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   乙烯— 的翻译结果: 查询用时:0.481秒
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乙烯
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  “乙烯—”译为未确定词的双语例句
     The one-pot oligo-cyclization of ethylene catalyzed by CpaZrCl2 with EAO (ethylaluminoxane) or Et3Al as cocatalyst is a newly founded reaction, and it has the latent application foreground.
     Cp_2ZrCl_2与EAO或Et_3Al组成的催化体系催化乙烯—釜(one-pot)齐聚—环化反应是一种新型连续反应,具有潜在的应用前景。
短句来源
     Study on the π-Complexation Adsorbents for Ethylene-Ethane Separation
     乙烯—乙烷分离用π络合吸附剂的研究
短句来源
     The thermal and mechanical properties of blends of Nylon 6(N6)/lowdensity polyethylene(LDPE) and influences of ethylene/vinyl acetate(EVA) as a third component on the properties of blends of N6/LDPE have been studied.
     本文研究了尼龙6(N_6)/低密度聚乙烯(LDPE)共混物的热和力学性能以乙烯—醋酸酯共聚物作为第三组分对N6/LDPE共混物性能的影响。
短句来源
     SUBSTITUENT CHEMICAL SHIFT (SCS) AND THE SEQUENCE STRUCTURE OF ETHYLENE - α - OLEFINE COPOLYMERS Ⅲ. Quantitative Analysis
     取代基效应(SCS)与乙烯—α—烯烃共聚物的序列结构——Ⅲ.定量分析
短句来源
     The ethylene-styrene copolymers were characterized by 13C-NMR, DSC and GPC.
     乙烯—苯乙烯共聚物的~(13)C-NMR研究表明:共聚物中含有苯乙烯单体的嵌段结构;
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  相似匹配句对
     Ethylene Product Design
     乙烯产品的设计
短句来源
     The Synthesis of Vinylpyridines
     乙烯吡啶的合成
短句来源
     ETHYLENE-VINYL ALCOHOL COPOLYMER FIBER
     乙烯乙烯醇共聚纤维
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A CaCO3 filler was treated by generally used coupling agents and a special one - ethylene-octene copolymer (POE)-g-maleic anhydride (MAH).
      
Ethylene-Induced Activation of Xylanase in Adventitious Roots of Maize as a Response to the Stress Effect of Root Submersion
      
Using the receptor-directed antagonist of ethylene action 2,5-norbornadiene and the ethylene-insensitive mutants of A.
      
Polymer-bitumen binders for the highway engineering were obtained by the addition of a ternary ethylene-propylene rubber to a bitumen.
      
Ethylene-Induced Production of Cadaverine Is Mediated by Protein Phosphorylation and Dephosphorylation
      
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The Mannich bases derived from phenylacetone (Ⅰ,R=Me)and dibenzyl ke- tone (Ⅰ,R=CH_2Ph) prepared in our previous work gave expected semicarba- zones(Ⅱ) in neutral or slightly acidic media.Degradation of their methiodides gave vinyl ketone semicarbazones (Ⅲ).The structure of the latter was shown by their characteristic ultra-violet light absorption properties,and they gave in- tense absorption bands near 260 mμ.The pyrazolinecarboxamides (Ⅳ),if formed,would behave more like saturated semicarbazones such as Me·CO·CHMePh...

The Mannich bases derived from phenylacetone (Ⅰ,R=Me)and dibenzyl ke- tone (Ⅰ,R=CH_2Ph) prepared in our previous work gave expected semicarba- zones(Ⅱ) in neutral or slightly acidic media.Degradation of their methiodides gave vinyl ketone semicarbazones (Ⅲ).The structure of the latter was shown by their characteristic ultra-violet light absorption properties,and they gave in- tense absorption bands near 260 mμ.The pyrazolinecarboxamides (Ⅳ),if formed,would behave more like saturated semicarbazones such as Me·CO·CHMePh and CH_2Ph·CO·CHEtPh,which gave maxima located at about 230mμ.The vinyl ketone semicarbazones could not be converted to the cyclic compounds (Ⅳ) by treatment with concentrated sulphuric acid.It was recalled that Δ~2-isoxazolines,beside vinyl ketone oximes,were obtained by us previously from the degradation of Mannich base oxime methiodides. Both the dimethylamino(I:R=CH_2Ph,R'=Me) and the diethylamino(I: R=CH_2Ph,R'=Et) compounds gave the identical product (Ⅷ) on treatment with semicarbazide hydrochloride in the presence of excess sodium acetate.It was recalled that an abnormal compound,m.p.101-102,was formed by these two Mannich bases on treatment with hydroxylamine hydrochloride and sodium acetate.This product might be (Ⅶ),formed by elimination of a mole of hy- droxylamine from (Ⅸ),which is analogous to (Ⅷ). Treatment of the Mannich base (I,R=CH_2Ph,R'=Me) itself with sodium acetate gave dibenzyl ketone.This is the reverse change of the original Mannich reaction.However,its methiodide,on degradation with sodium hydroxide, gave a vinyl ketone which readily dimerised into a dihydropyran (Xa or Xb). Several expected pyrazolines were obtained from the Mannich bases and phenylhydrazine.Their ultra-violet light absorption characteristics were listed.

几个 Mannich 碱在中性或微酸性的情况下制成它们的缩氨基脲,其中一个Mannich 碱在碱性情况下形成一个含有两分子氨基脲的物质。那些 Mannich 碱缩氨基脲的季铵碱当在碱性情况下递降时生成乙稀酮的缩氨基脲,而不生成环状的化合物(Ⅳ)。从二苯甲基酮衍生的一个 Mannich 碱经醋酸钠作用后变为原来的1,3-二苯基丙酮,但这个 Mannich 碱的季铵盐经碱作用后成为乙稀酮,而这个乙烯酮迅速贰聚。几个4,5-二氢隣二氮杂茂自 Mannich 碱如预期地形成。上列许多产物的紫外线光谱曾经测定。

~~

张存浩在上面报告中(本期学报第27页)已报导了在合成烃类和含氧化合物时物料平衡的计算方法。我们进一步提出了计算烃收中水收率(H_2O~I)校正方法和实际烃收率(GCH_2实)的校正方法如下: H20~I=H_2O-(14/(12)C_水-2/(18)CO_水-4/(45)COOH_水)+(18/(17)OH_洗+18/(28)CO_洗++36/(45)COOH_洗)+(18/(17)OH_油+28/(28)CO_油+36/(45)COOH_油), GCH_2实=W1+(1-K)W2+W3+14/(12)C_水-(18/(17)OH_油+16/(28)CO_油++32/(45)COOH_油+H_2~1)。利用上述方法可以计算出能代表催化剂活性及选择性的指标,GCH_2计——即由计算求得的C_3~+产品中CH_2根总含量(克CH_2/标准米~3原料气)。为了满足上述物料计算,而提出了产品分析系统,其中包括下列各项数据:水相有机全碳含量,各种官能团含量,原料气和废气分析结果,C_5~+混合物平均分子量,溴价,产品收率。各项分析是采用—般方法的;而气体分析采用了化学分析和体积色谱法的综合性方法,因而可测定甲烷、乙烷、...

张存浩在上面报告中(本期学报第27页)已报导了在合成烃类和含氧化合物时物料平衡的计算方法。我们进一步提出了计算烃收中水收率(H_2O~I)校正方法和实际烃收率(GCH_2实)的校正方法如下: H20~I=H_2O-(14/(12)C_水-2/(18)CO_水-4/(45)COOH_水)+(18/(17)OH_洗+18/(28)CO_洗++36/(45)COOH_洗)+(18/(17)OH_油+28/(28)CO_油+36/(45)COOH_油), GCH_2实=W1+(1-K)W2+W3+14/(12)C_水-(18/(17)OH_油+16/(28)CO_油++32/(45)COOH_油+H_2~1)。利用上述方法可以计算出能代表催化剂活性及选择性的指标,GCH_2计——即由计算求得的C_3~+产品中CH_2根总含量(克CH_2/标准米~3原料气)。为了满足上述物料计算,而提出了产品分析系统,其中包括下列各项数据:水相有机全碳含量,各种官能团含量,原料气和废气分析结果,C_5~+混合物平均分子量,溴价,产品收率。各项分析是采用—般方法的;而气体分析采用了化学分析和体积色谱法的综合性方法,因而可测定甲烷、乙烷、乙烯等收率和计算出C_3~+的收率。根据具体情况可简化上述物料平衡计算和校正方法。探用这种方法可使GCH_2计和GCH_2实相差—般在10克/标准米~3原料气以内。

Recently, Funke and Kornmann synthesized chloramphenicol from 4-aryl-5-halo-dioxane-1,3 which was obtained by the addition of hypobromous acid to cinnamyl alcohol and followed by cyclization with benzaldehyde. Similar compound of this type should be prepared by the addition of formaldehyde and β-halostyrene, the general formula of which may be represented as follows:■ The above reaction was studied by Beets but he failed to isolate the desired product and the starting material was almost quantitatively recovered....

Recently, Funke and Kornmann synthesized chloramphenicol from 4-aryl-5-halo-dioxane-1,3 which was obtained by the addition of hypobromous acid to cinnamyl alcohol and followed by cyclization with benzaldehyde. Similar compound of this type should be prepared by the addition of formaldehyde and β-halostyrene, the general formula of which may be represented as follows:■ The above reaction was studied by Beets but he failed to isolate the desired product and the starting material was almost quantitatively recovered. After a careful study of his method, we found that his failure is probably due to the use of an insufficient amount of acid.Further, he carried out the reaction in heterogenous phases. Either by raising the acid concentration (50% of Sulfuric acid in contrast to 5% as used by Beet's) or by carrying out the reaction in acetic acid, a fairly good yield (60%-90%) of 4-aryl-5-halo-dioxane-1,3 was obtained. It is very interesting that we could isolated two products having the same elementary cmposition, either by running the reaction in aqueons medium or in acetic acid. Probably we are dealing with two diasteroisomers as the addition of formaldehyde to bromo or chlorostyrene may proceed either according to the cis or trans mood. The dioxanes obtained above were nitrated and the para nitrophenyl-dioxanes were isolated.The latter compounds all yield para-nitrobenzoic acid on oxidation: ■ The present authors succeded for the first time in isolating two diasteroisomers from the Prins reaction.The nature of these two isomers as well as their utilization for the synthesis of chloramphenicol and related compounds are now under investigation in this laboratory.

Beets在进行β-溴苯乙烯舆甲醛的反应时遭受到了失败,我们考虑其失败的原因在于进行反应时,应用了浓度过低的酸,而且是在多相下进行,因而影响到反应速度.在增加反应的酸度时,或将反应在均相下进行,皆以极好的产率得到了β-溴苯乙烯或氯苯乙烯奥甲醛的反应产物4-芳-5-卤-1,3-二氧六环,后者对于提供氯霉素的新合成法是一个有趣的化合物. 我们在Prins反应的产物中,第一次得到二个异构体,二者沸点不同,可以顺利的分开.我们认为这可能是两种非对映体,关于这两个异构体的性质还在研究中. 得到的高沸点或低沸点4-苯-5-卤-1,3-二氧六环,易硝化而形成相应的对位一元硝化产物,它们经过侧链氧化,都形成对位硝基苯甲酸. 作者正利用自己所合成的二种4-芳-5-卤-1,3-二氧六环的异构体,企图经四步手续变为氯霉素.

 
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