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二甲基
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     A colour reaction of Cr(Ⅵ) with 6,6″ dismethyl 4′ phenyl 2,2′:6′,2″ terpyridine(TPY) was studied by spectrophotometry.
     研究了 6 ,6″—二甲基— 4′—苯基 - 2 ,2′ :6′ ,2″—三联吡啶 (TPY)与Cr(Ⅵ )的显色反应。
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     Synthesis of 2,5—Dimethyl—2,4—Hexadiene
     2,5—二甲基—2,4—己二烯的合成
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     A NEW SYNTHETIC ROUTE TO (E,E)-2,8-DIMETHYL-5-ISOPROPENYL-2,8-DECADIEN-1, 10-DIOL
     (E,E)—2,8—二甲基—5—异丙烯基—2,8—癸二烯—1,10—二醇的新合成路线
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     A new ligand 5,12 diphenyl 7,14 dimethyl 1,4,8,11 tetraazacyclote tradecane N,N′,N″,N tetraethylcyanide and its Cu(Ⅱ),Ni(Ⅱ) complexes were synthesized and characterized by elemental analysis, IR, ′H NMR,UV Vis spectra and conductivity measurements.
     合成了5,12—二苯基—7,14—二甲基—1,4,8,11—四氮杂环+四烷—N,N′,N″,N—四(3—丙腈)及其Cu(Ⅱ)和Ni(Ⅱ)配合物,并对它们进行了元素分析及IR、′HNMR、UV—Vis和电导测定等表征。
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     SYNTHESIS OF 3, 4-DIOMETHYL-2-PHENYL-1, 4-OXAZEPINE-5 ,7-DIONE
     3,4—二甲基—2—苯基—1,4—氧氮杂—5,7—二酮的合成
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  相似匹配句对
     Preparation of Dimethyl Disulfide
     二甲基二硫的研制
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     Synthesis of Dimethyl disulfiude
     二甲基二硫的合成
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     Study on the Synthesis of N,N-Dimethyl Isopropanolamine
     N,N二甲基异丙醇胺的合成研究
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     Study on analytical method for O,O-dimethyl phosphoramide thioate in surface water by gas chromatography
     地面水中O,O二甲基硫代磷酰胺的气相色谱分析
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  dimethyl-
MTT (3-(4,5-dimethyl-2-thiazol)-2,5-diphenyl-2H tetrazolium bromide) assay was performed to evaluate the in vitro cytotoxicity.
      
Synthesis and Antimicrobial Evaluation of Some t(3)-Alkyl and t(3),t(5)-Dimethyl-r(2),c(6)-DI-2'-Furfurylpiperidin-4-one and its
      
Synthesis and biological evaluation of 5,7-diaryl-4,4-dimethyl-4,5,6,7-tetrahydropyridino[3,4-d]-1,2,3-thiadiazoles
      
Then, compound 3 was reacted with dimethyl-formamide dimethyl acetal yielding vinylogue amides 4 and 5.
      
Spectroscopic and electrochemical investigation of two of the compounds, sodium 1-phenyl-2,3-dimethyl-4-aminopyrazolone 5n(4)-methanesulfonate (PPNa) and 1-(3'-sulfophenyl)-3-methylpyrazolone (SPP), was performed.
      
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Von Knorre first suggested the use of benzidine and o-tolidine for the determination of tungsten. With the latter reagent, he succeeded also in separat- ing tungstate from phosphate. Later on, o-dianisidine and vanillylidene benzidine have been proposed as precipitants for tungstate. The optimum pH ranges for the quantitative precipitation of tungstate by means of these precipitants and tetraminodiphenyl, which have not yet been found in the literature, are: benzidine pH: 2.0-5.5 o-tolidine 2.9-4.7 o-dianisidine...

Von Knorre first suggested the use of benzidine and o-tolidine for the determination of tungsten. With the latter reagent, he succeeded also in separat- ing tungstate from phosphate. Later on, o-dianisidine and vanillylidene benzidine have been proposed as precipitants for tungstate. The optimum pH ranges for the quantitative precipitation of tungstate by means of these precipitants and tetraminodiphenyl, which have not yet been found in the literature, are: benzidine pH: 2.0-5.5 o-tolidine 2.9-4.7 o-dianisidine 2.0-4.1 vanillylidene benzidine 1.7-3.9 tetraminodiphenyl 1.7-4.8 The effect of introducing various groups into the benzidine molecule upon the tungsten precipitating property is not profound. The relation between quantitative precipitation of tungstate with benzidine and the product of concentrations of both constituents before precipitation Was studied. It is found that quantitative precipitation of tungstate ions Can be realized only when the product of concentrations of reactants before precipitation is equal to or greater than 0.8 × 10~(-5), and the moles of benzidine added must be at least equal to that of tungstate. The gravimetlic determination of tungsten by means of o-tolidine may be applied to samples containing as low as 10 mg of rungsten trioxide in 200 ml solution, if an absolute error of 0. 5 mg can be tolelxted. For larger quantities of tungsten present in sample, the absolute errors amount to only 0.1-0.2 mg. Tetraminodiphenyl may be used as a tungsten precipitant, but no advantage over benzidine Wan found in our present studies.

1.用二胺聯苯及其數種衍生物沉澱鎢酸根時,其適宜的pH範圍如下:[4,4′]二胺聯苯 pH:2.0-5.5[3,3′]二甲基[4,4′]二胺聯苯 2.9-4.7[3,3′]二甲氧基[4,4′]二胺聯苯 2.0-4.1[4]對胺聯苯氮甲烯[2]甲苯酚 1.7-3.9[3,4,3′,4′]四胺聯苯 1.7-4.8 2.用[4,4′]二胺聯苯作沉澱劑時,二胺聯苯和鎢酸根在沉澱前的濃度之乘積與後者沉澱完全與否的關係,曾加研究。 3.用[3,3′]二甲基[4,4′]二胺聯苯作沉澱劑時,能测定低至10毫克的三氧化鎢。

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。

 
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