Reaktionen von Propiolaldehydacetalen mit Dicarbonylcyclopentadienylmangan-Fragmenten

Abstract

Reactions of a dicarbonylcyclopentadienylethermanganese complex ( 1) with propiolic aldehyde acetals ( 2) yield the mononuclear dicarbonylcyclopentadienyl-η 2-(propiolic aldehyde acetal)manganese compounds CpMn(CO) 2HCCCH(OR) 2 (R  Me, 3a; R  Et, 3b; (OR) 2O(CH 2) 3O, 3c). In addition dinuclear bis(dicarbonylcyclopentadienyl)dialkoxymethylvinylidene complexes [CpMn(CO) 2] 2CC(H)CH(OR) 2 (R  Me, 5a; R  Et, 5b and (OR) 2O(CH 2) 3O, 5c) and a bis(dicarbonylcyclopentadienylmanganese)-2-carbaldehydevinylidene species ( 5d) have been isolated. These dinuclear compounds were also obtained via dicarbonylcyclopentadienyl(dialkoxymethylvinylidene)manganese derivatives CpMn(CO) 2CC(H)CH-(OR) 2 (R  Me, 4a; R  Et, 4b; (OR) 2O(CH 2) 3O, 4c), which were synthesized by an independent route. 3c, 5c and 5d were characterized by X-ray analyses diffraction studies.