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对合成噻吩-2,5-二羧酸的各种路线研究,以及对各种路线所得合成噻吩-2,5-二羧酸进行分析应用,确定了以己二酸和氯气为原料的工艺路线。该路线成本低,工艺简单,需要设备少,合成的产物品质好,收率高,污染少,更容易实现工业化生产。 相似文献
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2-氟-3-氯-5-三氟甲基吡啶是一种重要的含氟吡啶类中间体,在农药、医药合成中有广泛的应用。综述了2-氟-3-氯-5-三氟甲基吡啶的常用合成路线,并对各条合成路线作了比较和评价。 相似文献
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本文对目前4,4’-二氨基苯磺酰替苯胺的合成工艺路线进行了综合讨论。在考虑到原材料成本,生产操作环保性及是否会产生废酸等因素基础上,对各条工艺路线的优劣性进行了对比。以对硝基氯苯为原料,经双硫醚化,再经氯气氧化、酰胺化的工艺路线生产成本低、三废少,有工业化价值。 相似文献
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介绍了3条合成2,3-二氯-5-乙酰基吡啶的工艺路线,通过综合比较,优选出了最佳合成工艺路线,并确定了最佳合成工艺条件,为工业化生产提供了可靠依据。 相似文献
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本文对硫酸头孢噻利重要中间体7β-氨基-3-[3-氨基-2-(2-羟乙基)-吡唑鎓]甲基-3-头孢烯-4-羧酸二盐酸盐进行合成分析设计,探讨了其合成的策略,并对所选择的合成路线进行研究,通过对物料配比、温度、时间的考察进行合成工艺的优化,反应路线合理可行,反应条件温和,工艺操作简便,是一个适合规模化生产的方法。 相似文献
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介绍了中间体3-氨基-2-氯-4-甲基吡啶的9条合成工艺路线,从中选出较优的工艺路线进行合成研究,产品含量达到99.8%,收率达到65.4%. 相似文献
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以2 对氯苯基1 甲基5 三氟甲基2 吡咯啉3 腈为原料,经三步反应合成了4 溴1溴甲基2 对氯苯基5 三氟甲基吡咯3 腈,合成总收率为29.8%。 相似文献
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Vijay Kumar Patel Avnish Kumar Mishra Niraj Kumar Vishwakarma Chandra Sekhar Biswas Biswajit Ray 《Polymer Bulletin》2010,65(2):97-110
(S)-2-(Ethyl propionate)-(O-ethyl xanthate) (X1) and the newly synthesized (S)-2-(ethyl isobutyrate)-(O-ethyl xanthate) (X2) were used as the reversible addition-fragmentation chain transfer (RAFT) agents for the radical polymerization
of N-vinylpyrrolidone (NVP). The former showed the better chain transfer ability in the polymerization at 60 °C. Kinetics study
with X1 shows the psuedo-first order kinetics upto 45% monomer conversion. Molecular weight (M
n) of the resulted polymer increases linearly with increase in the monomer conversion upto around 45%. Polydispersity of the
corresponding poly(NVP)s increase gradually from 1.2 to 1.9 with increase in the monomer conversion. Chain-end analysis of
the resulted polymer by 1H NMR shows clearly that polymerization started with radical forming out of xanthate mediator. Living nature of the polymerization
was confirmed from the successful homo chain extension experiment and also the hetero-chain extension experiment involving
synthesis of poly(NVP)-b-polystyrene amphiphilic diblock copolymer. 相似文献
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Vijay Kumar Patel Niraj Kumar Vishwakarma Avnish Kumar Mishra Chandra Sekhar Biswas Biswajit Ray 《应用聚合物科学杂志》2012,125(4):2946-2955
(S)-2-(Ethyl propionate)-(O-ethyl xanthate) (X1) and (S)-2-(Ethyl isobutyrate)-(O-ethyl xanthate) (X2) were used as the reversible addition-fragmentation chain transfer (RAFT) agents for the radical polymerization of vinyl acetate (VAc). The former showed the better chain transfer ability in the polymerization at 60°C. Kinetic study with both RAFT agents showed pseudo-first order kinetics up to around 85% monomer conversion. Molecular weight of the resulting polymer increased linearly with increase in the monomer conversion up to around 85%. The observed molecular weights calculated from 1H-NMR spectrum [Mn(NMR)] are close to the corresponding theoretical molecular weights [Mn(theor)]. The corresponding polydispersity index (PDI) of the resulting polymers remained almost constant at around 1.2 up to ∼ 65% monomer conversion and then increased gradually with the further increase in the monomer conversion. Chain-end analysis of the resulting polymers by 1H-NMR showed clearly that polymerization started with the radical forming out of the xanthate mediator. The negligible homo-chain extension and the hetero-chain extension involving synthesis of poly(VAc)-b-poly(NVP) diblock copolymer were occurred. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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以吲哚-4-甲醛、对甲基苯肼和对氯苯胺为原料,合成了1-(4-甲苯基)-3-(4-吲哚基)-5-(4-氯苯基)甲臢。经红外、核磁和质谱等波谱鉴定了目标分子的结构,并测定了它的氧化还原电位值。 相似文献