O-Alkylthio- and O-alkylselenooxalate iron complexes: Structures of CpFe(CO) 2ECOCO 2Me and [CpFe(CO) 2ECO] 2

Abstract

When the iron sulfide complexes (μ-S x )[CpFe(CO) 2] 2 ( x = 2, 3) are treated with O-alkyl oxalyl chlorides ROCOCOCl the complexes CpFe(CO) 2SCOCO 2R ( 1) [R = Me ( a), Et ( b)] are obtained. Similarly, the complexes CpFe(CO) 2SeCOCO 2R ( 2) are obtained from the analogous iron selenide (μ-Se)[CpFe(CO) 2] 2 reaction with the same reagents. Treatment of the iron selenide with half equivalent of oxalyl chloride produces the dimeric complex [CpFe(CO) 2SeCO] 2 ( 3). The new complexes, 1, 2 and 3, have been characterized by elemental analyses, IR and 1H NMR spectroscopy. The solid state structures of 1a, 2a, 3 and [CpFe(CO) 2SCO] 2 ( 4) were determined by an X-ray crystal structure analysis.