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以自制的9,9-双羟甲基芴(BHMF)和苯甲酰氯为原料,以三乙胺为吸收剂合成了9,9-双(苯甲酸甲酯基)芴,采用了红外光谱和核磁共振氢谱等分析测试手段对产品进行了结构表征并逐一归属。考察了原料配比、反应时间、反应温度及吸收剂用量等因素对9,9-双(苯甲酸甲酯基)芴收率的影响。实验结果表明,最佳工艺条件为:0.1 mol BHMF,n(BHMF)∶n(苯甲酰氯)=1.0∶3.0,三乙胺吸收剂为60 mL,反应温度10℃,反应时间4.0 h,在此条件下9,9-双(苯甲酸甲酯基)芴收率可达85.4%。 相似文献
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本文对2-氨基-9,9-二甲基芴的合成工艺进行研究。由芴为起始原料,通过选择不同的合成方法,改变反应条件,确定最佳的合成工艺。反应产物通过高效液相色谱检测其纯度,通过核磁共振确定结构,所得产物均与目标化合物相符。 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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无机氟化工氟资源综合利用发展现状与建议 总被引:1,自引:0,他引:1
无机氟化工被誉为"黄金"产业,在国民经济和社会发展中占有重要地位。介绍和分析了中国氟资源的存在形式、综合利用现状以及存在的问题。指出中国氟资源主要存在于萤石、磷肥副产物和电解铝废渣中。目前,中国氟化工生产主要以萤石资源为主,而萤石是不可再生资源,且面临资源短缺问题;磷肥副产物中的氟仍未充分开发和利用,造成大量氟资源的浪费;电解铝含氟废渣中的氟回收利用有待开发。提出了中国氟资源综合利用发展建议。 相似文献
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In this study, we have developed a simple, versatile, and rapid solvothermal process for the preparation of sodium metal fluoride (NaxMFy) nanopowders (NaCoF3, NaMnF3, and Na3FeF6) using a microwave digestion system. Microwave heating significantly reduces the reaction time compared to conventional heating methods. The NaxMFy nanopowders have cluster structures consisting of small primary nanoparticles, thus resulting in a large surface area of >60 m2 g−1. The effect of an essential additive is also investigated to confirm the optimal conditions for obtaining large-surface-area NaxMFy nanopowders without impurities. We expect that this study will promote further research into the development and application of various nanostructured NaxMFy materials. 相似文献
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氟化学品是人们开发的热点,含氟农药也是人们开发的关注点。阐述了全球含氟农药的概况,并介绍了近年新开发的含氟农药。 相似文献
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The system KF–AlF3 was reinvestigated precisely by differential thermal analysis, X-ray diffractometry, and visual observation. All of the samples for the present investigation were prepared by solution synthesis. The results verified the existence of 2KF·AlF3 (K2 AlF5 ) and KF·4AlF3 in the phase diagram; both compounds were orthorhombic. The cell parameters of the compounds were, respectively, a = 10.87 ± 0.03 Å, b = 10.36 ± 0.01 Å, c = 7.83 ± 0.03 Å, and a = 7.89 ± 0.01 Å, b = 7.57 ± 0.01 Å, c = 6.94 ± 0.01 Å. KAlF4 was confirmed to melt congruently at 575°± 2°C by careful examination. 相似文献
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Longfei Zhang Yiguang Jiang Zaiyang Wang Feng Guan Yanchao Li Xinqiang Yuan Long Zhang 《Journal of the American Ceramic Society》2022,105(3):2001-2009
Fluoindinate glass (FIG) is considered an ideal material for fiber laser devices and mid-infrared bulk optics components owing to its ultra-low phonon energy and broad transparency window. However, the heat generated by devices fabricated with FIG during their operation limits its application. Therefore, there is an urgent need to study its high-temperature properties. In this study, the thermal properties, microstructure, crystal phase behaviors, and optical and luminescent properties of high-temperature FIG were comprehensively evaluated. We also attempted to reveal the changes in its structure at high temperatures using variable-temperature Raman spectroscopy. We first found that the stretching vibration intensity of nonbridging F(Fnb) decreases, and the bending vibration of FIG increases with an increase in temperature, indicating that high temperatures could lead to the fracture of bridge bonds between some [InF6]3− octahedrons. Certainly, this will lead to glass structural instability, which will further increase the tendency of FIG to undergo devitrification in high-temperature conditions. We believe that this work will provide a reference for the performance improvement and application of fluoride glass at high temperatures. 相似文献
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热固性氟树脂在卷材涂料及喷涂铝单板涂料中的应用 总被引:6,自引:0,他引:6
热固性氟树脂用于卷材涂料涂装涉及到多项性能的平衡调整,本文从底漆和氟碳面漆的角度探讨了这些性能的影响因素。并根据树脂和配漆两方面所进行的试验,介绍了解决这些问题的方法。 相似文献