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羟基
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  “—羟基”译为未确定词的双语例句
     THE PREPARATION OF 1, 3,5-TRI( 3, 5- DI- TERT. BUTYL 4 HYDROXY BENZYL ) S TRIAZINE 2, 4, 6 ( 1H, 3H, 5H )TRIONE
     1,3,5—三(3,5—二叔丁基—4—羟基苄基)—S—三嗪—2,4,6—(1H,3H,5H)三酮的研制
短句来源
     Oxidation of the products from the reaction of o-diaminobenzene with alkyl α-bromocarboxylate gave 2-hydroxv-3-alkylquinoxlines (R=-CH_3,-C_2H_5, -CH_2CH_2CH_3, -(CH_2)_3CH_3, -CH_2CH(CH_3)_2, -(CH_2)_5CH_3).
     邻苯二胺与α—溴代酸酯反应,产物经氧化后生成2—羟基—3—烃基喹噁啉(R=-CH_3,-C_2H_5,-CH_2CH_2CH_3,-CH_2(CH_2)_2CH_3,-CH_2CH(CH_3)_2,-CH_2(CH_2)_4CH_3)。
短句来源
     NMR STUDY OF 1,2,4,6 - TETRAPHENYL- 2- HYDROXYL -8-AZABICYCLO [3,2,1] OCTANE
     1,2,4,6—四苯基—2—羟基—8—氮杂双环[3、2、1]辛烷的核磁共振研究
短句来源
     The preparation method of antioxidant 1, 3, 5-tri (3, 5- di- tert.- butyl- 4 - hydroxy benzyl)-S-triazine- 2, 4, 6- ( 1H, 3H, 5H) trione and the optimum technoligical conditions are studied.
     研究了抗氧剂1,3,5—三(3,5—二叔丁基—4—羟基苄基)—S—三嗪—2,4,6—(1H,3H,5H)三酮的制备方法及最适宜的工艺条件。
短句来源
     Hexadecanoic acid-2-hydroxy-1- (hydroxymethyl) ethylester (Ⅲ) ;
     棕榈酸一2—羟基—1—羟甲基乙基酯(Hexadecanoic acid—2—hydroxy—1—(hydroxymethyl)ethyl ester)(Ⅲ);
短句来源
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  相似匹配句对
     -hydroxy-benproperine and 5-hydroxypropranolol by NMR, respectively.
     5-羟基普萘洛尔。
短句来源
     Synthesis of Two Alkyl Glycolates
     羟基乙酸酯的合成
短句来源
     Natrii γ-Hydroxybutyras
     γ羟基丁酸钠
短句来源
     The Synthesis of p - Hydroxybenzaldehyde
     对羟基苯甲醛合成
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Synthesis of (20RS)-20-O-Hydro-20-trifluoromethylpoststerone
      
The structure and strain relief of TiNi alloy are examined following combined deformation consisting of quasi-hydro-extrusion followed by uniaxial compression.
      
The behavior of R and ρ correlates with the thermoemf data obtained at the quasi-hydro-static pressure P up to 3 GPa.
      
Only 7β-hydroperoxide and 7α-hydro-peroxide of cholesteryl acetate were found, as reported in the literature for cholesterol.
      
Synthesis of poly(glycolide-CO-2-hydro-2-oxo-1,3,2-dioxaphosphorinane)
      
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Vanillalrhodanine was found to be an excellent reagent for silver ions. Its 0.2 percent solution in acetone gives a brownish violet precipitate with silver ions in ammoniacal solution. Limit of identification: 0.01γ. Concen- tration limit: 1∶5,000,000. Merecric and merourous ions give same reactions, but they can be removed by the addition of aqueous ammonia and the test is to be carried out in the filtrate. Ferric ions, when present in high concentra- tions, interfere the observation of silver.

3甲氧基4羥基亞苄羅丹寧可以用作銀離子的斑點試劑。其千分之二丙酮溶液與銀離子在含氨溶液中生成棕紫色沈澱。鑑定限度為0.01_γ,濃度界限爲1∶5,000,000。普通離子除汞外皆不干擾。鐵鹽在濃度高時,才妨碍銀的鑑定。

Mu-feng-chin has been used as a diuretic and dropsic, etc. in Chinese medicine for many years. Four substances have been isolated by the author from a sample of Mu-fong-chi brought in Shanghai, and the details of the isolation and chemical properties of two of them, viz. Mu-fong-chin A and B, have been reported in previous papers of this series elsewhere. The present paper deals with Mu-fong-chin C, which has the molecular formula C_(18)H_(21)O_(10) and a melting point 180-181℃. Mu-fong-chin C was shown to be...

Mu-feng-chin has been used as a diuretic and dropsic, etc. in Chinese medicine for many years. Four substances have been isolated by the author from a sample of Mu-fong-chi brought in Shanghai, and the details of the isolation and chemical properties of two of them, viz. Mu-fong-chin A and B, have been reported in previous papers of this series elsewhere. The present paper deals with Mu-fong-chin C, which has the molecular formula C_(18)H_(21)O_(10) and a melting point 180-181℃. Mu-fong-chin C was shown to be a phenolic substance, it probably contains phenolic OH, methylenedioxy, aldehyde and methoxy groups.

提去木防巳甲乙二素的母液以醚去油、脂、蠟及色素等後,母液濃縮,以熟戊醇及热水交互處理,分離得一種棕黄色結晶。融點180—181℃,定名為木防巳丙素。分子式為C_(18)H_(21)O_(10)。其分子中可能含有酚性羟基、甲二氧基、醛基及甲氧基等,其初步暫定構造式為

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。

 
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