1: (E)-3-ethyliden-2,2-diisopropyl-1-oxa-2-silacyclopentane With tetrabutyl ammonium fluoride in tetrahydrofuran T=20°C; 0.166667 h; 2: para-iodobenzonitrile With bis(dibenzylideneacetone)-palladium(0) in tetrahydrofuran T=45°C; 15 h; Further stages.;