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33847805542
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4 times faster than tert-butyl chloride, consistent with a MM estimate of 6.8 kcal/mol strain relief for bridgehead conversion to a trigonal center. Parker, W.; Tranter, R. L.; Parker, W.; Watt, C. I. F.; Chang, L. W. K.; Schleyer, P. v. R. J. Am. Chem. Soc. 1974, 96, 7121.
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(c) Coll, J. C.; Crist, D. R.; Barrio, M. d. C. G.; Leonard, N. J. J. Am. Chem. Soc. 1972, 94, 7092.
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84951251000
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Krusic, P. J.; Kochi, J. K. J. Am. Chem. Soc. 1968, 90, 7155. In a typical experiment a solution of 5 mg of manxane and 30 μL of di-tert-butyl peroxide in 260 μL of solvent was prepared in a quartz EPR tube, degassed by 3 freeze-pump-thaw cycles, and photolyzed directly in the cavity of a Varian E4 spectrometer with the unfiltered light of a 500 W high-pressure mercury lamp.
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Kochi, J.K.2
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23
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33646955945
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note
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+, 31), 124 (27), 109 (47), 96 (100), 81 (91), 67 (85), 55 (60).
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-
-
-
24
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37049115520
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H = 1.8 G (2H). The 1.8 G meta-H hyperfine and the absence of β-hydrogen splittings indicate exclusive addition at the oxygen atom of TBN by an unreactive tertiary radical such as 1, consistent with the observed multiminute trapping time. Terabe, S.; Konaka, R. J. Chem. Soc., Perkin Trans. 2 1973, 369.
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Terabe, S.1
Konaka, R.2
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25
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37049089042
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A recent model relating activation energies to reaction expthermicities suggests that for tert-butoxyl abstracting H from alkanes barrier heights change by roughly 30-40% of reaction energy differences. Roberts, B. P.; Steel, A. J. J. Chem. Soc., Perkin Trans. 2 1994, 2155.
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Roberts, B.P.1
Steel, A.J.2
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26
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33947290546
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The EPR simulation program used in this work was written at Michigan State University by Andrew S. Ichimura for use with the nonlinear least squares fitting program KINFIT (Dye, J. L.; Nicely, V. A. J. Chem. Educ. 1971, 48, 443).
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Dye, J.L.1
Nicely, V.A.2
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27
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37049097354
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Preliminary analysis of the experimental EPR spectrum was also performed using the program MATCH (Jackson, R. A. J. Chem. Soc., Perkin Trans. 2 1983, 523).
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J. Chem. Soc., Perkin Trans. 2
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Jackson, R.A.1
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0001516239
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Kurreck, H.; Kirste, B.; Lubitz, W. Angew. Chem., Int. Ed. Engl. 1984, 23, 173.
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Kurreck, H.1
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33947313655
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Pople, J. A.; Beveridge, D. L.; Dobosh, P. A. J. Am. Chem. Soc. 1968, 90, 4201.
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Pople, J.A.1
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Alder, R. W.; Sessions, R. B.; Symons, M. C. R. J. Chem. Res., Synop. 1981, 82.
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Alder, R.W.1
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34
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33646965193
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note
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β bonds, which should make hyperconjugation less effective.
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35
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0042644715
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Krusic, P. J.; Rettig, T. A.; Schleyer, P. v. R. J. Am. Chem. Soc. 1972, 94, 995.
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Schleyer, P.V.R.3
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38
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0000732245
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This process is reminiscent of the case of halobicyclo[1.1.1]pent-1-yl radicals, where evidence was found for a new γ-disproportionation process in which the γ-fluorine (or chlorine) atom was transferred from the 3-fluoro (or 3-chloro) radical to a triethylsilyl or to a second bicyclo[1.1.1]pent-1-yl radical to yield, in both cases, [1.1.1]propellane. Adcock, W.; Binmore, G. T.; Krstic, A. R.; Walton, J. C.; Wilkie, J. J. Am. Chem. Soc. 1995, 117, 2758.
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Adcock, W.1
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Walton, J.C.4
Wilkie, J.5
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39
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33645170959
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Our thanks go to Professor Roger Alder, who kindly provided us with [3.3.3]propellanedione, converted to [3.3.3]propellane by Kishner-Wolff reduction according to the literature procedure. Weber, R. W.; Cook, J. M. Can. J. Chem. 1978, 56, 189.
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Cook, J.M.2
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