To further broaden the methods for the heterogeneous phase alkylation of CH acidic compounds, the dialkylation of diethylethoxycarbonylmethylphosphonate was studied in the presence of Cs2CO3 under microwave and solvent-free conditions. It was found that after repeating the alkylations by the addition of newer portions of the alkylating agent and the base on a few occasions, the dialkylation was quite