1: anhydrous trifluoroacetaldehyde With sodium hydrogencarbonate; magnesium sulfate in tert-butyl methyl ether; water T=10°C; 0.166667 h; 2: 4,4,4-trifluoro-2-(triphenyl-λ5-phosphanylidene)butyric acid ethyl ester With magnesium sulfate in tert-butyl methyl ether; water T=70 - 75°C; P=930.891 - 1086.04 Torr; 15 h;