共查询到20条相似文献,搜索用时 46 毫秒
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本文以氟乙醇和对甲苯磺酰氯为原料制备了对甲苯磺酸氟乙酯,讨论并确定了较佳的合成工艺条件,在酰氯/氟醇投料比为1、2、15℃下反应2小时,其氟酯的收率为82.7%。 相似文献
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研究对甲苯磺酰氯与乙二醇制备单对甲苯磺酸乙二醇酯的合成工艺。结果表明:室温反应条件下,n(对甲苯磺酰氯):n(乙二醇)=1:14,可以合成出目标产物,收率可达40%,其结构经过1H NMR表征。 相似文献
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对甲苯磺酰基是亲核取代反应中一个很好的离去基团,其酯远比相应的氯化物活泼。二对甲苯磺酸多甘醇酯已广泛用于冠醚化合物的合成。四对甲苯磺酸季戊四醇酯的合成及应用未见报道。作者按下列方法合成了四对甲苯磺酸季戊四醇酯。 相似文献
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本文论述了合成对甲苯磺酸的四种方法,分别采用硫酸、三氧化硫、氯磺酸等三种不同的磺化剂,并对这四种方法进行了比较,认为采用三氧化硫磺化法生产对甲苯磺酸具有一定的优势。同时简述了对甲苯磺酸的精制和分析方法。 相似文献
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对甲苯磺酸作为己二酸和正丁醇的酯化催化剂 ,性能优于硫酸。探讨并找到其较好的反应条件 ,酯化率达95.17%。 相似文献
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恶唑化合物是一类生理活性物质。当其分子中引入含氟基团时能增强其活性。提出了引入含氟基团的典型方法。 相似文献
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Yue Zhang Yan Wang Huimin Zhang Xi Wang Yongxiang Zhao Jun Liu Feng Wang 《Journal of surfactants and detergents》2014,17(5):967-975
In this article, a series of novel hyperbranched fluorinated polymer with polyglycerol (PG) as the hydrophilic core and poly(2,2,2‐trifluoroethyl methacrylate) (PTFEMA) as solvophobic arms were synthesized. When the atom transfer radical polymerization was carried out using N,N‐dimethylformamide (DMF) as the solvent, [M]/[I] ratio of 200, and [CuBr]/[NBr] ratio of 0.1 at 30 °C, controlled polymerization was achieved. The surface active properties of the polymer at the dimethyl sulfoxide (DMSO)/air and chloroform/water interface were studied by pendant drop measurements. The results showed that the copolymers could reduce surface tension (interfacial tension) in a manner analogous to the conventional surfactant in aqueous solutions. Thermodynamic analysis suggested that the solvophobic PTFEMA chains play an important role in determining the driving force of the aggregate formation in DMSO. 相似文献
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《Journal of Sulfur Chemistry》2013,34(5):427-432
A rapid, efficient method is described for synthesis of aryl toluenesulfonhydrazides from toluene-sulfonyl chloride and substituted phenylhydrazines and for the synthesis of aryl toluenesulfonates from toluenesulfonyl chloride and substituted phenols. The procedure is simple, environmentally benign and occurs in good yields. 相似文献
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介绍了从精喹禾灵废水中的对甲苯磺酸盐(钠盐、钾盐)回收对甲苯磺酰氯的方法。废水酸化后,通入氯气制得对甲苯磺酰氯,含量大于98%,收率大于95%。 相似文献
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Sergio Rossi Maurizio Benaglia Franco Cozzi Andrea Genoni Tiziana Benincori 《Advanced Synthesis \u0026amp; Catalysis》2011,353(6):848-854
The first organocatalytic, stereoselective and direct aldol reaction of activated thioesters with aldehydes has been accomplished. The trichlorosilyl ketene thioacetal generated in situ by adding a tertiary amine to a trifluoroethyl thioester in the presence of tetrachlorosilane is activated by catalytic amounts of an enantiomerically pure biheteroaromatic phosphine oxide to react with different aldehydes, coordinated to as well as activated by the chiral cationic hypervalent silicon species. Starting from a variety of readily available thioesters, this Lewis acid‐mediated Lewis base‐catalyzed transformation allows the direct synthesis of syn‐β‐hydroxy thioesters in up to 95% ee. 相似文献
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以糠醛为基础原料,经维生素B1催化合成糠偶姻,再由糠偶姻分别和乙酰氯(Ⅰ),月桂酰氯(Ⅱ),苯甲酰氯(Ⅲ),α-呋喃甲酰氯(Ⅳ),3-α-呋喃烯丙酰氯(Ⅴ)反应,吡啶为催化剂和溶剂,在30-40℃的水浴条件下合成了相对应的糠偶姻单酯类化合物。Ⅰ、Ⅱ、Ⅲ、Ⅳ和Ⅴ的收率以糠偶姻计分别为97.3%、96.5%、97.0%、95.4%和94.3%。其中Ⅱ、Ⅳ和Ⅴ是国内外文献未公开报道的新型糠偶姻单酯类化合物。通过元素分析、MS谱1、HNMR谱对所合成的目标产物(Ⅰ、Ⅱ、Ⅲ、Ⅳ和Ⅴ)分别进行了全面的表征,证实了其分子结构式。Ⅱ、Ⅳ和Ⅴ的新颖性已为吉林大学查新检索咨询中心(教育部科技查新工作站)的2006年10月30日出具的第20060431Z0401212号《科技查新报告》所证实。 相似文献
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