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Supported H4SiW12O40 catalysts for α-pinene isomerization

100%
Szücs-Balázs J.-Z., Coroş M., Woiczechowski-Pop A., Blăniƫă G., Vlassa M.
Open Chemistry
|
2012
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vol. 10
|
issue 4
1208-1217
EN
The heterogeneous isomerization of α-pinene was studied at 100, 130 and 160°C using 10% supported H4SiW12O40 (SiW) on SiO2, TiO2 and HZSM-5. The effect of the reaction temperature and the concentration of the catalyst over the conversion of α-pinene and the selectivity of camphene, limonene and terpinolene had been monitored. The recovery, reuse and leaching effect of the catalysts were studied. Simple, environmentally friendly and economic methods for the synthesis of camphene and limonene were developed and optimized. [...]
2
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A comparative study concerning chromatographic retention and computed partition coefficients of some precursors of peraza crown ethers

86%
Onişor C., Blăniţă G., Coroş M., Bucşa M., Vlassa M., Sârbu C.
Open Chemistry
|
2010
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vol. 8
|
issue 6
1203-1209
EN
Retention indices for some precursors of peraza crown ethers were determined by reversed phase high-performance thin layer chromatography on RP-18 plates with methanol-water in different volume proportions as mobile phase. The Log P values for the same compounds were calculated using different computer programs: SciQSAR, SciLogP, Chem3D Ultra 8.0, XLOGP (based on atom contributions), Chemaxon and KOWWIN (based on atom/fragment contributions), cLogP (based on fragmental contributions), ALOGPS and IAlogP (based on atom-type electrotopological-state indices and neural network modeling). A comparative study concerning lipophilic parameters (RM0, b and ϕ0) and computed partition coefficients has been developed. Taking into account the correlation coefficients between determined and calculated Log P values, it seems that RM0 and b are less suitable than ϕ0 for estimating lipophilicity of the compounds investigated, and cLogP and ALOGPS provide the best correlations with experimental values.
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