Journal of Organic Chemistry p. 6053 - 6057 (1988)
Update date:2022-08-17
Topics:
Astles, D. J.
Girard, M.
Griller, D.
Kolt, R. J.
Wayner, D. D. M.
9,9'-Dianthrylcarbene was investigated by using laser flash photolysis, conventional flash photolysis, and optical modulation spectroscopy.Its optical absorption spectrum was characterized by two strong bands at 355 nm (ε 3.9E4 M-1cm-1) and at 445 nm (ε 2.9E4 M-1cm-1).Although the carbene has a triplet ground state, the rate constant for spin-allowed reaction with oxygen was ca. 5E5 M-1s-1, yet it underwent self-reaction at the diffusion-controlled limit.These unusual kinetic properties stem from the fact the carbene has a structure in which the unpaired electrons are highly delocalized.
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