共查询到19条相似文献,搜索用时 78 毫秒
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本文综述了有机高价碘化合物在合成中应用的进展, 介绍了有机高价碘化合物的制备, 阐述了有机高价碘化合物作为芳基, 烷基, 烯基, 炔基, 转移剂及芳基碘盐应用于复杂化合物的合成。 相似文献
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合成了一种带芳基的硫脲盐类化合物,对其在光照下的光化学和光物理行为进行了较详细的研究.发现该化合物在光照下,能通过光诱导的分子内电子转移,产生离子自由基和自由基,继而有可能经自由基的重合反应形成环状化合物,并引起所含芳基基团处于合适的易于出现很强激基缔合物的位置.为进一步搞清上述反应机制,工作中设计了相应的实验,包括:ESR的测定、加入稳定的氮氧自由基化合物以及加入β-CD来阻抑重合反应的进行等,以证明上述的看法. 相似文献
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含溴橙光化合物与双(三环己基膦)钯(0)进行氧化加成反应,合成了相应的芳基钯(Ⅱ)配合物.在加热条件下,该配合物可以引发AB型芴单体聚合,得到端基为橙光芳基基团的聚芴共轭聚合物.含溴橙光化合物与不同配体钯(0)配合物组成催化体系,原位引发聚合,同样可以制备上述端基结构明确的共轭聚合物.其中,以三(邻甲基苯基)膦或卡宾化合物为辅助配体时,室温下即可引发AB型芴单体进行催化剂转移聚合.卡宾化合物为辅助配体时,可以获得Mn为7.48×10~4的高分子量聚芴.MALDI-TOF分析证实,聚合物的一个端基是来自催化剂钯配合物中的橙光芳基基团,另一端基为Br/H原子.聚合物光致发光(PL)光谱主要表现为聚芴单元的蓝色荧光发射.电致发光(EL)光谱表明,聚合物在低分子量时表现为橙红光发射,而在高分子量时,能够得到白光发射.在数均分子量Mn为7.48×10~4时,聚合物可实现纯白光发射,国际色坐标CIE为(0.31,0.32). 相似文献
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本文以低交联度的氯甲基化苯乙烯-二乙烯基苯共聚物与辛可宁,奎宁生物碱反应,合成了具有手性中心的相转移催化剂,并用它来诱导催化0-乙基硫代膦酰二氯与取代酚 的不对称缩合反应,合成了0-乙基,0-取代芳基硫代膦酰氯,为不对称合成有机硫代膦酰胺类化合物提供了一种新的方法,进行了一次有益的尝试。 相似文献
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Coleen Pugh Virgil Percec 《Journal of polymer science. Part A, Polymer chemistry》1990,28(5):1101-1126
Several 1,2-(4,4'-dialkoxyaryl)acetylene monomers containing similar or dissimilar substituents were prepared by one of three variations of a one pot phase transfer Pd(O)/Cu(I) catalyzed coupling of aryl halides with a protected acetylene. The three steps within a single flask involved first coupling of the appropriate 1-halo-4-alkoxybenzene derivative with 2-methyl-3-butyn-2-ol, followed by cleavage of the carbinol group to form an aryl acetylide, and finally a second coupling of an aryl halide with the aryl acetylide. Best results were obtained when elevated temperatures and solid-liquid phase transfer reaction conditions were used. Some 1,4-bis[2-(4',4”-dialkoxyphenyl)ethynyl]benzene compounds were also prepared. 相似文献
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Haaf K 《Combinatorial chemistry & high throughput screening》2005,8(7):637-641
In order to gain a broad access to phosphinic acid derivatives, a palladium catalysed coupling reaction of aryl iodides with hypophosphorous acid derivatives has been developed on the solid phase. The resulting arylphosphorous acids (or esters) were derivatised using addition reactions with aldehydes, imines and isocyanates, to give phosphinic acids (or esters) with alpha-hydroxy, alpha-amino or aminoacyl groups attached to the aryl phosphorus moiety. This approach provided a broad chemical entry into a class of polar phosphinates compounds which were rather difficult to handle using normal solution phase synthesis. The synthetic potential of this solid phase based methodology was demonstrated by the synthesis of targeted libraries against the enzyme dihydrodipicolinate synthase (DHDPS). 相似文献
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相转移催化法合成芳氧基乙酸芳酯及硫赶酸苯酯 总被引:5,自引:0,他引:5
用液-液相转移催化法合成了35个芳氧基乙酸芳酯,5个芳氧基硫赶乙酸苯酯,与经典方法相比,相转移催化法有产率较高,反应条件温和,操作简便等优点。 相似文献
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Agafonov N. E. Dudin A. V. Preobrazhenskii A. A. Zhulin V. M. 《Russian Chemical Bulletin》2001,50(3):560-562
The reactions of aromatic aldehydes with tryptamine (1) in solvents of different polarity were studied. The yields of carbolines in the chosen media decrease with an increase in the donating properties of the aryl substituent, but they markedly increase at a high pressure (5 kbar), especially for compounds with electron-donating aryl groups. The phase transition of dioxane at 5 kbar also sharply increases the yields of the target products. 相似文献
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Toshio Itahara 《Liquid crystals》2013,40(7):1034-1041
Liquid crystalline properties of five series of biphenyl derivatives connected with p-nitrophenyl, phenyl, 2-naphthyl, 9-phenathryl and bromo as the terminal groups via flexible spacers were studied. All the compounds exhibited nematic phase. The nematic–isotropic or isotropic–nematic transition properties resulted in an odd–even effect as the length of the spacers was varied, in which the even members exhibited higher values, for the compounds with p-nitrophenyl, phenyl, 2-naphthyl and 9-phenanthryl groups, while the transitional properties of the compounds substituted with bromo atom as the terminal group instead of the aryl groups did not show such odd–even effect. These results suggest that the aryl rings, such as p-nitrophenyl, phenyl, 2-naphthyl and 9-phenanthryl groups, play a role of mesogen while the terminal bromo atom does not. The effect of the terminal aryl rings on the liquid crystalline properties will be reported. 相似文献
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Cai-lan Wang Yu-lu Wang Xiao-yang Wang Jian-ping Li Dong-lan Ma Hong Wang 《合成通讯》2013,43(21):3723-3728
Using potassium chlorate, sulfuric acid and ferrous sulfate as a catalytic oxidation system to oxidize the aryl substituted semicarbazide to prepare azo compounds in one phase have been described first time in this paper. Fourteen azo compounds have been synthesized in excellent yields(>90%). This method only needs cheap reagents, simple instrument and short reaction time. A possible mechanism has been suggested. 相似文献
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报道了合成S-烷基S-烷基(芳基)二硫代磷酸衍生物的一种便利的新方法。O,O-二烷基S-烷基(芳基)二硫代磷酸酯与三氯氧磷发生氯化反应的同时,伴随着P=S键异构成P-S键,生成S-烷基S-烷基(芳基)二硫代磷酰氯,在碱存在下进一步与各种亲核试剂反应,得到S-烷基S-烷基(芳基)二硫代磷酸衍生物。 相似文献
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N. M. Chistovalova I. S. Akhrem V. F. Sizoi V. V. Bardin M. E. Vol'pin 《Russian Chemical Bulletin》1988,37(5):1039-1042
Conclusions The regioselective arylation of unsaturated compounds was carried out under metal complex and phase transfer conditions by the action of aryl iodides.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 1180–1183, May, 1988. 相似文献