1: 1-cyclohexenylacetylene With n-butyllithium in tetrahydrofuran; hexane T=-78 - 0°C; 1 h; 2: oxirane With trimethylaluminum in tetrahydrofuran; hexane T=20°C; 24 h;

piperidine; tetrakis(triphenylphosphine) palladium(0) T=25°C; 0.0833333 h;