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Direct Spectroscopic Characterization of a Transitory Dirhodium Donor-Acceptor Carbene Complex

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Science  18 Oct 2013:
Vol. 342, Issue 6156, pp. 351-354
DOI: 10.1126/science.1243200

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Catching a Carbene >>

Divalent carbon fragments, or carbenes, vary widely in their stability, depending on their substituents. Some, such as N-heterocyclic carbenes, are independently isolatable. Others can be isolated in coordination complexes with metals. Kornecki et al. (p. 351, published online 12 September) synthesized a carbene coordinated to a rhodium dimer representative of an elusive class of short-lived intermediates long postulated to underlie a series of cyclopropanation and C-H insertion reactions.

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