om300084s_si_001.pdf (368.05 kB)
Acetylene Cyclotrimerization with an Iron(II) Bis(imino)pyridine Catalyst
journal contribution
posted on 2012-04-23, 00:00 authored by Samuel
S. Karpiniec, David S. McGuinness, George
J. P. Britovsek, Jim PatelAcetylene oligomerization with an activated iron bis(imino)pyridine
complex with low steric hindrance leads to benzene as the major product,
in contrast to this reaction with a more sterically encumbered analogue,
which leads to polyacetylene. The mechanism of benzene formation was
studied and likely occurs via metallacycle intermediates; this process
can be interrupted by addition of ZnEt2 as a chain transfer
agent to generate hexadiene instead.