1: With 1,3-bis-(diphenylphosphino)propane; hypophosphorous acid; triethylamine; palladium diacetate in N,N-dimethyl-formamide T=85°C; 15 h; 2: With oxygen in N,N-dimethyl-formamide T=110°C; 22 h; Further stages.;

Diazotization.Behandeln der Diazonium-Salz-Loesung mit Kupfer(I)-chlorid und wss.Salzsaeure;

1: (i) NO2/HNO3, (ii) aq. NaOH, Na2S 2: (i) NaNO2, aq. HCl, (ii) CuCl, aq. HCl View Scheme