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以4,4'-二取代联苯(或4,4'-二取代二苯甲烷)为原料合成了几种新的3,7-二取代二苯并环状溴(鎓)盐.对几种溴(鎓)盐与KBH4及与NaN3的反应进行了研究.结果表明,前一反应主产物为2-溴-4,4'-二取代联苯(或2-溴-4,4'-二取代二苯甲烷),后一反应的主产物为2-叠氮基-2'-溴-4,4'-二取代联苯(20a-20d).通过20a-20d的热反应合成几种新的多取代咔唑(21a-21d). 相似文献
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以亚胺酯盐酸盐和脒为原料,在铜催化下一锅法合成对称及非称二取代1,2,4-三唑衍生物。之前报道的合成方法仅限于合成对称芳基二取代1,2,4-三唑衍生物,在合成非对称二取代1,2,4-三唑时,由于底物的自聚和混聚造成不对称和对称的1,2,4-三唑产物同时产生,并且由于它们非常接近的R_f值而难以分离。该方法解决了从简单底物出发难以直接合成非对称芳基二取代1,2,4-三唑衍生物的问题,为合成非对称芳基二取代基1,2,4-三唑衍生物提供了一种有效的合成方法。 相似文献
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《有机化学》2021,(1)
3,3'-二吲哚甲烷类化合物是一类重要的吲哚生物碱,其结构单元广泛存在于天然产物、功能性材料以及合成药物分子中.因其具有多样的生物活性和功能,如抗氧化、抗炎症、抗血管生成、抗菌以及抗癌活性等,构筑3,3'-二吲哚甲烷类杂环化合物备受关注.传统的合成方法,尤其是对称结构的3,3'-二吲哚甲烷类化合物的合成主要在化学量的Br?nsted酸或Lewis酸存在下,吲哚衍生物与羰基化合物经傅-克反应缩合得到.而过渡金属的使用可引起化合物中金属残留以及环境污染.总结和探讨了从2010年至今3,3'-二吲哚甲烷类化合物的合成方法,尤其是对无过渡金属参与条件下,对称结构的3,3'-二吲哚甲烷类化合物以及非对称结构3,3'-二吲哚甲烷类化合物制备的最新进展以及相应的反应机理,旨在为该类化合物生物活性测试提供重要的理论依据和技术支持. 相似文献
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《有机化学》2017,(5)
报道了由芳香醛合成4,4',6,6'-取代-2,2'-联吡啶化合物的方法,合成了一系列钠穴状化合物以及两个铕穴状化合物[Eu?bpy·bpy·bpy]·2Cl·Br(bpy=6,6'-二亚甲基-2,2'-联吡啶-4,4'-二甲酯)(23)和[Eu?bpy~1·bpy~1·bpy~2]·2Cl·Br(bpy~1=6,6'-二亚甲基-2,2'-联吡啶-4,4'-二甲酸,bpy~2=6,6'-二亚甲基-2,2'-联吡啶-4,4'-二甲酰乙二胺)(24).目标化合物均经过~1H NMR、13C NMR和高分辨质谱(HRMS)表征.X射线单晶衍射(XRD)和HRMS鉴定了铕穴状化合物23的结构.对23的荧光光谱(PL)、荧光衰减曲线和绝对量子产率(η)的研究结果表明,23能够有效地被近紫外光激发,显示荧光寿命(τ)为0.32 ms,η为70%的亮红色荧光,表明23是一种在发光和照明显示之中有着潜在应用的荧光材料. 相似文献
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荧光增白剂4,4''-双(4-磺酸钠苯乙烯基)联苯新的合成方法 总被引:1,自引:1,他引:0
论述了荧光增白剂4,4'-双(4-磺酸钠苯乙烯基)联苯的合成方法,选择Heck反应作为合成的基本反应.通过研究影响该反应的各种因素,优化实验条件,确定了最佳实验条件为:壳聚糖负载钯为催化剂,用N-甲基吡咯烷酮(NMP)作为溶剂,温度控制在120 ℃,对碘代联苯与对乙烯基苯磺酸钠的比例为1∶3.5,反应25 h,产率达到56.30 %,同时采用红外光谱和质谱对产物进行了表征.并对催化剂进行了回收再利用,为此类产品的绿色工业化生产提供了实验基础. 相似文献
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Trans-1,2-bis(2'-(5 '-phenyl-1 ',3',4'-oxadiazolyl)) cyclopropane (BDCP) and its eleven substituted novel derivatives were synthesized. Besides four derivatives of l,2-bis(2'-(5'-phenyl-l ' , 3 ' , 4 ' -ox-adiazo1yl))ethane (BPDS) were also synthesized as model compounds. The crystal structure of ethyl BDCP was determined and the cyclopropane ring was found to be able to transmit conjugation between the aromatic groups directly bonding with it by studying the ultraviolet and fluorescent spectra of the above compounds. 相似文献
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合成了16种2,2-二苯并(口恶)唑衍生物,测定了化合物的熔点、红外光谱、紫外吸收光谱、荧光发射光谱以及荧光量子产率,与1,4-二(苯并(口恶)唑1′,3′-基-2′)苯和1,4-二(苯并(口恶)唑-1′,3′-基-2′)乙烯衍生物进行了比较,讨论了它们之间光谱特性的差异. 相似文献
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A series of bisthienylethenes containing imidazole and imidazolium derivatives have been prepared and the products have been characterized by means of NMR and MS.Their photochromic and fluorescent switch properties have been investigated by UV–vis absorption spectra and fluorescence spectra.The fluorescent emissions of these kinds of photochromic compounds can be simply modulated by varying the imidazole groups,which shows that these compounds may have potential application in the design of fluorescent photochromic materials. 相似文献
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《Liquid crystals》1999,26(12):1841-1843
Triphenylene derivatives with six peripheral chains can make excellent discotic liquid crystals showing great promise in electronic devices. Vanadium oxytrichloride was found to be a novel reagent for the preparation of various triphenylene derivatives. Symmetrically substituted hexaalkoxytriphenylenes were obtained from o-dialkoxybenzenes by oxidative trimerization with VOCl3 in high yields. Oxidative coupling of a 3,3',4,4'-tetraalkoxybiphenyl with 1,2-dialkoxybenzenes yielded unsymmetrically substituted derivatives of triphenylene; a direct coupling of a 3,3',4,4'-tetraalkoxybiphenyl with alkoxyphenol produced monofunctionalized triphenylenes. 相似文献
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通过A2+B3反应制备超支化聚芳醚酮荧光材料 总被引:5,自引:0,他引:5
用3-二甲氨基苯酚与超支化聚芳醚酮(HPETFDEK-F)的末端氟发生反应,制得荧光超支化聚芳醚酮(FHPETFDEK).采用1HNMR,FTIR,DSC和TGA等方法对所得到的聚合物结构和热性能进行了表征.研究了FHPETFDEK的紫外吸收及荧光发射光谱,发现其具有荧光行为. 相似文献
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本文合成了对-(2-苯基-1,3,4,-噁二唑基-5)-(5’-苯基噁唑基-2’)苯和对-(2-苯基-1,3,4-噁二唑基-5)-(2’-苯基q罨唑基-5’)苯二类共12种化合物,测试了它们的紫外、荧光、红外光谱和激光转换效率. 相似文献
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Synthesis and Characterization of New Xanthene Derivatives,and Their Electrochemical Study 下载免费PDF全文
This work investigated the synthesis of biphenyl‐3,3′,4,4′‐tetracarboxylic dianhydride and benzophenone‐3,3′,4,4′‐tetracarboxylic dianhydride derivatives ( 3a – e and 6a – e ) with different substituted phenols via Friedel‐Crafts acylation reaction in the presence of dilute sulfuric acid. Dianhydride derivatives with 3‐N,N′‐dimethylamino phenol ( 3d and 6d ) and resorcinol ( 3e and 6e ) have been found to be highly fluorescent. The structures of all newly synthesized compounds were confirmed by the chromatographic, spectral and elemental data. Electrochemical study was done to determine to band gap energy, LUMO and HOMO levels energy. Band gap and LUMO energy levels were found to be lowest in xanthene derivatives substituted with 3‐N,N′‐dimethylamino group having value 2.24 and 4.85 eV respectively. 相似文献
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SHI Xiu-min WANG Hai-yan LI Yan-bing YANG Jing-xiu CHEN Lei HUI Ge XU Wei-qing ZHAO Bing 《高等学校化学研究》2010,26(6):1011-1015
Fourier-transform infrared(FTIR),Raman and ultraviolet-visible spectra of 4,4'-bipyridine and its me-tal-organic coordination compounds synthesized from 4,4'-bipyridine and nitrate of Co(Ⅱ),Ni(Ⅱ) and Zn(Ⅱ) were measured and analyzed,respectively.The main FTIR and Raman bands were assigned in detail.The relationship between these characteristic bands and the structure of ligands and coordination compounds were discussed. 相似文献