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Download fileMechanistic Features of Iridium Pincer Complex Catalyzed Hydrocarbon Dehydrogenation Reactions: Inhibition upon Formation of a μ-Dinitrogen Complex
journal contribution
posted on 1998-01-05, 00:00 authored by Do W. Lee, William C. Kaska, Craig M. JensenDeuterium-labeling studies show that vinyl
C−H oxidative addition of tert-butylethylene (tbe)
to
IrH2{C6H3-2,6-(CH2PBut2)2}
(1) is rapid and reversible,
while the stoichiometric hydrogenation of tbe by 1
is
slower and irreversible. The dinitrogen complex,
[Ir{C6H3-2,6-(CH2PBut2)2}]2(μ-N2)
(3), results from the
reaction of 1 with excess tbe under 1 atm of nitrogen.
A
single-crystal X-ray structure determination of 3
reveals
a perpendicular arrangement of the P−C−P pincer
ligands, which accounts for the surprising stability of
3
and the inhibiting effect of nitrogen on reactions catalyzed by 1.