Abstract (η 3-Allyl) Fe (CO) 2 NO complexes undergo conjugate addition to α, β-unsaturated carbonyl compounds to give the corresponding δ, ϵ-unsaturated carbonyl compounds in good yields. The reaction of (η 3-1-or 2-trimethylsiloxyallyl) Fe (CO) 2 NO complexes with α, β-unsaturated ketones affords 1, 6-or 1, 5-diketones, respectively.(η 3-1-Acetonylallyl) Fe (CO) 2 NO complexes also react with α, β-unsaturated carbonyl compounds to give 1, 8- ...