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An Electron Spin Resonance Study of Several 1,4-Dihydro-s-tetrazine Cation Radicals

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Author
Tolles, W.M.
McBride, William R.
Thun, Wayne E.
Date
1969-05-01
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Abstract
The one-electron oxidation of 1,4-dihydro-s-tetrazines using concentrated iodine solutions of tetrahydrofuran as oxidant gives rise to a new class of relatively stable cation radicals. In the presence of water and air these radical cations in solution are stable for periods of hours to several days. The esr spectra for radical cations of 1,4-dimethyl-, 1,4-diphenyl-, 1,4-dimethyl-3,6-diphenyl-1, ,3,4,6-tetraphenyl-, and 1,4-bis(p-bromopheny1)-3,6- diphenyl-l,4-dihydro-s-tetrazineasr e interpreted and compared with molecular orbital calculations using the CND0/2 method to obtain the molecular orbital parameters. Assignment of the esr nitrogen coupling constants indicates nearly the same value for the five members of the series studied. The formation of the previously unreported 1, 4-dimethyl-1,4-dihydro-s-tetrazine, first identified as its radical cation in several different reactions, is discussed.
Description
The article of record as published may be found at http://dx.doi.org/10.1021/ja01038a007
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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http://hdl.handle.net/10945/48680
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