Received S e p t e m b e r 5, 1979Treatment of the compounds ~6-C5H5Fe(C0)2CHR1CH~R* (R = H, alkyl, aryl) with Ph3CfBF4-results in abstraction of a 8-hydrogen atom to give triphenylmethane and the cationic olefin complexes, [ T~-C~H~F~-(C0)2(CHR1CHR2)]+BF4-; liberation of the olefins can be effected by treatment with sodium iodide in acetone. The reactions have synthetic utility because (a) 1-and 2-alkyliron compounds generally give only the terminal olefin and (b) 3-alkyliron compounds give only (2)-2-olefins. The thermodynamically more stable E internal olefins are not formed. Optimum reaction conditions and compatibility of various functional groups with the reaction conditions are also discussed,

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