PALLADIUM COMPLEX-CATALYZED CARBOCYCLIZATION-DISTANNYLATION, CARBOCYCLIZATION-DISILYLATION AND CARBOCYCLIZATION-SILASTANNYLATION OF BIS-DIENES USING DISTANNANES, DISILANES AND SILYLSTANNANES

Bis-dienes 4 react with distannanes 1, disilanes 2, and silylstannanes 3 in the presence of a catalytic amount of a palladium complex to aff ord carbocyclization-distannylation, -disilylation and -silastannylati on products in high yields. Reaction of distannanes 1a, b with bis-die nes 4a, b as well as reaction of disilane 2b with bis-diene 4d proceed ed regio- and stereo-selectively to afford a single product: trans-(E) ,(Z) isomers. Regio- and stereo-selective reaction was also realized w ith the disilane 2b and bis-diene 4e to provide only trans-(E),(E) iso mer. In other cases, the reactions proceeded regioselectively, but the stereoselectivity was modest. The X-ray crystal structures of the cyc lopropanes 10 and 11 have been determined.