1: methyl ethylphenylphosphonoacetate With 18-crown-6 ether; potassium hexamethylsilazane in tetrahydrofuran; toluene T=-78°C; Horner-Wadsworth-Emmons reaction; 1 h; 2: benzaldehyde in tetrahydrofuran; toluene T=-78°C; 18 h; Title compound not separated from byproducts;

1: methyl ethylphenylphosphonoacetate With 18-crown-6 ether; potassium hexamethylsilazane in tetrahydrofuran; toluene T=-78°C; Horner-Wadsworth-Emmons reaction; 1 h; 2: benzaldehyde in tetrahydrofuran; toluene T=-78°C; 18 h; Title compound not separated from byproducts;