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0345455119
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23
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24644471362
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-
note
-
A third radical species is evident in the spectrum; however, even though its structure could not be identified, the spectroscopic parameter would ascribe it to an alkyl alkoxy nitroxide-type.
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24
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0000120621
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D. F. Bowman, T. Gillian, K. U. Ingold, J. Am. Chem. Soc. 1971, 93, 6555-6561.
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Ingold, K.U.3
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25
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24644497512
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-
note
-
Actually, primary nitrosoalkyl compounds can tautomerize to the corresponding oximes, which easily donate an H atom to lead to an iminoxyl radical RCH=NO(̇), a persistent a radical detectable by EPR spectroscopy; whereas, no evidence of this species was obtained in any of the experiments in which primary nitrosoalkyls were involved.
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-
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26
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0003426522
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a) D. F. Bowman, J. L. Brokenshire, T. Gillian, K. U. Ingold, J. Am. Chem. Soc. 1971, 93, 6551-6555;
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28
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33748407078
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Spin trapping
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(Eds.: V. Gold, D. Bethell), Academic Press, London
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c) M. J. Perkins in "Spin Trapping", Advances in Physical Organic Chemistry, Vol. 17 (Eds.: V. Gold, D. Bethell), Academic Press, London, 1980, pp. 1-64.
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Perkins, M.J.1
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29
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24644476871
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note
-
[15c] strongly stress that the fragmentation of tert-butoxy-tert-butyl nitroxides to give tert-butoxyl radicals is more rapid than that which gives tert-butyl radicals, by a factor of 100 (at 40°C).
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31
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0000376251
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b) A. Mackor, Th. A. J. W. Wajer, Th. J. de Boer, Tetrahedron 1968, 24, 1623-1631.
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32
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24644524950
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note
-
In ref. [17a], it is reported that "a second radical has spin density on a nitrogen atom of ∼ 25-30 G, and its EPR signal is predominant over that of the ordinary dialkyl nitroxide at temperature below -40 °C." In ref. [17b] it is reported that "the photolysis of the tBuONO in toluene would lead to the tert-butoxy benzyl nitroxide and dibenzyl nitroxide; but, at -40°C the alkoxy alkyl nitroxide is formed exclusively." Actually, it is interesting to note that these au thors had already noted the same behavior that we report, but could not account for it.
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33
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0000946114
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34
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0001016043
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37
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24644485886
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-
note
-
2N(Ȯ)-OtBu was detectable and to account for it, the intermediacy of the tBuONO has to be assumed.
-
-
-
-
38
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24644523500
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-
note
-
|21| of the intermediate 4-pentenyloxyl radical led us to the conclusion that the reverse reaction of Equation (35) is negligible, thus supporting an ultimate quantum yield of ≈ 1 for nitrite 16.
-
-
-
-
39
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0001544986
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Wiley, New York
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W. A. Noyes, Organic Syntheses, Vol. III, Wiley, New York, 1943, pp. 108-109.
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Noyes, W.A.1
-
40
-
-
24644449040
-
-
note
-
Hβ = 10.75 G) was also evident. This proves, once again, the efficiency of alkyl nitrite as a spin trap.
-
-
-
|