heating to 140°C;

tetrakis(triphenylphosphine) palladium(0) in 1,2-dichloro-ethane 100°C, 3 h, sealed glass ampul purged with argon; 0.5 M Me3SnCCBu-t, 1 M C3F7I, catalyst concn. 1 mol percent of the amount of Me3SnCCBu-t;

bis(benzonitrile)palladium(II) dichloride in acetonitrile 100°C, 3 h, sealed glass ampul purged with argon; 0.5 M Me3SnCCBu-t, 1 M C3F7I, catalyst concn. 1 mol percent of the amount of Me3SnCCBu-t;

tetrakis(triphenylphosphine) palladium(0) in 1,2-dichloro-ethane 100°C, 3 h, sealed glass ampul purged with argon; 0.5 M Me3SnCCBu-t, 1 M C3F7I, catalyst concn. 1 mol percent of the amount of Me3SnCCBu-t;

boron trifluoride diethyl etherate; difluoro[4-(trifluoromethyl)phenyl]-λ(3)-bromane in dichloromethane T=-78 - 20°C; 5 h;

tetrakis(triphenylphosphine) palladium(0) in 1,2-dichloro-ethane 100°C, 3 h, sealed glass ampul purged with argon; 0.5 M Me3SnCCBu-t, 1 M C3F7I, catalyst concn. 1 mol percent of the amount of Me3SnCCBu-t;

bis(benzonitrile)palladium(II) dichloride in acetonitrile 100°C, 3 h, sealed glass ampul purged with argon; 0.5 M Me3SnCCBu-t, 1 M C3F7I, catalyst concn. 1 mol percent of the amount of Me3SnCCBu-t;

in not given byproducts: (CH2CHCH2)2BCCC(CH3)3; (Ar), mixed at -78°C; not separated, detected by NMR;

catalyst: azobisisobutyronitrile in neat (no solvent) Irradiation (UV/VIS); equimolar amts. of alkyne and Me3SnH was irradiated with UV light (Hg high pressure lamp) under Ar in the presence of a catalytic amt. of AIBN for 11 h (IR and (1)H NMR monitoring); t-BuCH=C(SnMe3)2 to t-Bu(Me3Sn)C=CHSnMe3 ratio 98:2, total yield 34percent; the reaction mixt. was distilled under reduced pressure (b.p. 59°C/0.01 mm Hg); elem. anal. for the isomeric mixt., isomers were not sepd.;

in tetrahydrofuran with exclusion of air and moisture, 1 equiv. of Ph3B soln. in THF was added to Sn-compd. soln. in THF at room temp., 30-60 min; solvent was removed;