(Diphenylphosphinoyl)oxyl: An extremely reactive oxygen-centered radical

  1. Get@NRC: (Diphenylphosphinoyl)oxyl: An extremely reactive oxygen-centered radical (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1021/jo00289a042
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Journal titleJournal of Organic Chemistry
Pages624631; # of pages: 8
AbstractThe title radical, Ph 2P(O)O •, has been generated by laser flash photolysis (LPP) of the peroxide [Ph 2P(O)O] 2 (1) in CH 3CN solution. It has a broad, structureless absorption extending from 400 to beyond 800 mn. Absolute bimolecular rate constants k for its reactions with various organic substrates have been measured by LFP. It has been found that Ph 2P(O)O • is more reactive in hydrogen abstraction (e.g., cyclohexane, k = 2.4 × 10 8 M -1 s -1) and addition (e.g., benzene, k = 9.1 7times; 10 8 M -1 s -1) than any other organic oxygen-centered radical. Only HO • is (generally) more reactive. Although Ph 2P(O)O • could not be directly detected by EPR spectroscopy, it was successfully spin-trapped with a nitrone and with alkenes and alkynes. The formation of Ph 2P(O)O • in the photodecomposition but not in the thermal decomposition of 1 is supported by 31P NMR analyses of reaction products. Semiempirical AM1-PM3 calculations on H 2P(O)O • are also reported.
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AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21276747
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Record identifierf4ef83ea-8ecf-4a5b-8a9c-c0705d98560e
Record created2015-10-13
Record modified2016-05-09
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