1: 4-phenyl-3-butyn-2-one With boron trifluoride diethyl etherate in diethyl ether T=0°C; 0.05 h; Inert atmosphere; 2: 4-ethylidene-2,2,6,6-tetramethyl-3,5-dioxa-2,6-disilaheptane in diethyl ether T=0 - 20°C; 4 h; Inert atmosphere; Overall yield = 94 percent;

triethylamine; (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride T=120°C; P=15200 Torr; 43 h;