共查询到20条相似文献,搜索用时 15 毫秒
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S. N. Mikhailichenko A. A. Chesnyuk L. D. Konyushkin S. I. Firgang V. N. Zaplishny 《Chemistry of Heterocyclic Compounds》2006,42(5):642-647
The routes of base and acid hydrolysis of sym-triazine mononitriles has been studied for aqueous or aqueous-alcohol media.
Depending on the pH of the medium, the concentration of reagents, and the temperature it was found that the hydrolysis led
to the formation of amides, oxo or alkoxy 1,3,5-triazines, or to an unstable sym-triazine carboxylic acid, the latter leading
to formation of substituted sym-triazines. A novel series of tetrazolyltriazines has been prepared by the reaction of the
mononitriles with sodium azide and their alkylation has been studied.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 731–737, May, 2006. 相似文献
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V. V. Korshak T. M. Frunze A. A. Izyneev V. G. Samsonova 《Russian Chemical Bulletin》1972,21(9):2045-2046
Conclusions A study was made of the cyclotrimerization of benzonitrile in chlorosulfonic acid and the optimum conditions were ascertained for the formation of 2,4,6-triphenyl-1,3,5-triazine.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2105, September, 1972. 相似文献
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2-氯-4,6-二苯氨基-1,3,5-三嗪改性纤维素的制备、结晶结构与水解性能 总被引:1,自引:0,他引:1
目前, 纤维素水解产生可发酵糖的效率很低, 是纤维素-乙醇转化的瓶颈问题. 拟以化学改性的方法改变纤维素结晶结构从而提高其水解效率. 首先以三聚氰氯(TCT)、苯胺为原料, 合成2-氯-4,6-二苯氨基-1,3,5-三嗪(DACT), 通过红外光谱、核磁共振谱图表征其结构. 将DACT用于微晶纤维素羟基的修饰, 并将修饰后的纤维素于50 ℃、固液比为1∶20 (W/V)比为条件下用70 wt%硫酸水解60 min, 研究DACT用量对纤维素结晶结构和水解性能的影响. 水解实验结果表明DACT的相对物质的量的百分含量(以葡萄糖环计)为30%左右时, 改性纤维素经酸催化水解后还原糖得率最高, 广角X射线衍射证实该水解结果可归因于化学改性令纤维素的结晶结构发生变化, 利于纤维素水解产生可发酵糖. 相似文献
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V. I. Kelarev R. A. Karakhanov Yu. N. Polivin A. S. Remizov 《Chemistry of Heterocyclic Compounds》1992,28(12):1357-1373
Data on methods for the synthesis of 1,3,5-triazine derivatives by cyclotrimerization and cyclocondensation reactions with the participation of carboxylic acid imino esters are systematized in the review.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No.12, pp. 1587–1605, December 1992. 相似文献
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M. Becker M. Jansen 《Acta Crystallographica. Section C, Structural Chemistry》1999,55(8):IUC9900094-IUC9900094
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F. Cataldo O. Ursini G. Angelini 《Journal of Radioanalytical and Nuclear Chemistry》2008,277(2):297-302
Triazines are a class of molecules which have been found in meteorites such as Orgueil meteorite. Despite their poor resistance
to UV radiation, these molecules survived millions of years inside a meteorite. The present work is dedicated to the examination
of the radiation resistance of the simplest sym-triazine: 1,3,5-triazine. The crystals of this molecule have been irradiated
with γ-radiation at 50 and 350 kGy and were studied by electronic absorption spectroscopy, liquid chromatography, FT-IR spectroscopy
and differential scanning calorimetry (DSC). All the data suggest the relatively low stability of this molecule to high energy
radiation. The resulting products from radiolysis are formamidine together with triazine dimers and oligomers. Other radiolysis
products are H2, CH4, HCN and other gases. 相似文献
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With the extensive investigation of the Michael reaction, not the methylene compounds activated by electron withdrawing group[1,2] but other activated unsaturated compounds containing such as activate N-H or O-H have been used as Michael acceptor.[3,4] However, the research on the Michael reaction of 2,4-dioxohexahydro-1,3,5-triazine (DHT) has not been reported. After the systematic researches on the substitution reactions of DHT, we first report the Michael reaction of DHT with acrylic esters in this paper. 相似文献
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A. M. Al-Sabagh N. G. Kandile N. M. Nasser M. R. Mishrif 《Journal of Dispersion Science and Technology》2014,35(10):1361-1368
This study mainly concentrates on the synthesis of three novel demulsifiers and the investigation of their demulsification efficiency. The demulsifiers were derived from 1,3,5-triethanolhexahydro-1,3,5-triazine, which was prepared by the reaction of monoethanol amine with formaldehyde. The 1,3,5-triethanolhexahydro-1,3,5-triazine was ethoxylated by introducing 20 units of ethylene oxide and then esterified at different molar ratios with oleic acid (1, 2, and 3) to give three demulsifiers, namely, E20TO, E20TO2, and E20TO3. The chemical structures of the prepared demulsifiers were confirmed by 1H NMR and FTIR spectrum. The demulsification efficiency of these demulsifiers was tested on the natural water-in-oil (w/o) emulsions (50% water content). From the obtained results, it has been found that the investigated demulsifiers have a great potential to break the w/o emulsions. The trioleat ester (E20TO3) exhibited the maximum demulsification efficiency (96%) after 120 minutes at 55°C. 相似文献
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High-pressure vibrational spectroscopy of energetic materials: hexahydro-1,3,5-trinitro-1,3,5-triazine 总被引:1,自引:0,他引:1
Vibrational spectroscopy has been used to investigate the room-temperature high-pressure phases of the energetic material hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX). The pressure-induced alterations in the spectral profiles were studied in a compression sequence to 30.2 GPa using Raman spectroscopy and to 26.6 GPa using far-infrared spectroscopy. At pressures near 4.0 GPa, several changes become immediately apparent in the Raman spectrum, such as large frequency shifts, mode splittings, and intensity changes, which are associated with a phase transition from alpha-RDX to gamma-RDX. Our study extends the kinetic stability of gamma-RDX to pressures near 18.0 GPa. Evidence for a new phase was found at pressures between 17.8 and 18.8 GPa and is based on the appearance of new vibrational bands and associated changes in intensity patterns. The new phase has vibrational characteristics that are similar to those of beta-RDX, suggesting the two polymorphs share a related crystal structure. 相似文献
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Conclusions Methods have been developed for the preparation of the simplest fluorine-containing phenyltriazine, viz., 2-trifluororaethyl-4,6-diphenyl-1,3,5-triazine, in virtually quantitative yield.Translated from Izvestiva Akademii Nauk SSSR, Seriya Khimieheskaya, No. 4, pp. 919–920, April, 1986. 相似文献
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Madhukar S. Chande Rajgopal N. Dravid Nandita P. Shetgiri 《Journal of Chemical Sciences》1988,100(1):53-58
Interaction of ethyl chloroformate with γ-N-substituted trithioallophanic acids has been found to yield the corresponding
6-oxo-5-aryl-2,4-dithio-hexahydro-l,3,5-thiadiazines. These on reaction with amines yield 1,3,5-triazines. γ-N-substituted
β-oxo-dithio-allophanic acid with ethyl chloroformate similarly yields 4,6-dioxo-5-aryl-2-thio-1,3,5-thiadiazine. Antimicrobial
activity of thiadiazines has been reported. 相似文献