助手标题  
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
   tetramethyl- 的翻译结果: 查询用时:0.009秒
图标索引 在分类学科中查询
所有学科
更多类别查询

图标索引 历史查询
 

tetramethyl-
相关语句
  相似匹配句对
     SYNTHESIS OF OCTAHYDRO-TETRAMETHYL-ACETONAPHTHONES
     龙涎酮的合成
短句来源
     CATALYTIC CYCLOPROPANATION OF TETRAMETHYL ETHYLENE
     四甲基乙烯环丙烷化反应的催化研究
短句来源
     PREPARATION OF TETRAMETHYL AMMONIUM HYDROXIDE(I)
     四甲基氢氧化铵(TMAH)的制备(Ⅰ)
短句来源
     STUDY ON DIVINYL TETRAMETHYL DISILOXANE-BISBENZOZYCLOBUTENE PREPOLYMER
     二乙烯基硅氧烷-双苯并环丁烯预聚体的研究
短句来源
查询“tetramethyl-”译词为用户自定义的双语例句

    我想查看译文中含有:的双语例句
例句
为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。
  tetramethyl-
Controlled/living photopolymerization of methyl methacrylate (MMA) in miniemulsion mediated by 4-hydroxy-2,2,6,6-tetramethyl-piperidinyloxy (HTEMPO) was carried out at ambient temperatures.
      
The N,N,N",N"-tetramethyl-p-phenylenediamine → MV (chiefly dependent on PSI) electron transfer was inhibited by SA and AT but was resistant to MV.
      
In this work we have studied the influence of different electron donors (N,N,N',N'-tetramethyl-p-phenylenediamine, L-epinephrine, 2,2'-azinobis(3-ethylbenzthiazoline-6-sulfonic acid), potassium ferrocyanide) on the PGHS activities.
      
Destruction of nuclei was strengthened by illumination, prevented by the antioxidant α-tocopherol and an electron acceptor N,N,N',N'-tetramethyl-p-phenylenediamine, and removed by quiacrine.
      
Complexation ability of the [H8 - nL]n- anions with respect to tetramethyl- and tetraethylammonium, N-methylpyridinium, and [Co(En)2(C2O4)?]+ cations was studied by pH-potentiometry.
      
更多          


With a view to synthesize a simple functional derivative of pentalene (Ⅰ) so as to testify Hückel's theory of aromaticity, the compound bicycle (3.3.0) octa-3, 7-dien-2, 6-dione (Ⅲ), (the enol form of which is 1, 4-dihydroxypentalene(Ⅱ)), was obtained.The key intermediate, bicyclo (3.3.0) octan-2, 6-dione (Ⅳ), was prepared through a new route with an overall yield of 19—36%: Hydrogen chloride was added to cyclopentadiene to form 3-chlorocyclopentene(b.p. 27—28°/11—12,n_p~(250) 1.4748; 85—92%), which was coupled...

With a view to synthesize a simple functional derivative of pentalene (Ⅰ) so as to testify Hückel's theory of aromaticity, the compound bicycle (3.3.0) octa-3, 7-dien-2, 6-dione (Ⅲ), (the enol form of which is 1, 4-dihydroxypentalene(Ⅱ)), was obtained.The key intermediate, bicyclo (3.3.0) octan-2, 6-dione (Ⅳ), was prepared through a new route with an overall yield of 19—36%: Hydrogen chloride was added to cyclopentadiene to form 3-chlorocyclopentene(b.p. 27—28°/11—12,n_p~(250) 1.4748; 85—92%), which was coupled by magnesium to 1,1'-bi-2-cyclopentenyl (V, b.p. 70°/18, n_p~(230) 1.4880; 80—92%). This diene (Ⅴ) was ozonized and the ozonide was decomposed with 40% peracetic acid to yield hexane-1, 3, 4,6-tetracar-boxylic acid (Ⅵ). The tetramethyl derivative (Ⅶ) of the acid (low melting crystals of a cis-trans mixture, b.p. 144—1.47°/0.07 mm; 66—75% overall yield from (Ⅴ)) was dicyclized by potassium t-butoxide to 3, 7-dicarbomethoxy-bicylo (8.8.0) octan-2,6-dione (Ⅷ, m.p. 90.4—92.4°, cis-trans mixture; 52—67% yield). Upon decarbomethoxylation, the latter (Ⅷ) yielded the dione (Ⅳ) (m. p. 45—45.5°; 79—84% yield) which was found to be identical with Ruzicka's product. Lithium aluminmn hydride reduction of the dione (Ⅳ) gave the corresponding diol (Ⅸ) (b. p. 106—106.5°/0.005, 65%), but the diol failed to form pure dienes in fair yield by Chugaev dehydration.The dione (Ⅳ) was chlorinated in acetic acid to dichlorobicyclooctandione (X, 64—74%), which was transformed into its corresponding diethyleneketal (Ⅺ) (separated into 3 forms: α-, m. p. >210° d.; β-, m. p. 126—127°; γ-, m. p. 100—101°; β- and γ- forms shown to be the 3, 7-dichloro derivatives. 52—65% yield). Potassium t-but-oxide dehydrochlorinated the dichloroketal (Ⅺ) to bicylo (8.8.0) octa-3, 7-dien-2, 6- dione diethyleneketal (Ⅻ, m. p. 99—100.5°; 69% yield), upon ketal-exchange of (Ⅻ) with excess acetone, the synthesis of the diendione (Ⅲ) (m. p. 75.5—76.5°, 76% yield) was accomplished. The structure of all the above mentioned compounds was established by analyses, chemical transformations and spectral data.The diendione (Ⅲ) does not contain any detectable amoumt of its enol form, 1, 4-dihydroxypentalene (Ⅱ), neithor can it be forced to form stable enolized forms. Thus it is believed that the pentalene system does not pessess aromatic character.

本文报告烯酮(Ⅲ)的合成,与(Ⅲ)相当的烯醇体即1,2-二羟二环辛四烯(Ⅱ)。合成的关键中間物,二酮(Ⅳ),由一新合成步驟制备,总产率19—36%:低温加氯化氫于环戊二烯得3-氯环戊烯(85—92%),再用鎂使之双合而成二烯(Ⅴ)(80—92%)。(Ⅴ)的臭氧化合物經过氧乙酸分解而形成四元酸(Ⅵ),酯化后得其四甲酯(Ⅶ)(由(Ⅴ)至(Ⅶ)总产率66—75%);后者可环化为二甲氧羰基二酮(Ⅷ)(52—67%),(Ⅷ)經水解脫羧即生成二酮(Ⅳ)(79—84%)。二酮(Ⅳ)可还元为二醇(Ⅸ)(65%)。由二酮(Ⅳ)再經四步反应后即得烯酮(Ⅲ):氯化二酮(Ⅳ)得二氯二酮(Ⅹ)(64—74%);將(Ⅹ)与乙二醇一同脫水縮合得縮二酮(Ⅺ)(52—66%);自(Ⅺ)脫氯化氫后得二烯縮二酮(Ⅻ)(69%),后者与丙酮經交換反应即变为烯酮(Ⅲ)(76%)。上述各化合物的分子結構,均經証明。烯酮(Ⅲ)不含其相当的烯醇体(Ⅱ);在鹼性溶液中亦不能形成稳定的二环幸四烯二醇-陰离子。因此可以相信,二环辛四烯体系具有芳族性的可能性極微。

Mating tests among haploid lines of U.maydis verified that sex is controlled by multiplefactors.Difference in rate of respiration between different mating groups was observed.Inliquid culture supplied with tryptophan,strains of U.maydis were capable of producing largeamount of growth promoting substance which was identified as IAA by Salkowski reaction,paper chromatography and split-hypocotyle curvature test with soy bean sprouts.High con-tents of IAA were also found in smut galls incited by paired lines of...

Mating tests among haploid lines of U.maydis verified that sex is controlled by multiplefactors.Difference in rate of respiration between different mating groups was observed.Inliquid culture supplied with tryptophan,strains of U.maydis were capable of producing largeamount of growth promoting substance which was identified as IAA by Salkowski reaction,paper chromatography and split-hypocotyle curvature test with soy bean sprouts.High con-tents of IAA were also found in smut galls incited by paired lines of opposite sexes as wellas in the gnarled tissues caused by haploid lines.Consequently,IAA is held to be at leastpartially responsible for the abnormal growth of the infected tissues although it might not bethe only gall inciting substance.Feeding experiments with labeled glucose revealed that healthytissues exhibited a strong EMP tendency (C_1/C_(1-6)=0.46) while both gall tissues and gnarledtissues showed conspicous HMP tendencies (C_1/C_(1-6)=1.23 and 1.27 respectively) with C_1 values70% higher than that of the healthy.Respiration of diseased tissues was invariably high ascompared with healthy ones during early stages of disease development.Correlations betweenIAA production,increase of respiration and HMP tendency were quite strong.Tetramethyl-thiuram disulfide (TMTD) was proved highly inhibitive to the growth of U.maydis and its pro-nounced chemotherapeutic effect on the infected corn seedlings was also observed.

单倍菌系配合试验(Mating test)证实玉米黑粉菌的性质受多因子控制。不同配合型间呼吸强度有明显的差异。玉米黑粉菌在含有色氨酸的培养基中能产生大量刺激生长物质(最高达380微克/毫升),经 Salkowski 反应、纸层析及黄豆芽劈茎试验证明,这一生长物质为 IAA。单性菌系引致的茎叶扭曲组织及配合接种后产生的瘤组织中 IAA的量显然高于健组织(分别为11.18、17.65及6.47微克/克),证明这些病症的形成与 IAA 有关。病健组织分别饲以放射性比强相等的第1位碳(G_1)标记的及第1—6位碳(C_(1—6))平均标记的葡萄糖后,测定糖酵解过程中释放 CO_2的 G_1/C_(1—6)值的结果示明,健组织葡萄糖酵解 EMP 趋势较强(G_1/C_(1—6)值为0.46),瘤组织及单性菌性引致的扭曲组织则有明显的 HMP 趋势(G_1/G_(1—6)值分别为1.23及1.27,G_1值均较健组织高70%)。发病前期的病组织的呼吸强度亦较健组织有显著提高。病组织 IAA 的含量与呼吸强度及 HMP 趋势的比强间似亦有一定的相关性。福美双(TMTD)对玉米黑粉菌的生长具有强烈的抑制作用,并对玉米黑粉病表...

单倍菌系配合试验(Mating test)证实玉米黑粉菌的性质受多因子控制。不同配合型间呼吸强度有明显的差异。玉米黑粉菌在含有色氨酸的培养基中能产生大量刺激生长物质(最高达380微克/毫升),经 Salkowski 反应、纸层析及黄豆芽劈茎试验证明,这一生长物质为 IAA。单性菌系引致的茎叶扭曲组织及配合接种后产生的瘤组织中 IAA的量显然高于健组织(分别为11.18、17.65及6.47微克/克),证明这些病症的形成与 IAA 有关。病健组织分别饲以放射性比强相等的第1位碳(G_1)标记的及第1—6位碳(C_(1—6))平均标记的葡萄糖后,测定糖酵解过程中释放 CO_2的 G_1/C_(1—6)值的结果示明,健组织葡萄糖酵解 EMP 趋势较强(G_1/C_(1—6)值为0.46),瘤组织及单性菌性引致的扭曲组织则有明显的 HMP 趋势(G_1/G_(1—6)值分别为1.23及1.27,G_1值均较健组织高70%)。发病前期的病组织的呼吸强度亦较健组织有显著提高。病组织 IAA 的含量与呼吸强度及 HMP 趋势的比强间似亦有一定的相关性。福美双(TMTD)对玉米黑粉菌的生长具有强烈的抑制作用,并对玉米黑粉病表现极为明显的治疗效果。

In the presence of a three-component catalyst(tri-n-butylamine,tetramethyl-ethylene-

在三组分催化剂——三正丁胺、四甲基乙二胺、氯化亚铜作用下,进行不同硅烷(三氯硅烷、苯基二氯硅烷、甲基二氯硅烷、二苯基氯硅烷、甲基苯基氯硅烷、二乙基氯硅烷、三乙基硅烷)与丙烯腈的加成反应。在相同的反应条件下,对于七种硅烷的活性作定量的比较,发现加成产率百分数与相应的硅烷基团的诱导效应指数间形成一正 S 型曲线。改变烯腈结构(α-氰基丙烯酸乙酯、丙烯腈、α-甲基丙烯腈、α-乙基丙烯腈、丁烯腈),研究其在三氯硅烷加成反应中的影响,同样也得到产率百分数的正 S 型曲线。基于与 Grignard 试剂的反应和碱性水解作用,确定加成产物的结构。实验表明,硅原子系加在烯腈的β-碳上(β-加成)。根据结构活性关系的 S 型曲线讨论加成反应的机理。

 
<< 更多相关文摘    
图标索引 相关查询

 


 
CNKI小工具
在英文学术搜索中查有关tetramethyl-的内容
在知识搜索中查有关tetramethyl-的内容
在数字搜索中查有关tetramethyl-的内容
在概念知识元中查有关tetramethyl-的内容
在学术趋势中查有关tetramethyl-的内容
 
 

CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社