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Abstract
Recently, considerable interest has been shown in the reaction of carbon dioxide with olefins or alkynes caused by transition metal complexes. Incorporation of CO2 in oligomerizations of butadiene1) and 1-hexyne2) has been performed to give lactone derivatives by Pd-Ph2 PCH2 CH2 PPh2 and Ni (COD)2-Ph2P(CH2)4PPh2 (COD : 1,5-cyclooctadiene) systems, respectively. Very recently, Jolly et al. reported the reaction of CO2 with π-allylnickel complexes which are the key intermediates of the oligomerization of diolefins.3) For example, bis (η-methylallyl) nickel reacts with CO2 in the presence of a phosphine ligand to give a nickel carboxylate complex: