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
   - butoxide 的翻译结果: 查询用时:0.161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
 

- butoxide
相关语句
  相似匹配句对
     Preparation of Sodium tert-Butoxide
     叔丁醇钠的合成
短句来源
     STUDIES ON PIPERNOL BUTOXIDE RESIDUES IN PADDY
     稻谷中氧化胡椒丁醚(增效醚)残留研究
短句来源
     Purification of Piperonyl Butoxide from its Synthesis Product
     分子蒸馏技术提纯胡椒基丁醚的工艺研究
短句来源
     New Synthesis Technology of Sodium tert-Butoxide
     叔丁醇钠合成新工艺
短句来源
查询“- butoxide”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。
  - butoxide
Reaction of Unsaturated Esters with the Oxidative System Aluminum Tri-tert-Butoxide-tert-Butyl Hydroperoxide
      
Fluoro(phenyl)carbene generated by reaction of α-bromo-α-fluorotoluene with potassium tert-butoxide reacts with Schiff bases to afford the corresponding 2-fluoro-2-phenylaziridines.
      
Titanium(IV) tert-Butoxide-tert-Butyl Hydroperoxide System as Oxidant for C-H Bonds in Hydrocarbons and Oxygen-containing Compou
      
The system Ti(IV) tetra-tert-butoxide-tert-butyl hydroperoxide in mild conditions (20°C) oxidizes C-H bonds of methyl (toluene), methylene (hexane, ethylbenzene, benzyl ethyl ether), and methine (1, 1-diphenylethane, triphenylmethane) groups.
      
Zirconium tetra-tert-butoxide reacts with tert-bytyl hydroperoxide to form metal-containing peroxide and trioxide.
      
更多          


4-Methyl-5-ethyl-2-thiouracil,m.p.211°,was prepared according to the direc- tions of Johnson and Baily.4-Methyl-5-ethyl-uracil,m.p.236°,was formed in a 81% yield from 4-methyl-5-ethyl-2-thiouracil by boiling the latter with an aqueous solution of monochloroacetic acid.4-Methyl-5-ethyl-uracil reacted with phosphorous oxychloride and phosphorous pentachloride,giving 4-methyl-5-ethyl-2,6-dichloropy- rimidine in a 79% yield.This dichloropyrimidine boiled at 145° at 23mm,at 120° at 9mm,at 130° at 10mm,or at 130°...

4-Methyl-5-ethyl-2-thiouracil,m.p.211°,was prepared according to the direc- tions of Johnson and Baily.4-Methyl-5-ethyl-uracil,m.p.236°,was formed in a 81% yield from 4-methyl-5-ethyl-2-thiouracil by boiling the latter with an aqueous solution of monochloroacetic acid.4-Methyl-5-ethyl-uracil reacted with phosphorous oxychloride and phosphorous pentachloride,giving 4-methyl-5-ethyl-2,6-dichloropy- rimidine in a 79% yield.This dichloropyrimidine boiled at 145° at 23mm,at 120° at 9mm,at 130° at 10mm,or at 130° at 11mm;and melted at 33°.This dichloropyrimidine reacted with sodium methoxide in methyl alcohol,with sodium ethoxide in ethyl alcohol,with sodium n-propoxide in n-propyl alcohol,with sodium isopropoxide in isopropyl alcohol,with sodium n-butoxide in n-butyl alcohol,with sodium isobutoxide in isobutyl alcohol,with sodium isopentoxide in isoamyl alcohol and with sodium benzoxide in benzyl alcohol,giving the corresponding 2,6-dimethoxy-pyrimidine(b.p.113°/13mm,107°/7mm,115°/15mm,or 125°/ 18mm,),2,6-diethoxy-pyrimidine(b.p. 143°/20mm),2,6-di-n-propoxy-pyrimidine (b.p.131°/5mm),2,6-di-isopropoxy-pyrimidine(b.p.114°/5mm),2,6-di-n-butoxy- pyrimidine(b.p.175°/7mm),2,6-di-isobutoxy-pyrimidine(b.p.155°/5mm),2,6-di- isopentoxy-pyrimidine(b.p.170°/5mm)and 2,6-di-benzoxy-pyrimidine (b.p.221°/ 3mm)respectively. 4-Methyl-5-ethyl-2,6-dimethoxy pyrimidine rearranged partially in the pre- sence of methyl iodide at room temperature into 2-oxy-3,4-dimethyl-5-ethyl-6- methoxy-pyrimidine, m.p.81°,the structure of which was established by its be- havior on hydrolysis in the presence of concentrated hydrochloric acid,giving 3,4-dimethyl-5-ethyl-uracil,m.p.170-171°.Nevertheless,4-methyl-5-ethyl-2,6-di- methoxy-pyrimidine rearranged with ease into the isomeric and stable configura- tion,1,3,4-trimethyl-5-ethyI-uracil(b.p.190°/7mm,m.p.99-100°)by merely heat- ing at 280°-290° for six hours.Furthermore,the partially rearranged configura- tion,like 2-oxy-3,4-dimethyl-5-ethyl-6-methoxy-pyrimidine,was only stable,however, at this lower temperature;and further transformation into the isomeric and com- pletely rearranged modification took place by heating at 335-350° for six hours. In this case,1,3,4-trimethyl-5-ethyl-uracil(m.p.99-100°)was similarly isolated.

(1)4-甲基5-乙基-2,6-二氯代嘧啶曾用磷醯氯和五氯化磷与其相应的2,6-二羟基嘧啶作用制取。(2)4-甲基-5-乙基-2,6-二氯代嘧啶与醇钠作用,极易转变成4-甲基-5-乙基-2,6-二烷氧基嘧啶。(3)4-甲基-5-乙基-2,6-二甲氧基嘧啶和2-氧代-3,4-二甲基-5-乙基-6-甲氧基嘧啶在高温时重排成其稳定构型的(或称内醯胺)的异构体:1,3,4-三甲基-5-乙基-2,6-二氧代嘧啶。另一方面,4-甲基-5-乙基-2,6-二甲氧基嘧啶用碘代甲烷处理并长久放置则仅仅发生部分重排作用,得到2-氧代-3,4-二甲基-5-乙基-6-甲氧基嘧啶。

4-Methyl-2,6-dichloropyrimidine was prepared by heating 4-methyl-uracil with phosphorous oxychloride in the presence of phosphorous pentachloride; and it boiled at 97° at 7 mm, at 102° at 10 mm, or at 113° at 13 mm. 4-Methyl-2,6- dichloropyrimidine reacted with sodium methoxide in anhydrous methyl alcohol, forming 4-methyl-2,6- dimethoxy-pyrimidine, which was isolated by ether extraction and pnrified by vacuum distillation. Pure 4-methyl-2,6-dimethoxy-pyrimidine boiled at 85-87° at 7 mm, or at 103° at 13 mm,...

4-Methyl-2,6-dichloropyrimidine was prepared by heating 4-methyl-uracil with phosphorous oxychloride in the presence of phosphorous pentachloride; and it boiled at 97° at 7 mm, at 102° at 10 mm, or at 113° at 13 mm. 4-Methyl-2,6- dichloropyrimidine reacted with sodium methoxide in anhydrous methyl alcohol, forming 4-methyl-2,6- dimethoxy-pyrimidine, which was isolated by ether extraction and pnrified by vacuum distillation. Pure 4-methyl-2,6-dimethoxy-pyrimidine boiled at 85-87° at 7 mm, or at 103° at 13 mm, and melted at 62-65°. It was recrystallized from petroleum ether, m.p. 65-66°. In the above reaction, there was isolated a white solid, suspending in the ethereal solution and being collected separately. This white solid, considered as a by-product, was dissolved in hot water and acidified with acetic acid, whereupon it separated in needles. After recrystallization from water, it melted at 201-202°. It was tentatively assigned to be 4-methyl-2-methoxy- uracil. Further, 2,6-dialkoxy-pyrimidines were prepared similarly as 4-methyl-2,6-dimethoxy- pyrimidine: 4-Methyl-2,6-dichloropyrimidine reacted with sodium ethylate in anhydrous ethyl alcohol, forming 4-methyl-2,6-diethoxy-pyrimidine, which boiled at 110°/11 ram. 4-Methyl- 2,6-dichloropyrimidine was treated with sodium n-propoxide in normal propyl alcohol, forming 4-methyl-2,6-di-n-propoxy-pyrimidine, which boiled at 120°/5 mm. 4-Methyl- 2,6-dichloropyrimidine reacted with sodium iso-propoxide in isopropyl alcohol, forming 4-methyl-2,6-di-isopropoxy-pyrimidine, which boiled at 103°/3 mm. The action of sodium n-butoxide in normal butyl alcohoI upon 4-methyl-2,6-dichloropyrimidnie gave 4-methyl- 2,6-di-n-butoxy-pyrimidine, which boiled at 147-148°/5 mm. The action of sodium isobutoxide in isobutyl alcohol upon 4-methyl-2,6-dichloropyrimidine gave 4-methyl-2,6- isobutoxy-pyrimidine, which boiled at 132-133°/6 mm. The action of sodium isopentoxide in isopentyl alcohol upon 4-methyl-2,6-dichloropyrimidine gave 4 methyl-2,6-di-isopentoxy- pyrimidine, which boiled at 145-146°/3 mm. 4-Methyl-2,6-dichloropyrimidine reacted with sodium benzoxide in benzyl alcohol, giving 4-methyl-2,6-dibenzoxy-pyrimidine, which boiled at 231°/6 mm. 4-Methyl-2,6-dimethoxy-pyrimidine was heated in a sealed tube at 330-350°, giving the completely rearranged isomeric compound, 1,3,4-trimethyl-uracil, which was purified by vacuum sublimation at 130° at 10 mm and then by recrystallization from 95% alcohol. The latter melted at 107-109°. Nevertheless, 4-methyl-2,6-dimethoxy-pyrimidine was dis- solved in methyl iodide, and kept at room temperature in the dark with occasional shaking; whereupon the partially rearranged product, 2-oxy-3,4-dimethyl-6-methoxy-pyrimidine, gradually separated out. After recrystallization from absolutealcohol, it melted at 134-135.5°. Its structure was established as follows: Pure 2-oxy-3,4-dimethyl-6-methoxy-pyrimidine was heated with dilute hydrochloric acid for one hour; whereupon 3,4-dimethyl-uracil, m.p. 220-221°, separated out. This partially rearranged product, 2-oxy-3,4-dimethyl-6-methoxy- pyrimidine was heated at 335-350° and was again transformed into its stable and completely rearranged modification, 1,3,4-trimethyl-uracil, which was purified by vacuum sublimation and then recrystallization from 95% alcohol. The latter melted at 109-110°.

(1)4-甲基-2,6-二氯代嘧啶與鈉醇和醇的溶液作用,可以形成相應的2,6-二烴氧基嘧啶。 (2)4-甲基-2,6-二甲氧基嘧啶加熱至高温度即可轉變成其穩定結構的異構體1,3,4-三甲基-2,6-二羥基嘧啶。另一方面,在碘代甲烷催化劑的影響下,部份轉變成2-氧代-3,4-二甲基-6-甲氧基嘧啶;此化合物加熱卽可發生完全的轉變作用而形成其異構體1,3,4-三甲基-2,6-二羥基嘧啶。

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。

 
<< 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- butoxide的内容
在知识搜索中查有关- butoxide的内容
在数字搜索中查有关- butoxide的内容
在概念知识元中查有关- butoxide的内容
在学术趋势中查有关- butoxide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