The first metal‐induced syntheses of dicarboxylic acids from ethylene and the C 1 building block CO 2 have been achieved by use of the title compound 2 , an unsaturated 16‐electron Fe 0 system. By addition of ligands, the reactions can be controlled to give either the methylmalonic acids 1 or the isomeric succinic acids 3 preferentially. equation image
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Hoberg et al. (1987) studied this question.