Cu、Zn表现出较强的氧化脱氢活性，产物中氢气、焦炭的产率很高，Ti、Cr则未表现出氧化作用：分子筛及催化剂中引入银后，催化热裂解反应的转化率和乙烯的产率有了提高，丙烯产率没有很大的变化，说明银在催化热裂解反应中能够促进正碳离子的生成，又有可能通过氧化-还原作用部分改变反应机理，促进了自由基的生成，并且由于银对烯烃的吸附很弱，其氢转移反应和脱氢、加氢活性比较低，有利于烯烃产率的提高。

To study the bioactive components from water soluble extract of the Chinese eaglewood, various column chromatography of Chinese eaglewood led to the isolation of ten compounds. Their structures were elucidated as 2,3-bis(3-hydroxyphenyl)- propan-1-ol (1), [(2R,3R)-3-(4-amino-3,5-dimethoxyphenyl)oxiran-2-yl]methanol (2), 8-chloro-4'- methoxy-5,6,7,3'-tetrahydroxy-2-(2-phenethyl)-5,6,7,8-tetrahydrochromone (3), 4'-methoxy-5,6,7,3'-tetrahydroxy-2--5,6,7,8-tetrahydrochromone (4), the isomer of 4 (5), 4'-methoxy-5,6,7,8-tetrahydroxy-2-(3'-hydroxyphenethyl)-5,6,7,8- tetrahydrochromenone (6), 4'-methoxyisoagarotetrol (7), 6-hydroxy-2-(2-hydroxy-2- phenethyl)-chromone (8), 6-hydroxy-2-(2-phenethyl)-chromone (9), 6-hydroxy-2-(4'- hydroxy-2-phenethyl)-chromone (10), and Guaiacylacetone (11) by means of spectral analysis and comparison with references.

为了进一步发现沉香中具有生理活性的化学成分，本文对国产沉香的水溶性成分进行了研究，从中分离得到11个化合物，通过红外、紫外、质谱、核磁共振(1H-NMR， 13C-NMR， COSY， HSQC， HMBC， ROESY)波谱解析，分别鉴定为：2，3-二(3-羟基苯基)-丙-1-醇(1)，[(2R，3R)-3-(4-氨基-3，5-二甲氧苯基)-2-氧化烯基]甲醇(2)，8-氯-4'-甲氧基-5，6，7，3'-四羟基-2-(2-苯乙基)-5，6，7，8-四氢色原酮(3)，4'-甲氧基-5，6，7，3'-四羟基-2-(2-苯乙基)-5，6，7，8-四氢色原酮(4)，化合物3的差向异构体(5)，4'-甲氧基-5，6，7，8-四羟基-2-(3'-羟基-2-苯乙基)-5，6，7，8-四氢色原酮(6)，4'-甲氧基异沉香四醇(7)，6-羟基-2-(2-羟基-2-苯乙基)色原酮(8)，6-羟基-2-(2-苯乙基)色原酮(9)，6-羟基-2-(4'-羟基-2-苯乙基)色原酮(10)和Guaiacylacetone (11)。

A facile method is presented for synthesis of malonaldehyde dianil from propargyl alcohol by oxidizing using chromium trioxide and addition reaction with aniline.

以丙炔醇为原料，经三氧化铬氧化生成丙炔醛后，直接与苯胺反应简便地合成了β-苯胺基丙烯醛缩苯胺。

The preparation of avermyctin emulsions in water was achieved by mixing the surfactants polyoxyethylene (10) octylphenyl ether (OP10), polyoxyethylene styrenated phenol ether (602), and polyoxyethylene (40) castor oil ether (EL-40) with polyoxyethylene (20) castor oil ether (EL-20), separatively. Emulsion stability was investigated by analyzing the hydrophile-lipophile balance, critical micelle concentration, and surface tension. Then, the surfactants of polyoxyethylene polyoxypropylene styrenated phenol ether (1601), block copolymer (L64), and octyl phenyl polyoxyethylene phosphonate were added to the emulsion made by blending EL-40 and EL-20, separatively. The stability of the emulsions was investigated further and discussed in terms of droplet size, surface tension, and zeta potential.

首先将辛基酚聚氧乙烯醚(OP10)、苯乙烯基酚聚氧乙烯醚(602)和蓖麻油聚氧乙烯(40)醚(EL-40)分别与蓖麻油聚氧乙烯(20)醚(EL-20)复配制备阿维菌素水乳剂，从亲水亲油平衡值、临界胶束浓度、表面张力等方面分析了二元表面活性剂复配对乳液稳定性的影响；其次，在EL-40与EL-20复配基础上，将苯乙烯基酚聚氧乙烯聚氧丙烯醚(1601)，嵌段共聚物(L64)和辛基酚聚氧乙烯醚磷酸酯分别添加到乳液中，从粒径、表面张力和zeta电势等方面考察三元表面活性剂复配对乳液稳定性的影响。

We studied the infection ofthe different reactant ratios to the degree of nitration when the polystyrere was nitrified. Thena series PS-NH_2 With different concentrations of amidocyanogen were gained by reducingPS-NO_2. At last the high active acryloylthiourea were grafted on the amidocyamogens.

在聚苯乙烯的硝化过程中，研究了不同的反应物配比对硝化度的影响，并对不同硝化度的硝基聚苯乙烯进行还原反应，得到了胺基含量不同的系列胺基聚苯乙烯，最后利用聚苯乙烯上的胺基和高活性的丙烯酰基异硫氰酸酯进行加成，合成AGPS。

The grafting copolymerization of 2-Acrylamido-2-methyl propane sulfonic acid onto soybean protein isolate was carried out in 8 mol/L urea aqueous solution with ammonium persulphate as initiator and β-mercaptoethanol as protein unfolding agent.

以亲水2-丙烯酰胺基-2-甲基丙磺酸为接枝单体、过硫酸铵为引发剂、β-巯基乙醇为大豆分离蛋白的变性剂，在8mol/L的尿素溶液中对SPI进行接枝共聚改性。

E. . The epoxidation of cis-allylic alcohols is difficult, and with 20％mol Ti 〓 and 30％mol tartrates, up to 80％e.

的对映选择性被得到；对难于环氧化的顺式烯丙基醇，使用20％mol四异丙氧基钛和30％mol酒石酸酯得到最高80％e.e。

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。