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References and Notes
Carbonium ions, Vols. I–V. Olah, G. A., Schleyer, P. v. R., (eds.). New York: Wiley-Interscience 1968–1977
Johnson, W. S.: Bioorg. Chem. 5, 51 (1976)
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Preliminary reports of this work have appeared.
Hogeveen, H., van Kruchten, E. M. G. A.: J. Org. Chem. 42, 1472 (1977)
Hogeveen, H., van Kruchten, E. M. G. A.: Recl. Trav. Chim. Pays-Bas 96, 61 (1977) A full account, including experimental details, will be presented by EMGA v K in his forthcoming Ph. D. Thesis
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A Van der Waals shift is important in cases were the interatomic distance of two atoms is considerable smaller than the sum of the Van der Waals radii. See Jackman, L. M., Sternhell, S.: Applications of nuclear magnetic resonance spectroscopy in organic chemistry. Pergamon Press, 1969, p. 71
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For a more sophisticated set up to handle strong acids at low temperatures see: Kelly, D. P., Brown, H. C.: Aust. J. Chem. 29, 957 (1976)
For a more sophisticated set up to handle strong acids at low temperatures see: Ahlberg, P., Engdahl, C.: Chemica Scripta (Sweden) 11(2), 95 (1977)
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Brouwer, D. M., van Doom, J. A.: Reel. Trav. Chim., Pays-Bas 91, 261 (1972)
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The assignment is based on comparison with cyclopropyl substituted alkenyl cations; Olah, G. A., Spear, R. J.: J. Am. Chem. Soc. 97, 1539 (1975)
In ion 32 the CH3 signal at 6 2.90 is observed as a doublet (J = 1.4 Hz). This is due to a coupling between the bridgehead hydrogen at C-1 (or C-5) and the CH3 group at C-4 (or C-2), and not to a coupling between the hydrogen at C-1 (or C-5) and the CH3group at C-2 (or C-4). It is substantiated by the fact that in ion 32-d4 there is no such coupling. Presumably this coupling is an anlogous to the para coupling found in the hexamethylbenzenium ion i, in which J122-01= 2 Hz. See Ref.1), Vol. II, p. 866 122-01
Brouwer, D. M., Hogeveen, H.: Prog. Phys. Org. Chem. 9, 179 (1972)
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The importance of steric effects in this case is difficult to evaluate
Hogeveen, H., Volger, H. C.: Rec. Trav. Chim. Pays-Bas. 87, 385 (1968)
The formula applied is k = π (δv-δv *), δv being the width of the peak at half height and δv * being the natural width at half height in the absence of broadening. See Pople, J. A., Schneider, W. G., Bernstein, H. J.: High resolution nuclear magnetic resonance, Chapter 10. New York: McGraw Hill Book Company Inc. 1959
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In memory of Professor H. L. Meerwein, on the occasion of his hundredth birthday
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Hogeveen, H., van Kruchten, E.M.G.A. (1979). Wagner-meerwein rearrangements in long-lived polymethyl substituted bicyclo[3.2.0]heptadienyl cations. In: In Memory of H. L. Meerwein. Topics in Current Chemistry, vol 80. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0050203
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