Abstract
The Cp2HfCl2/C2H5AlCl2 system (Cp = η5-cyclopentadienyl) was found to be an active homogeneous catalyst for the Oligomerization of both terminal and internal alkynes. Apparently, the mechanism of Oligomerization occurs by successive insertion of the alkyne into the hafnium-carbon bond of a cationic intermediate, as evidenced by the interception of the highly substituted, sterically bulky, 1-trimethylsily1-1-propyne.
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