1: ethylmethylketene 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; 41 h; Inert atmosphere; stereoselective reaction;

water; zinc(II) chloride in dichloromethane T=20 - 25°C; Yield given. Yields of byproduct given;