1: 1-iodo-2-(trifluoromethyl)benzene With copper; zinc in N,N-dimethyl-formamide T=80°C; 0.0333333 h; 2: 4-bromo-benzaldehyde With bis-triphenylphosphine-palladium(II) chloride in N,N-dimethyl-formamide T=120°C; Negishi cross-coupling reaction; 0.0833333 h; Further stages.;