Complex 1 is a key intermediate in the Ni0‐promoted CC bond formation between alkenes and CO2; it contains 1,8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU) as ligand. The NiC bond of 1 can participate in further, regioselective insertion reactions with alkenes. The nickelacycle is thus a model complex for the study of Ni‐catalyzed reactions.

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The first metal‐induced syntheses of dicarboxylic acids from ethylene and the C1 building block CO2 have been achieved by use of the title compound 2, an unsaturated 16‐electron Fe0 system. By addition of ligands, the reactions can be controlled to give either the methylmalonic acids 1 or the isomeric succinic acids 3 preferentially.

The complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 147. DOI:10.1002/anie.198201470