共查询到20条相似文献,搜索用时 68 毫秒
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用2-硫代-3-正丁基-5-苯基亚甲基-4-咪唑啉二酮(1)的S-烷基化反应合成了新型2-烷硫基-3-正丁基-5-苯基亚甲基-4H-咪唑啉-4-酮衍生物(2)。对影响S-烷基化反应的条件进行了优化,优化条件如下:2-硫代-4-咪唑啉二酮5mmol、卤代烷6mmol和无水碳酸钾8mmol;反应温度50°C或室温;反应时间2~3h。优化条件下2a~2e的收率为43%~81%。探讨了所合成化合物的波谱性质,其结构经元素分析、IR、1HNMR和MS确证。 相似文献
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李文苗;杜耀;王志远;周芙蓉 《化工中间体》2013,(11):42-45
研究了以盐酸乙脒和丙二酸二乙酯为原料,以甲醇钠为倦化剂制备1,1-二氨基-2,2-二硝基乙烯的中间体2-甲基-4,6-嘧啶二酮的方法。确定了最佳工艺条件,在该工艺条件下,2-甲基-4,6-嘧啶二酮的的得率达80%以上。与其他催化剂相比,采用甲醇钠作为催化荆,产品得率高,工艺条件温和,易于控制。 相似文献
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本文叙述了高效低毒杀虫剂1-二嗪甲基-2-硝基次甲基咪唑啉和1-二嗪甲基-2-硝亚氨基咪唑啉的制备和生物活性。 相似文献
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《精细化工原料及中间体》2005,(10):53-53
1,3-二甲基咪唑啉酮,简称1,3-DMI,是1种强极性非质子溶剂,并对各种试剂有活化性质,可代替有致癌性的HMPA。其生产原理为:尿素与乙二胺在乙二醇溶液中进行合环反应生成2-咪唑啉酮,2-咪唑啉酮和甲醛及甲酸反应生成1,3-DMI。 相似文献
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Cellulose β-ketoesters with branched alkenyl chains were prepared using cis-9-octadecenyl ketene dimer (OKD) and LiCl/1,3-dimethyl-2-imidazolidinone (DMI) as the esterifying reagent and cellulose solvent, respectively. Relationships between degree of substitution (DS) of the cellulose/OKD β-ketoesters and reaction conditions were studied in detail. The results showed that DS values of the products were controllable up to 2.1 by selecting the reaction conditions. Solution- and solid-state 13C-NMR analyses revealed that cellulose backbones of the cellulose/OKD β-ketoesters with DS 2.1 behave like solid in chloroform owing to strong restriction on movement of cellulose chains by the long and branched alkenyl substituents introduced. Size-exclusion chromatographic analysis showed that little depolymerization occurred on cellulose during β-ketoesterification at room temperature, and that molecules of the cellulose/OKD β-ketoesters with DS 2.1 had semi rigid-rod conformation in tetrahydrofuran. Thus, cellulose β-ketoesters with densely substituents like polymer brushes or comb-shaped polymers were prepared in this study. 相似文献
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4-氯-4,5-二甲基-1,3-二氧杂环戊烷-2-酮合成工艺研究 总被引:1,自引:0,他引:1
以羟基丁酮为原料 ,经酰化、环合等步骤合成医药中间体 4 氯 4 ,5 二甲基 1,3 二氧杂环戊烷 2 酮 ,合成收率达 86 %以上 相似文献
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碘掺杂聚苯胺催化剂催化合成苹果酯-B的研究 总被引:4,自引:0,他引:4
以I2/PAn为催化剂,对以乙酰乙酸乙酯和1,2-丙二醇为原料合成苹果酯-B的反应条件进行了研究。实验表明:I2/PAn是合成苹果酯-B的良好催化剂,较系统地研究了原料物质的量比、催化剂用量、反应时间诸因素对产品收率的影响。最佳反应条件为:n乙酰乙酸乙酯∶n1,2-丙二醇=1∶1.6,催化剂用量为反应物料总质量的0.6%,环己烷为带水剂,反应时间0.75h。上述条件下,苹果酯-B的收率可达80.9%。 相似文献
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为了探索合成N-二氯乙酰基噁唑烷类除草剂安全剂的合成工艺,合成了3-二氯乙酰基-2,5-二甲基-2-正丙基-1,3-噁唑烷.以异丙醇胺、2-戊酮和二氯乙酰氯为原料,以氢氧化钠水溶液为缚酸剂,合成了标题化合物.采用红外光谱、核磁共振谱和元素分析对产品进行了结构表征.研究了合成过程中溶剂、反应温度、搅拌时间、摩尔比及缚酸剂对产物产率的影响,确定了合成标题化合物的较优反应条件为:以氢氧化钠为缚酸剂,三氯甲烷作溶剂,反应温度3~8℃,搅拌时间2 h,异丙醇胺与2-戊酮的摩尔比为1:1.3,产率为50.0%.本方法原料价廉易得、路线简单、反应条件温和,适于工业化制备目标产物. 相似文献
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A method for the chemical recycling of poly(carbonate) (PC) plastic wastes in the forms of bisphenol A (BPA) and 1,3-dimethyl-2-imidazolidinone (DMI) was investigated. Treatment with N,N′-dimethyl-1,2-diaminoethane (DMDAE) of PC pellets or PC wastes, derived from compact discs, in dioxane with/without a catalytic amount of base (e.g. Na2CO3 0.5 mol%) for a short period at 100 °C produced DMI and BPA, both in nearly quantitative yields. The aminolysis reaction can be carried out also in DMI, thus saving the use of conventional solvents. A sequential profile of this reaction was verified by examining two model reactions of diphenyl carbonate with N-methylbutylamine and DMDAE, respectively, both proceeded through low-activation energy processes. 相似文献
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《精细与专用化学品》2016,(2)
以2-咪唑烷酮及三光气为原料,合成了阿洛西林钠的关键中间体1-氯甲酰基-2-咪唑烷酮。研究了反应溶剂、滴加时间、原料配比、母液利用对反应收率的影响,在最佳工艺条件下收率能达到90%以上。 相似文献
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以新戊二醇、三氯氧磷及N-羟甲基丙烯酰胺为原料,在三乙胺作为缚酸剂、氯化亚铜作催化剂的条件下,合成了新型膨胀型阻燃剂5,5-二甲基-2-磷杂-1,3-二噁烷-2-基丙烯酰胺甲氧基磷酸酯,采用元素分析、FT-IR、1HNMR等分析测试技术对其结构进行了表征。当n(N-羟甲基丙烯酰胺)∶n(三乙胺)=1∶1,CuCl占N-羟甲基丙烯酰胺质量分数1.5%时,先冰水浴反应2 h,再室温反应10 h,产物产率达到75.3%。并利用TG、DSC热分析技术对该化合物的热性能进行了分析。TG曲线显示其初始分解温度是210℃,800℃时残炭率约40%,说明该化合物具有较好的热稳定性和成炭性。 相似文献
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Lili Zhi Yanqing Li Xiaobing Cao Yahui Li Xian Cui Lijie Ci Jinquan Wei 《Nanoscale research letters》2017,12(1):632
Perovskite solar cells (PSCs) have great potentials in photovoltaics due to their high power conversion efficiency and low processing cost. PSCs are usually fabricated from PbI2/dimethylformamide solution with some toxic additives, such as N-methyl pyrrolidone and hexamethylphosphoramide. Here, we use an environmental friendly aprotic polar solvent, 1,3-dimethyl-2-imidazolidinone (DMI), to fabricate perovskite films. By adding 10 vol% DMI in the precursor solution, high-quality perovskite films with smooth surface are obtained. By increasing annealing temperature from 100 to 130 °C, the average grain size of the perovskite increases from ~?216 to 375 nm. As a result, the efficiency of the PSCs increases from 10.72 to 14.54%. 相似文献