排序方式: 共有33条查询结果,搜索用时 109 毫秒
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《Journal of Saudi Chemical Society》2014,18(5):502-506
A one-pot, three-component condensation reaction of 2-aminobenzothiazole, 2-naphthol and appropriate aldehydes catalyzed by heteropolyacid (HPA) in an aqueous medium afforded the Mannich adduct 2′-aminobenzothiazolomethylnaphthols at 45 °C under ultrasound irradiation. This method provides several advantages such as simple work-up procedure, short reaction time and high yields. 相似文献
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SiO2与Keggin杂多酸相互作用的研究 总被引:9,自引:0,他引:9
采用经典酸化与乙醚萃取相结合的方法,制备了Keggin型杂多酸H3PMo12O40,并以SiO2为载体制备了经不同温度焙烧的负载型杂多酸样品,利用TG、DTA、IR、XPS、NH3-TPD等手段,对负载前后的杂多酸样品进行了表征;考察了SiO2与杂多酸之间的相互作用以及载体对杂多酸酸性的影响,研究发现,SiO2载体的引入,可以有效改善杂多酸的热稳定性,焙烧温度的升高,会显著降低杂多酸的酸性,并提出SiO2杂多酸的相互作用方式。 相似文献
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Majid M. Heravi Samaheh Sadjadi Sodeh Sadjadi Hossein A. Oskooie Rahim Hekmat Shoar Fatemeh F. Bamoharram 《中国化学会会志》2009,56(2):246-250
Silica‐supported Preyssler nanoparticles (H14[NaP5W30O110])/SiO2 are used as a new and recyclable catalyst for the preparation of 1,3‐diaryl‐5‐spirohexahydropyrimidines via a one‐pot condensation of anilines, formaldehyde, and cyclohexanone. 相似文献
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<正>4,6-Diarylpyrimidin-2(1H)-one derivatives have been synthesized from three-component one-pot condensation of acetophe-none derivatives,aldehydes and urea in the presence of trimethylsilyl chloride and a catalytic amount of H_3PMo_(12)O_(40)under solvent-free conditions. 相似文献
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Oxidative deprotection of a variety of trimethylsilyl ethers were performed by Fe(NO3)3.9H2O in the presence of H3PMo12O40.xH2O as catalyst at room temperature in good to high yields under solvent‐free conditions. 相似文献
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Heteropoly complexes K11[Ln(CaW 11O39H2)21 · x H2O(Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy ) have been prepared and analysed. Some properties such as thermal behavior, IK and UV spectra, X-ray powder diffraction, magnetic susceptibility and X-ray photoelectron spectrum have been investigated. 相似文献
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铁—杂多酸液流电池的研究 总被引:2,自引:0,他引:2
本文报道的氧化还原流动池、负极活性物质为FeSO4,正极为H3PMo12O40(HP),具有选择性的阳离子交换膜将两个经活化的多孔碳毯电极分开,两个氧化还原电对在碳和石墨电极上都具有相适应的电化学可逆性。电池的活性性质很稳定,电池没有使用寿命限制。 相似文献
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《Comptes Rendus Chimie》2015,18(5):558-563
In this paper, the reaction of indole with electron-deficient alkenes in aqueous media is reported. This procedure allows the synthesis of bis(indole) derivatives in good to high yields at 90 °C under silent and ultrasound irradiation conditions. Short reaction times and high yields of desired products are the main advantages of the presented procedure. This reaction catalyzed by 12-tungstophosphoric acid is operationally simple and considers environmental aspects by avoiding toxic catalysts and solvents. 相似文献
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Majid M. Heravi Sodeh Sadjadi Rahim Hekmatshoar Hossein A. Oskooie Fatemeh F. Bamoharram 《Monatshefte für Chemie / Chemical Monthly》2008,139(2):107-110
Summary. Some N-aminotriazines and -triazoles were treated with Preyssler’s anion as catalyst in acetic acid to afford the corresponding deaminated triazines and triazoles. The reaction is suggested
to proceed via formation of N-nitrosamines with subsequent N–NO bond cleavage. 相似文献