1: methyl ethyl(2,2,2-trifluoroethyl)phosphonoacetate With 18-crown-6 ether; 1,8-diazabicyclo[5.4.0]undec-7-ene; potassium iodide in N,N-dimethyl-formamide T=0°C; Horner-Wadsworth-Emmons reaction; 1 h; 2: benzaldehyde in N,N-dimethyl-formamide T=0°C; 18 h; Title compound not separated from byproducts;

1: methyl ethyl(2,2,2-trifluoroethyl)phosphonoacetate With 18-crown-6 ether; 1,8-diazabicyclo[5.4.0]undec-7-ene; potassium iodide in N,N-dimethyl-formamide T=0°C; Horner-Wadsworth-Emmons reaction; 1 h; 2: benzaldehyde in N,N-dimethyl-formamide T=0°C; 18 h; Title compound not separated from byproducts;