A new simple and efficient synthesis of 5,5-(phenylmethylene)bis(2,2-butylidene-1,3-dioxane-4,6-dione) derivatives, based on aromatic aldehydes and 2,2-butylidene-1,3-dioxane-4,6-dione, via Tandem reaction of Knoevenagel condensation and Michael addition is described using water as solvent without catalyst. A variety of aromatic aldehydes were engaged in study and afforded respective products in high yields (63%~83%). The reaction has the advantages of mild conditions, simple operation and environmental friendliness.
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