Different enynols and propargyl derivatives were sumitted to radical hydrostannylation (Bu 3 SnH/ AIBN), Pd(0)-catalyzed hydrostannylation [Bu 3 SnH/Pd(0)], and stannylcupration [Bu 3 Sn(R)CuCNLi 2 ] conditions. Except for the radical stannylation reaction, high regio-and stereoselective formation of vinyl-and dienylstannanes are obtained. Results are tentatively explained in terms of steric Interactions between the alkyne or enyne substituents and the palladium or cuprate moieties in the different reaction intermediates.

No abstract