Abstract 1-Hexyne and carbon dioxide were allowed to react with the catalyst system, Ni(COD)2[COD=1,5-cyclooctadiene]-Ph2P(CH2)nPPh2 (n=1,2,3,4), to give 4,6-dibutyl-2-pyrone together with 1-hexyne oligomers.
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Inoue et al. (1977) studied this question.