1: methylphenylketene methyl trimethylsilyl acetal; phenylacetylene With gallium(III) bromide in dichloromethane T=20°C; 2 h; Inert atmosphere; 2: iodobenzene With tris(dibenzylideneacetone)dipalladium(0) chloroform complex; sodium t-butanolate in dichloromethane; N,N-dimethyl-formamide T=100°C; 48 h; Inert atmosphere; stereoselective reaction;