Nikel(0) cyclopropene complexes are usually only detected as reactive inter
mediates during the oxidative cyclization of cyclopropenes at the Ni(0) sit
e. In contrast, it was possible to isolate and structurally characterize su
ch a Ni(0) cyclopropene complex: from the reaction of [(bipy)Ni(COD)] with
dimethyl 3-methyl-3-tert-butyl-1-cyclopropene-1,2-dicarboxylate.