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|  | | 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。 | |
5,5-Diphenylglycocyamidines bearing an alkyl group in position 3 are partly rearranged to the corresponding N2-alkyl derivatives on heating with alcoholic ammonia in the presence of ammonium acetate.
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The reactions of 2, 3-dihydrothiazolo- (I) and 2, 3-dihydrothiazino-1, 3-[2, 3-b]benzthiazolium chlorides (II) with water, aqueous sodium hydroxide, aqueous alcoholic ammonia, and hydrazine hydrate are investigated.
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| | The condensation of thiourea with ethyl methyl-acetoacetate in the presence of sodium ethylate in absolute ethyl alcohol gives 2-thio-4,5-dimethyl-6-oxy-pyrimidine, m.p. 279-280°, which is ethylated to form 2-ethylmercapto-4,5-dimethyl-6-oxy-pyrimidine, m.p. 155-156°, by treating the former with ethyl iodide in the presence of sodium ethylate in absolute alcohol. 2-Ethyl mercapto-4,5-dimethyl-6-oxy-pyrimidine reacts with phosphorous oxychloride to form its corresponding chloro-compound, 2-ethylmercapto-4,5-... | | 1.甲醇鈉對於2-乙硫醇基-4,5-二甲基-6-氯代嘧啶在甲醇溶液中生成相應的乙硫醇基嘧啶甲醚。 2.氯對於2-乙硫醇基-4,5-二甲基嘧啶衍生物(I),在水溶液中的作用是特殊的,嘧啶中的不飽和現象不被氯化反應改變而硫醇基團被氧化,形成穩定相應嘧啶碸的衍生物(II),因此製備了2-乙磺醯基-4,5-二甲基-6-甲氧基嘧啶和2-乙磺醯基-4,5-二甲基-6-氯代嘧啶. 3.2-乙硫醇-4,5-二甲基-6-甲氧基嘧啶在甲醇中進行氯化反應,現象甚複雜,並且嘧啶碸的產量很低,2-乙硫醇-4,5-二甲基-6-甲氧基嘧啶在甲醇中被氯氧化,首先形成嘧啶碸,後者並不穩定,再與氯作用形成乙磺醯氯和2-氯代-4,5-二甲基-6-甲氧基嘧啶。 4.嘧啶碸與鹼作用,乙磺醯基被羥基取代,同時在嘧啶環6位上的乙氧基保留,因此2-乙磺醯基-6-甲氧基-4,5-二甲基嘧啶與鹼作用,形成2-酮-5,6-二甲基-4-甲氧基-1,2-二氫嘧啶。 5.酒精-氨的溶液作用在氯代乙磺醯基嘧啶得到氨基-乙磺醯基嘧啶,在氯代乙磺醯基嘧啶中,嘧啶環上2位的乙磺醯基仍保留,而6位土的氯被氨基取代。 6.本文敘述了合成4,5-二甲基-2-氧代-6-氨... | | 文摘来源 | |   |
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