Different products in the reaction of the alcohols with cyclic and acyclic 1,3-dicarbonyl compounds:K5CoW12O40 as an electron transfer nano catalyst

K₅CoW₁₂O₄₀ was used as a highly effective catalyst for the benzylation of 1, 3-dicarbonyl compounds. β-Keto enol ethers were obtained when cyclic 1, 3–dicarbonyl compounds used in this conditions instead of linear ones. The present methodology offers a practical, simple, mild, environmentally friendly, and time-saving method for etherification. Very low loading of catalyst, ease of workup, ease of handling, and reusability of catalyst are other advantages of this catalyst.