N-ethyl-N,N-diisopropylamine in tetrahydrofuran T=50°C; 12 h;

1: With Bu4MgLi2 in tetrahydrofuran; hexane RefluxInert atmosphere; 2: With iodine in tetrahydrofuran; hexane 2 h; Inert atmosphereReflux;

1: With copper diacetate; potassium ethylxanthate in N,N-dimethyl-formamide T=80°C; Ullmann type reaction; 15 h; Inert atmosphere; 2: With hydrogenchloride in water; N,N-dimethyl-formamide T=20°C; 8 h; Inert atmosphere;

palladium diacetate; caesium carbonate; tris-(o-tolyl)phosphine; 2,2,2-trimethylacetic acid in 1-methyl-pyrrolidin-2-one T=140°C; 48 h; Schlenk technique;