1: bis(methoxymethoxymethyl)acetylene; 3-chloroprop-1-ene With tris(dibenzylideneacetone)dipalladium(0) chloroform complex; 1,1'-bis-(diphenylphosphino)ferrocene; cesium fluoride in tetrahydrofuran; acetonitrile T=20°C; carbopalladation; Cycloaddition; 0.0833333 h; 2: o-(trimethylsilyl)phenyl trifluoromethanesulfonate With cesium fluoride in tetrahydrofuran; acetonitrile T=60°C; 24 h;