Thermische und Photo-induzierte Substitutionsreaktionen an der Eisen-ethyl-Verbindung CpFe(CO)₂Et. Die Molekülstruktur von CpFe(PMe₃)₂COEt (Cp =η⁵-C₅H₅)/ Thermal and Photo-Induced Substitution Reactions of the Iron Ethyl Compound CpFe(CO)₂Et. The Molecular Structure of CpFe(PMe₃)₂COEt (Cp = η⁵-C₅H₅)

Abstract

Abstract The photo-induced reaction of CpFe(CO) 2 Et (1) with either trimethylphosphane or trimethylphosphite (L) in solution results in formation of the substitution products CpFe(CO)(L)Et (3), CpFe(L) 2 Et (5), and the hydrido complexes CpFe(CO)(L)H (4), and CpFe(L) 2 H (0). In contrast, the thermal reaction of 1 with L yields the adduct CpFe(CO)(L)COEt (7) and the dimeric compound Cp 2 Fe 2 (CO) 3 L. Under photochemical conditions, the terminal carbonyl ligand in 7 can be replaced by L to give the derivative CpFe(L) 2 COEt (8). According to a crystal structure determination of CpFe(PMO 3 ) 2 COEt, the complex possesses a η 1 -bonded propionyl ligand. The IR and NMR data, however, are indicative for a η 2 -bonded propionyl ligand.