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- W2015760260 abstract "Abstract The RuCl2(PPh3)3 and RuCl3(AsPh3)2·CH3OH complex catalysts were studied for the double bond isomerization of methyl chavicol and eugenol in the polar aprotic (DMSO, acetonitrile), polar protic (ethanol, methanol, n-propanol, iso-propanol, n-butanol, iso-butanol, n-hexanol) and non-polar (benzene, toluene, n-hexane, cyclohexane, tetrahydrofuran) solvents. The highest conversion of methyl chavicol (99.7%) with 95.4% selectivity of trans-anethole was observed in ethanol using RuCl2(PPh3)3 catalyst. However, 94.2% conversion of methyl chavicol with 98.6% selectivity of trans-isomer was observed using methanol as a solvent in RuCl3(AsPh3)2·CH3OH. The kinetics of isomerization of methyl chavicol and eugenol using RuCl2(PPh3)3 and RuCl3(AsPh3)2·CH3OH catalysts in ethanol or methanol involving the effect of substrate concentrations, catalyst amount, solvents and temperature on the initial rate of reaction was studied in details. The initial rates of reaction were observed to increase on increasing the initial concentrations of methyl chavicol, eugenol and catalysts. However, the initial rate of reaction decreased on increasing the solvent concentration. Activation energies for the isomerization of methyl chavicol were calculated using RuCl2(PPh3)3 and RuCl3(AsPh3)2·CH3OH catalysts and were found to be 4.3 and 6.0 kJ/mol, respectively. Activation energy for the isomerization of eugenol was found to be 6.9 kJ/mol using RuCl2(PPh3)3 complex catalyst. The RuCl2(PPh3)3 complex was recycled five times for the isomerization of methyl chavicol and eugenol." @default.
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- W2015760260 date "2006-02-01" @default.
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- W2015760260 title "Selective double bond isomerization of allyl phenyl ethers catalyzed by ruthenium metal complexes" @default.
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- W2015760260 doi "https://doi.org/10.1016/j.molcata.2005.10.005" @default.
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