1: 1-bromopinacolone With triethylamine; triphenylphosphine in tetrahydrofuran 2 h; Reflux; 2: 2,2,2-Trifluoro-1-phenyl-ethanone in tetrahydrofuran; N,N-dimethyl-formamide T=20°C; 120 h; Reflux;

triethylamine in tetrahydrofuran; N,N-dimethyl-formamide T=80°C; Horner-Wadsworth-Emmons reaction; 2 h;