tetrakis(triphenylphosphine) palladium(0) in 1,4-dioxane 3 h; Heating;

2,6-di-tert-butyl-4-methyl-phenol; tris-(o-tolyl)phosphine; lithium chloride; bis-triphenylphosphine-palladium(II) chloride; copper(I) bromide in N,N-dimethyl-formamide Heating;