共查询到20条相似文献,搜索用时 15 毫秒
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超临界二氧化碳介质中有机化学反应研究 总被引:3,自引:0,他引:3
综述了本研究小组近年来在超临界二氧化碳介质中过渡金属催化的有机化学反应的研究结果,主要包括烯烃和炔烃的羰基化反应、氧化反应、自由基反应、低聚反应。 相似文献
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Mats Berglund Carlaxel Andersson Ragnar Larsson 《Journal of organometallic chemistry》1985,292(3):c15-c17
WCl6 has been used as a catalyst for the metathesis of various alkenylsilanes and the degree of conversion found to be dependent on the distance between the olefinic bond and the silyl group. The first observation of metathetical conversion of allyltrimethylsilane in the absence of a co-catalyst is reported 相似文献
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V. N. Khrustalev L. N. Nikitin A. Yu. Vasil’kov A. R. Khokhlov 《Russian Chemical Bulletin》2006,55(3):576-578
An organometallic compound, monoacetylferrocene, was for the first time obtained as single crystals by crystallization from
supercritical carbon dioxide. This offers the possibility of utilizing supercritical media for efficient crystallization and
purification of organometallic compounds without using organic solvents.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 555–557, March, 2006. 相似文献
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This tutorial review covers the use of ionic liquids as (co)solvents for the olefin metathesis reaction. Olefin metathesis is a simple and effective synthetic tool used to create many compounds which otherwise would require complex multistep syntheses. It is expected that the application of ionic liquids (IL) as well as the development of IL-enabled catalysts and separation techniques will create a green aspect to this important methodology. 相似文献
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《Journal of organometallic chemistry》2006,691(24-25):5148-5154
Alkene metathesis processes on nanostructures can proceed via radial or lateral pathways. Radial metathesis installs new functionalities on the surface of a nanostructure through outward growth from its core. Lateral metathesis involves successive crosslinking of neighboring alkenes on the nanostructure and creates a polymer shell around the particle. 相似文献
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Samsonov MD Wai CM Lee SC Kulyako Y Smart NG 《Chemical communications (Cambridge, England)》2001,(18):1868-1869
Uranium dioxide can be dissolved in supercritical CO2 with a CO2-philic TBP-HNO3 complexant to form a highly soluble UO2(NO3)(2).2TBP complex; this new method of dissolving UO2 that requires no water or organic solvent may have important applications for reprocessing of spent nuclear fuels and for treatment of nuclear wastes. 相似文献
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Wang J Khlobystov AN Wang W Howdle SM Poliakoff M 《Chemical communications (Cambridge, England)》2006,(15):1670-1672
A facile and efficient method has been developed for coating MWNTs with solvent resistant polymer in scCO2, which permits the selective deposition of high molecular weight fluorinated graft poly(methyl vinyl ether-alt-maleic anhydride) polymer onto MWNTs in scCO2 under 100-170 bar at 40 degrees C and forms quasi one-dimensional nanostructures with conducting cores and insulating surfaces. 相似文献
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Lee CK Holmes AB Al-Duri B Leeke GA Santos RC Seville JP 《Chemical communications (Cambridge, England)》2004,(22):2622-2623
The regioselectivity of dipolar cycloadditions of mesitonitrile oxide to various dipolarophiles in supercritical carbon dioxide can be tuned by changes in density, the magnesium bromide-mediated cycloaddition to pent-1-en-3-ol proceeding with higher stereoselectivity than in most conventional solvents. 相似文献
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Early TR Gordon RS Carroll MA Holmes AB Shute RE McConvey IF 《Chemical communications (Cambridge, England)》2001,(19):1966-1967
Heck and Suzuki reactions proceed in good yield in supercritical carbon dioxide in the presence of palladium acetate and tri-tert-butylphosphine with both free and polymer-tethered substrates. 相似文献
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A single step seed dispersion polymerisation is reported for the first time, in which scCO2 is used simultaneously as both an antisolvent and a polymerisation medium to create polymer-C60 composite microparticles providing additional proof for the mechanism of dispersion polymerisation in scCO2. 相似文献
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Supercritical carbon dioxide has been considered an appropriate alternative for extraction and purification process of cosmetics, pharmaceuticals, food supplements and natural products. Solubility information of biological compounds is essential for choosing supercritical fluid (SCF) processes. The solubility of iodopropynyl butylcarbamate (IPBC), a fungicide and anti-dandruff agent, was measured in supercritical carbon dioxide with a high pressure apparatus equipped with a variable volume view cell at 313.15, 323.15, and 333.15 K and at pressure between 80 and 35 MPa. The experimental data were correlated well with Peng–Robinson equation of state (PR EOS) and quasi-chemical nonrandom lattice fluid model. 相似文献
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《Fluid Phase Equilibria》1998,152(2):299-305
The equilibrium solubilities of dihydroxybenzene isomers pyrocatechol, resorcinol and hydroquinone have been measured in supercritical carbon dioxide using a simple static method. The measurements were performed in the pressure range from 120 to 400 atm at temperatures 35, 45, 55 and 65°C for pyrocatechol and resorcinol and in the pressure range from 120 to 200 atm at temperature 35°C for hydroquinone. The solubility of the isomers in supercritical CO2 was found to vary in the order pyrocatechol>resorcinol≫hydroquinone. The experimental data were correlated by use of the density based model proposed by Chrastil. 相似文献
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Liquid phase hydrogenation of phenol over Pt/C catalysts was investigated under conventional conditions and supercritical carbon dioxide (scCO2). The equivalent ration of hydrogen to phenol shows a significant effect on the product selectivity. Hydrogenation of phenol in different solvents was also studied, the experimental results show that polarity of solvents influences the yield of cyclohexanone remarkably, scCO2 has the highest one. Catalytic hydrogenation of phenol in scCO2 or sub-scCO2 was emphatically researched. The result is that near the critical point of CO2 phenol has higher reaction activity than that of normal organic solvents, cyclohexanone has 47% in yield and 87% in selectivity. 相似文献