for the following products
Ethyl 2-(ethoxymethylene)-4,4,4-trifluoro-3-oxobutyrate, (cis+trans) | Ethyl 2-(ethoxymethylene)-4,4,4-trifluoroacetoacetate | Ethyl 3-ethoxy-2-(2,2,2-trifluoroacetyl)acrylate and Ethyl ethoxymethylene-3-oxo-4,4,4-trifluorobutyrate
