SYNTHESIS, CHARACTERIZATION AND REACTIVITY OF PENTACARBONYL(η1-2,4-PENTADIENYL)MANGANESE

Article abstract of DOI:10.1016/S0022-328X(00)98977-0

Reaction of NaMn(CO)5 with trans 1-bromopenta-2,4-diene in tetrahydrofuran at -78 degC gives (η¹-2,4-pentadienyl)Mn(CO)5 (1) in excellent yield.Compound 1 undergoes η¹ -> syn-η³ -> η⁵ transformation and, yields (syn-η³-2,4-pentadienyl(Mn(CO)4 (2) and (η⁵-pentadienyl)Mn(CO)3 (3), respectively.The reactions of (1) with the electrophiles tetracyanoethylene (TCNE) and sulfur dioxide (SO2) were investigated.Compound 1 undergoes a <4 + 2> cycloaddition with TCNE and an insertion reaction with SO2.The products are characterized by elemental analysis and spectroscopic data.