Reaction of spiro[4.4]nona-1,3-diene(tricarbonyl)iron with ArLi (Ar = Ph, o-, p-CH3C6H4, p-CH3OC6H4, p-ClC6H4, p-C6H5C6H4) in ether at low temperature, followed by the alkylation of the resulting acylmetallates with Et3OBF4 in aqueous solution at 0癈 gave the unstable isomerized spiro[4.4]nona-1,3-diene(dicarbonyl)[ethoxy(aryl)carbene]iron complexes, which were transformed into the stable chelated allyliron phosphine adducts e.g., I by the addition reaction with phosphines in petroleum ether at low temperature Crystal structure of I was reported.

Key words: CRYSTAL STRUCTURE DETERMINATION, REACTION MECHANISM, MOLECULAR STRUCTURE, IRON COMPLEX, CHELATES, PHOSPHINE, ISOMER, ALLYL GROUP, SPIRO COMPOUNDS, NONENE P