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10,10''''-二溴-9,9''''-联蒽类化合物的合成研究 总被引:1,自引:0,他引:1
研究了9,9'-联蒽和10,10'-二溴-9,9'-联蒽的合成方法。结果表明,在乙醇中用锌粉和浓盐酸为还原剂,9-蒽酮还原偶合得到高产率的9,9',10,10'-四氢-9,9'-二羟基-9,9'-联蒽(1)和少量9,9'-联蒽(2),该混合物在甲苯中用五氧化二磷脱水转化为9,9'-联蒽,后者溴代得到10,10'-二溴-9,9'-联蒽(3)。该方法反应条件温和,纯化简单,易于实施。 相似文献
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研究了9,9’-联蒽和10,10’-二溴-9,9’-联蒽的合成方法。结果表明,在乙醇中用锌粉和浓盐酸为还原剂,9-蒽酮还原偶合得到高产率的9,9’,10,10’-四氢.9,9’-二羟基.9,9’-联蒽(1)和少量9,9’-联蒽(2),该混合物在甲苯中用五氧化二磷脱水转化为9,9'-联蒽,后者溴代得到10,10'-二溴-9,9’-联蒽(3)。该方法反应条件温和,纯化简单,易于实施。 相似文献
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研究了(R)-1,1’-联萘-2,2’-二甲酸的合成方法,设计了一条合适的合成路线并进行了优化。以(R)-联二萘酚为起始原料,依次经过羟基的三氟甲基磺酸化反应、甲基化反应、溴代反应、水解反应,最后氧化成(R)-1,1’-联萘-2,2’-二甲酸。在相关文献和专利的基础上,进行了创新,合成路线简单易行,具有应用价值。 相似文献
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以溴苯为起始原料,经过格氏反应,偶联反应,加成反应,酸催化闭环合成了2-溴-9,9'-螺二芴,最后与二苯基膦锂锂化反应合成目标化合物二苯基-2-(9,9'-螺二芴基)膦,总收率为60.6%。通过1H NMR确证了目标化合物的结构。 相似文献
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采用浸渍法制备硅胶(SG)/对甲苯磺酸(p-TSA)催化剂,并用XRD对其进行了表征。利用冰醋酸和无水乙醇为原料,以SG/p-TSA为催化剂合成乙酸乙酯。考察了反应时间,催化剂的用量,原料配比等对该反应的影响。最佳合成条件为:反应温度为100℃,反应时间为100 min,酸醇摩尔比为1.0∶1.9,催化剂用量为5%,产率为95.40%。催化剂不经处理可重复使用,使用3次以后的产率为81.11%。 相似文献
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Masafumi Fusayasu Takashi Sunamura Tsutomu Osawa 《The Journal of Supercritical Fluids》2010,54(2):231-236
The transesterification of supercritical ethyl acetate by a higher alcohol occurred at 573 K without the further addition of catalysts. The transesterification by a primary alcohol apparently obeyed zero-order kinetics with respect to ethyl acetate and the primary alcohol during most of the reaction. The transesterification was assumed to be a two-step reaction. The initial step is the hydrolysis of the supercritical ethyl acetate to acetic acid by the small amount of water in the reaction system. The later step is the esterification of the generated acetic acid with the higher alcohol. When a primary alcohol was used as the reaction partner for the supercritical ethyl acetate, a high yield of the transesterified product was obtained. On the other hand, when a secondary alcohol was used, a moderate yield was obtained. The moderate yield with a secondary alcohol would be due to the transformation of the transesterified product into unknown products. 相似文献
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Based on a previous investigation, a simulation model was used for optimization of coproduction of ethyl acetate and n-butyl acetate by reactive distil ation. An experimental setup was established to verify the simulated results. The effects of various operating variables, such as ethanol feed location, acetic acid feed location, feed stage of reaction mixture of acetic acid and n-butanol, reflux ratio of ethyl acetate reactive distillation column, and distil-late to feed ratio of n-butyl acetate column, on the ethanol/n-butanol conversions, ethyl acetate/n-butyl acetate purity, and energy consumption were investigated. The optimal results in the simulation study are as follows:ethanol feed location, 15th stage;acetic acid feed location, eighth stage;feed location of reaction mixture of acetic acid and n-butanol, eighth stage;reflux ratio of ethyl acetate reactive distillation column, 2.0;and distillate to feed ratio of n-butyl acetate, 0.6. 相似文献
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从理论上阐述以冰醋酸和醇为原料,浓H2SO4为催化剂合成醋酸酯的生产工艺,为提高酯的产率,通过比较酯化反应生成的水含量与产品酯、水形成的二元共沸混合物中的水含量的大小来确定酯化塔顶的水相是否参与回流。实际生产中验证这一确定方法是可行的,并得出结论:对于酯化合成法生产醋酸酯系列产品,分子量低于醋酸乙酯(包括醋酸乙醋)的酯,即分子量较小的酯,其酯化塔顶水相不参与回流;分子量大于或等于醋酸丙酯的酯,即分子量较大的酯,其酯化塔顶水相需要部分参与回流。 相似文献
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Sol-Gel负载磷钨酸催化合成乙二醇单乙醚醋酸酯 总被引:3,自引:0,他引:3
以醋酸和乙二醇单乙醚为原料,硅酸乙酯为硅源,通过溶胶-凝胶法(Sol-Gel)负载磷 钨酸为催化剂,合成了乙二醇单乙醚醋酸酯。实验结果表明:当正硅酸乙酯:水(mol/mol)=1∶4, 正硅酸乙酯:磷钨酸(W/W)=10∶1,醋酸:醇醚(mol/mol)=1.4∶1,催化剂用量为醇醚质量的 10%,带水剂甲苯用量为反应物质量的15%,反应时间为60 min时,收率可达96%以上。比较了 以硅胶直接负载磷钨酸作为催化剂的使用情况。 相似文献