共查询到20条相似文献,搜索用时 116 毫秒
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双(1—甲酰胺基—3—芳酰基硫脲)的合成及环化 总被引:9,自引:1,他引:9
通过草二酰肼与芳酚异硫氰酸酯的加成反应制得一系列新的双(1-甲酰胺基-3-芳酰基硫脲)1。1在碱性溶液中可环化脱水为双(3-基-4-芳甲酰基-1,2,4-三唑啉-5-硫酮)2。所有产物均经元素分析;部分化合物经红外光谱,~1H NMR谱,质谱确定其结构。某些1类化合物具有较强的促进玉米胚芽生长的作用。 相似文献
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N,N-二(2-氯乙基)-磷酰基双硫脲的合成及除草活性研究 总被引:1,自引:0,他引:1
采用N,N-二(2-氯乙基)-磷酰基双异硫氰酸酯与不同的芳胺反应合成了7个N,N-二(2-氯乙基)-磷酰基双硫脲衍生物,它们的结构经1^H NMR、IR和元素分析证实。初步生测结果表明它们对单、双子叶植物根的生长具有较好的抑制活性。 相似文献
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O,O-二烷基硫代磷(膦)酸衍生物与二甲胺水溶液发生去烷基反应后,生成的硫代磷(膦)酸铵盐与三氯氧磷发生氯化反应,得到硫(酮)代磷(膦)酰氯,本文还讨论了该反应可能的机理。 相似文献
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当同一三稠环系三唑磷茂啉化合物中含有两个不同的磷原子时,它们不仅在光谱性质上有差别,而且在化学反应中的反应活性也不相同。本文报道三稠环系三唑磷茂啉化合物中环内磷与环外磷在硫化反应和亲核反应巾的选择性。 相似文献
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A variety of organometallic reagents have been found to undergo regioselective reaction with 1-aryl-vinamidinium salts and 3-aryl-3-chloropropeniminium salts. The products of such reactions were found to be α,β-unsaturated ketones and chlorovinyl amines, respectively. 相似文献
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前文报[1]道的硫代磷酰二氯在三乙胺存在下与邻苯二酚反应,不仅具有理论意义,而且是合成该类磷化物的新方法。本文将继续报道硫代磷酰一氯以及其它硫代四配位磷化物与邻苯二酚反应的结果,以期进一步揭示这类反应的本质及其影响因素。 相似文献
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Gold(I)‐Catalyzed Selective Heterocyclization of Propargylic Thioureas: Mechanistic Study of Competitive Gold‐Activation Mode 下载免费PDF全文
Yu Jiang Dr. Yin Wei Prof. Dr. Xiang‐Ying Tang Prof. Dr. Min Shi 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(21):7675-7681
A new selective gold(I)‐catalyzed intramolecular heterocyclization of propargylic thioureas has been developed, efficiently affording two kinds of cycloadducts in moderate to excellent yields with a broad substrate scope. Further mechanistic investigations indicate that competitive different gold activation modes feature in these cyclization processes. Kinetic experiments reveal that the gold activation mode is influenced by the ligand of the gold catalyst and the reaction conditions. 相似文献
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均三嗪含氮取代基衍生物的结构和性质 总被引:2,自引:0,他引:2
在B3LYP/aug-cc-pvDZ理论水平上研究了—CN、—NO2、—NH2、—N3 、—N2H、—NHNH2、—N4H和—N4H3等含氮取代基取代均三嗪环上的氢原子生成的衍生物, 预测了它们的分子构型、分解能及含能性质. 对衍生物分解能的研究结果表明, —CN 和—NH2取代的衍生物的分解能比未取代时更高, 而其余基团的取代使分解能降低; 取代基化合物的生成热越大, 取代均三嗪中的氢原子后生成衍生物的生成热也越大. —CN、—N3和—N4H取代的均三嗪衍生物的单位原子生成热为71.9、78.7 和82.6 kJ, 比文献报道的三叠氮基-均三嗪的(70.2 kJ)更高. —N4H、—N3 、—N4 H3 、—N2 H和—CN取代的均三嗪衍生物, 生成热为863.1-1735.2 kJ·mol-1, 但—N4H和—N4H3取代的衍生物分解能较小,稳定性较差. 相似文献
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V. V. Shchepin D. V. Fotin V. V. Fotin M. I. Vakhrin S. N. Shurov 《Russian Journal of General Chemistry》2004,74(7):1105-1107
Reformatsky reagents generated from alkyl esters of bromoacetic, -bromopropionic, -bromobutyric, and -bromoisobutyric acids react with alkyl esters of 6,8-dibromo-2-oxochromene-3-carboxylic acid to form alkyl esters of 6,8-dibromo-4-(1-alkoxycarbonylalkyl)-2-oxochromane-3-carboxylic acid. 相似文献
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Abstract T. Sigeru reported the reaction of 2-benzothiazolesulfen-amide with phosphites, but other P-reagents have not been used. we found that this compound can react with tris(dialkylamino)phosphines or bis(dialkylamino)phosphites to give products (I). No S-N bond cleavage was observed in the reaction performed as described by T. Sigeru. In the presence of subetituent in amino group, the reaction proceeds differently. 相似文献
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对苯乙烯-丙烯腈-二乙烯基苯(S/AN/DVB)交联共聚机理研究曾发现,丙烯腈作为第三单体,可使DVB竞聚率比在S/DVB共聚体系中降低,相互分离显著,从而有利于合成性能较好的离子交换树脂;本文在此基础上,将S/AN/DVB共聚体中的氰基水解成羧基来合成含磺酸、羧酸双功能基树脂,解决了前人研究中仅有50%的氰基水解成羧基的问题,并首次将这种树脂应用于混合氨基酸的分离。 相似文献
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A Rapid and Efficient Synthesis of Diaryl Thioureas via Solvent-Free Reaction Using Microwave 总被引:1,自引:0,他引:1
Jian Ping LI* Qian Fu LUO Yu Min SONG Yu Lu WANG College of Chemistry & Environmental Science Henan Normal University Xinxiang Key Laboratory of Environmental Science & Engineering of Henan Education Commission Xinxiang 《中国化学快报》2001,(5)
The application of microwave techniques for chemical synthesis has attracted considerable interest in recent years1-5. The reason is that technology can enhance the selectivity and reactivity6,7, increase the chemical yields and shorten the reaction time8,9. In order to provide a method that is economic, without pollution, easy to carry out, we coupled the solvent-free reaction with microwave.As we know, thiourea compounds are associated with a serious biological activities such as antiviral10… 相似文献