Abstract
AbstractThe homogeneous catalyst systems Cp2MCl2/C2H5AlCl2 (Cp = cyclopentadienyl; M = Ti, Zr) were found to promote homooligomerization of internal and terminal alkynes. Studies using titana‐ and zirconacyclopentadienes without cocatalysts revealed that these molecules were likely formed in the reactions and were active catalytic intermediates. Isolation of expanded metallacycles indicated that the mechanism of oligomerization proceeded by successive insertion reactions to produce larger metallacycles, eventually giving linear oligomers of low molecular weight.
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