Fe-Catalyzed Structurally Divergent γ-Polyhaloalkylation of Si- loxydienes

Regioselective γ-polyhaloalkylation is achieved using tetrahalomethanes or α,α,α-trihaloalkyl compounds and siloxydienes via Fe(II) catalysis. A range of siloxydienes are functionalized in good yield and high stereoselectivity under mild reaction conditions. Structural divergence is observed as either haloalkylated or haloalkenylated products are formed based on substitution pattern of the siloxydiene. The halogenated products show utility in further synthetic transformations selec- tive reduction and cross coupling reactions.