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Itiswellknownthat 9,9′ bis(methoxymethyl)fluo reneisparticularlysuitableforthepreparationofZiegler Nat tacatalystsforthefactthatitcanconferqualitiesfarsuperi or ,intermsofbalancedactivityandstereospecificityinthecopolymerizationofolefinsespeciallyinpolypropy lene ,tothosethatareobtainedwiththeethersknowninthepreviousarts[1— 3] . Severalmethodsofsynthesizing 9,9′ bis(methoxymethyl)fluorenefromdifferentrawmaterialshavebeenreportedinEuropeanpatents[4— 5] .Thediethersaregenerallysynthesize… 相似文献
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作为一种优秀的杀菌剂 ,2 ,4 ,4′ 三氯 2′ 羟基二苯醚在 2 0世纪 70年代投入使用 .本文制备了 3种羟基二苯醚化合物 ,确定了它们的液相色谱分离条件 .对三氯 2′ 羟基二苯醚的纯化条件进行了研究 ,发现活性炭、膨润土及三氧化二铝等脱色剂对粗产品中各个组分的脱色作用各不相同 :2 ,4 ,4′ 三氯 2′ 羟基二苯醚可以被活性炭吸附 ,产品中的有色杂质可以被氧化铝吸附 ,产品中无色杂质则可被膨润土吸附 相似文献
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1, 3：2, 4-di-p-methylbenzylidene-D-sorbitol （MDBS） is known to be an efficient sorbitol derivative gelator. Two new sorbitol derivative gelators were designed and synthesized in contrast to MDBS in order to study the gel properties of gelators with different structures. Their gelation behavior to 30 solvents was investigated. It was found that the gelation behavior was related to the molecular structure of gelators. Compared with MDBS, the gelator with more hydroxyl in the molecular structure could gel water and that with more aromatic ring could gel aromatic solvent. The fibrous and three-dimensional network of the gels was obtained by scanning electron microscopy （SEM）. Ultraviolet-visible （UV-Vis） spectroscopy revealed that π-π interaction was one of the main driving forces for the formation of gels. The π-π stacking of gelation increases with the number of aromatic rings in the molecular structure of gelator. Fourier transform infrared （FT-IR） spectroscopy revealed that the hydrogen bonding was also the main driving force for the formation of gels. The layered structure of the gels was studied by X-ray diffraction （XRD）. 相似文献
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以 2 ,6 二氯苯胺为原料 ,通过重氮化反应、取代反应、缩合反应与脱羧反应得到 3 氯 2 硝基甲苯的合成路线 ,确定了最佳反应条件 ,以 2 ,6 二氯苯胺为原料制取 2 ,6 二氯硝基苯 ,收率为 78.9% ;在N ,N 二甲基甲酰胺中以碳酸钾为催化剂 ,2 ,6 二氯硝基苯与氰基乙酸甲酯反应制取 2 氰基 2 (3′ 氯 2′ 硝基苯基 )乙酸甲酯 ,收率为 80 .2 % ;第三步通过水解反应获得 3 氯 2 硝基苯基乙酸 ,收率为 82 .6 % ;3 氯 2 硝基苯基乙酸通过脱羧反应得到最终产品 3 氯 2 硝基甲苯 ,产率为 72 .9% .采用红外光谱和核磁共振谱对产品进行了定性分析 相似文献
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Synthesis of Dibenzylidene Sorbitol Series Compound 总被引：1，自引：1，他引：1
Dibenzylidene sorbitol compounds are useful astransparency-improving agents for polypropylene andother resins, agents for gelling organic liquids, flow-ability-improving agents for paint, inks, adhesives,and other compositions, and solidifying agents for … 相似文献
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