Journal
CHEMICAL SCIENCE
Volume 5, Issue 7, Pages 2874-2878Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4sc00108g
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Funding
- Director, Office of Science, Office of Basic Energy Sciences of the US Department of Energy [DE-AC02-05CH11231]
- National Institutes of Health [GM 40392]
- Gerhard Casper Stanford Graduate Fellowship
- Achievement Rewards for College Scientist (ARCS) Foundation
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A dianionic, square planar cobalt(II) complex reacts with O-2 in the presence of acetonitrile to give a cyanomethylcobalt(III) complex formed by C-H bond cleavage. Interestingly, PhIO and p-tolyl azide react similarly to give the same cyanomethylcobalt(III) complex. Competition studies with various hydrocarbon substrates indicate that the rate of C- H bond cleavage greatly depends on the pK(a) of the C-H bond, rather than on the C- H bond dissociation energy. Kinetic isotope experiments reveal a moderate KIE value of ca. 3.5 using either O-2 or PhIO. The possible involvement of a cobalt(IV) oxo species in this chemistry is discussed.
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