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Spin trapping of cyclopentadienyl radicals using nitroso compounds and nitrones

Journal Article


Abstract


  • Cyclopentadienyl radicals C5H4X. (X = H or Me) generated in various solvents either chemically or photochemically from Hg(C5H4X)2 have been trapped using nitrosodurene (ND), phenyl(t-butyl)nitrone (PBN), and 3,4-dihydro-2,2-dimethyl-2H-pyrrole N-oxide (DMPO) to afford radical adducts identifiable by e.s.r. spectroscopy. For X = H the ND adduct (1) gives rise to a six-line e.s.r. spectrum in toluene having a(N) ca. 13.5 G and a(H) ca. 6.5 G. In contrast, production of (1) by photolysis in CHCI3 is accompanied by the appearance of a species (7) with a four-line e.s.r. spectrum, assigned to the H'/N D (aminoxyl) adduct. For X = Me, with ND as spin trap, overlapping e.s.r. spectra which correspond to adduct formation at points of maximum spin-density [C(1) and C(3), C(4)] are resolved. Similar spin trapping of radicals derived photolytically from C5Me5H is also described.

Publication Date


  • 1986

Citation


  • Barker, P. J., Stobart, S. R., & West, P. R. (1986). Spin trapping of cyclopentadienyl radicals using nitroso compounds and nitrones. Journal of the Chemical Society, Perkin Transactions 2, (1), 127-130. doi:10.1039/P29860000127

Scopus Eid


  • 2-s2.0-37049087619

Start Page


  • 127

End Page


  • 130

Issue


  • 1

Abstract


  • Cyclopentadienyl radicals C5H4X. (X = H or Me) generated in various solvents either chemically or photochemically from Hg(C5H4X)2 have been trapped using nitrosodurene (ND), phenyl(t-butyl)nitrone (PBN), and 3,4-dihydro-2,2-dimethyl-2H-pyrrole N-oxide (DMPO) to afford radical adducts identifiable by e.s.r. spectroscopy. For X = H the ND adduct (1) gives rise to a six-line e.s.r. spectrum in toluene having a(N) ca. 13.5 G and a(H) ca. 6.5 G. In contrast, production of (1) by photolysis in CHCI3 is accompanied by the appearance of a species (7) with a four-line e.s.r. spectrum, assigned to the H'/N D (aminoxyl) adduct. For X = Me, with ND as spin trap, overlapping e.s.r. spectra which correspond to adduct formation at points of maximum spin-density [C(1) and C(3), C(4)] are resolved. Similar spin trapping of radicals derived photolytically from C5Me5H is also described.

Publication Date


  • 1986

Citation


  • Barker, P. J., Stobart, S. R., & West, P. R. (1986). Spin trapping of cyclopentadienyl radicals using nitroso compounds and nitrones. Journal of the Chemical Society, Perkin Transactions 2, (1), 127-130. doi:10.1039/P29860000127

Scopus Eid


  • 2-s2.0-37049087619

Start Page


  • 127

End Page


  • 130

Issue


  • 1