Synthesis of Oligo-enynes Using [Fe(alkene)(CO)n] Scaffolds. Z/E-Selective Wittig- and Horner-type Olefination Reactions of η-Carbonyl Groups in η4-Diene and γ-Carbonyl Groups in η2-Alkene Complexes of Iron
Abstract
β-Oxo-dienetricarbonyliron complexes 4 and γ-oxo-alkenecarbene complexes 5 undergo olefinations with a wide range of phosphonates and phosphoranes with high E- or Z-selectivity and give the free oligo-en(yn)es or carbamates, respectively, upon oxidative demetalation.