Abstract
The synthesis of (diethyl 1-methylene- trans-2,3-cyclopropanedicarboxylate)iron tetracarbonyl in optically active form is described. This complex was oxidized with cupric bromide, and yielded its original trans-Feist's ester precursor with full retention of optical activity. The iron tetracarbonyl complex of the cis isomer was epimerized to the trans complex by sodium ethoxide in ethanol. A description of the nature of the bonding between the olefin and the metal in these complexes was derived from carbon-13 magnetic resonance experiments.
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