[Ru(COD)Cl2]n /CuCl2.2H2O/LiCl catalytic system was found highly active in ionic liquid medium for aldehyde olefination reaction in term of yield and selectivity. Aromatic aldehydes with more electron-donating groups on the phenyl ring gave higher yield than those with electron withdrawing groups. Reduced reaction time as well as 5 times recycling of catalytic system reflects the importance of this modified process.
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