1: With tetrakis(triphenylphosphine) palladium(0); copper(I) thiophene-2-carboxylate; [Ph2PO2]1-*[NBu4]1+ in N,N-dimethyl-formamide T=25°C; Stille Cross Coupling; Inert atmosphere; 2: With 2,6-di-tert-butyl-4-methyl-phenol in diethyl ether; N,N-dimethyl-formamide; toluene T=25°C; Inert atmosphere;