NICKEL(0)-INDUZIERTE C-C-VERKNUEPFUNG ZWISCHEN KOHLENDIOXID UND ALKINEN SOWIE ALKENEN

Article abstract of DOI:10.1016/0022-328X(84)80129-1

CO2 and alkynes or alkenes undergo a 1/1 coupling in the presence of (Lig)Ni⁰ complexes to give five-membered cyclic nickela complexes of types V and XVII.The influence of temperature and of the ligands upon the regioselectivity of the C-C coupling in the case of monosubstituted olefins is reported, and the significance of these ring systems in preparative chemistry is emphasized.Oxanickelacyclopentenones (V) react with alkynes to form oxanickelacycloheptadienones (XIII).The structure of one of the compounds of this class has been determined by X-ray crystallography.Special features of these novel compounds, which can be readily prepared from CO2, are discussed together with the probable reaction mechanisms.