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Lawesson试剂硫化合成N,N′—二苯基二硫代草酰胺 总被引:2,自引:0,他引:2
Lawesson试剂硫化合成N,N′┐二苯基二硫代草酰胺刘玮炜*纪延光黄超王苏广(淮海工学院食化系,连云港222005)N,N′-二取代二硫代草酰胺是一类用途较为广泛的含硫化合物,可用作抗氧剂[1]、除莠剂、杀菌剂[2]、止痛剂[3]、抗痨剂[4]等... 相似文献
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以Lawesson试剂与N,N-二正丁基草酰胺进行反应可制得,NN‘-二正丁基二硫代草酰胺,且后处理简单,收率高,产品纯度高。 相似文献
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硫代糠酸甲酯合成方法的改进 总被引:3,自引:0,他引:3
硫代糠酸甲酯广泛存在于咖啡、白千层油、烘烤芝麻油等天然食品中,具有肉香和海鲜类香气[1]。该香料化合物已由美国食用香料制造者协会(FEMA)和食用香料工业国际组织(IOFI)批准,用作食品增香剂和香味修饰剂,广泛用于调配肉香型、咖啡型和奶品香精中[2... 相似文献
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The pivaloyl chloride‐pyridine system has been utilized as a novel and efficient reagent for the preparation of nitriles from primary amides and aldoximes. The reaction proceeds smoothly under mild reaction conditions and the products are obtained in excellent yields. This method is applicable to a wide range of substrates including aromatic, heterocyclic and aliphatic species. The dehydration takes place at room temperature in the case of primary amides and dichloromethane at reflux temperature is required for rapid conversion in the case of aldoximes. 相似文献
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2-巯基乙醇装置加酸工艺技术改进,解决了产品有悬浮物、混浊、pH偏低和加酸中和时间长等问题,使产品质量达到国际先进水平,国内市场占有率80%,并大量出口。 相似文献
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研究了以无水碳酸钠为催化剂,红霉素肟与甲氧基乙氧基氯甲醚(MEMC)为原料,一步合成罗红霉素的实验过程。探讨了催化剂用量、反应物用量、反应溶剂选择、结晶方法等对反应的影响,在最佳条件下,罗红霉素的合成摩尔收率超过90%。 相似文献
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Asymmetric catalysis has established its unwavering position in organic chemistry as a particularly efficient strategy for the production of enantiomerically enriched compounds. For a truly practical synthetic protocol, however, asymmetric catalysis must be endowed with high atom economy and sustainability. Cooperative activation is a powerful strategy to drive efficient asymmetric catalysis without the use of stoichiometric activating reagents, leading to asymmetric catalysis with minimum waste production. This review summarizes the utility of thioamides as an emerging functional group class in cooperative asymmetric catalysis. Soft Lewis acid/hard Brønsted base cooperative catalysts, in which thioamides serve as either electrophiles or pronucleophiles, promote asymmetric C C bond-forming reactions with perfect atom economy. 相似文献
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牛磺酸合成工艺的改进 总被引:2,自引:0,他引:2
以乙醇胺为原料经酯化和磺化两步反应制得牛磺酸,通过对合成工艺的改进,缩短了反应时间,提高了收率,总收率为85.3%;且该法条件温和,操作简便,适合工业化生产. 相似文献