Abstract
Addition of phosphonoacetate anions to tricarbonyl(vinylketene)iron(0) complexes gave tricarbonyl(vinylallene)iron(0) complexes. Stereoselectivity as high as 98 : 2 was observed and the relative stereochemistry of the major stereoisomers was elucidated by X-ray crystal structure analysis of the major isomer of [Feo{PhCHCHC(Me)CCHCO2But}(CO)3]9d, the product obtained from the reaction between [Feo{PhCHCHC(Me)CO}(CO)3]7a and the anion of (EtO)2 P(O)CH2CO2But8b. Reaction of the major isomers of the tricarbonyl(vinylallene)iron(0) complexes with FeCl3 gave 5,5-disubstituted furan-2(5H)-ones.
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