catalyst: Ni(COD)2-Ph2P(CH2)3PPh2 in toluene alkynylstannane and 1,2-diene (molar ratio 1:3) reacted in toluene in presence of Ni complex (0.05 equiv.) and phosphine (0.05 equiv.) at 50°C for 60 h; detd. by (119)Sn NMR spectra; PhC2CMe2C(CH2)SnMe3 and PhC2CH2C(SnMe3)CMe2 (96:4) obtained, total yield 37percent;