Group VIIIA Iron, Ruthenium, and Osmium

In the presence of trityl perchlorate the ethyliron complex (C2H5)Fe(CO)2(C5H5) undergoes a hydride elimination reaction to afford the corresponding ethylene complex cation (253). Molecular 

Although the analogous w-propyl and isopropyl complexes both give the 77-propene complex cation, reversal of the reaction produces only the isopropyl species. 

In addition to (acrylonitrile)Fe(CO)4, Schubert et al. (533) have isolated two additional complexes of acrylonitrile (i) a volatile yellow 

In contrast, the alkyl-substituted imine complex (R = CH3, R = W-C4H9) reacts with P(CaH6)s to give free olefin and CFe(0)3[P(CeH6)s]2 454). 

At ambient temperature without irradiation, Fe 2(00)9 readily reacts with j8-chlorovinylketones 440) and unsaturated aldehydes or carboxylic acids 601) to produce the complexes (XCH=CHY)Fe(CO)4, (X = Cl, Y = COR or X = H, CH3, CeHs, COOH Y = CHO, COOH). Spectral data 601) indicate structure (62) in which only the olefinic double bond 

Gustorf and co-workers (264-266) have prepared complexes of the type (7r-CH2=CHX)Fe(CO)4 [X = OCOCH3 (266), Cl, CH3, CeHs, or OCH3 (265)] by irradiation of Fe(CO)5 with the corresponding olefin. The complexes are very oxygen-sensitive and thermally unstable. At room temperature they decompose to yield the olefin and Fe3(CO)i2. The order of thermal stability is vinyl chloride styrene propylene vinyl methyl ether. The vinyl chloride and styrene complexes show catalytic activity for polymerization of methyl methacrylate in the presence of a small amount of halogenated hydrocarbon, e.g., CCI4, at room temperature (265). 

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