1: para-methylacetophenone With sodium t-butanolate in tetrahydrofuran T=20°C; 0.333333 h; 2: With 2,2'-bis-(diphenylphosphino)-1,1'- binaphthyl; tris(dibenzylideneacetone)dipalladium(0) chloroform complex in tetrahydrofuran 0.166667 h; 3: 3-chloro-6-methoxy-pyridazine in tetrahydrofuran T=75°C; 1 h;