INCORPORATION OF CARBON DIOXIDE IN ALKYNE OLIGOMERIZATION CATALYZED BY NICKEL(0) COMPLEXES. FORMATION OF SUBSTITUTED 2-PYRONES

Abstract

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.