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5844341737
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6d,10 again supporting the view that the sensitizer radical anion is not involved in the deprotonation and all electrofugal groups are transferred to the solvent,
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5844323366
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note
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14c The present results show that the results with σ radical cations can be similarly rationalized,
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5844406176
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note
-
(a) Notice also that in the TCB reaction a small amount of the 6-alkylated benzenetetracarbonitrile (5), resulting from the alkylation at one of the unsubstituted positions, is formed besides the usual product of ipso substitution, viz. the 5-alkylated benzenetricarbonitrile (4), which, at any rate, remains the main one. A case of attack at the unsubstituted position of TCB has been previously observed, again as a minor path and again with an ether, 1,4-dioxane, ref 15b. We suggested that this products arises from an alternative mechanism, e.g., direct proton transfer within the contact radical ion pair (or exciplex) which has probably a different conformation when the donor contains an oxygen atom than when it is a hydrocarbon, ref 15b. At any rate this remains a minor path and has no bearing on the main mode of fragmentation of the radical cation.
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The extension of the method to different alkanes will be reported in a following paper concerning open-chain and cyclic alkanes. A related, but different, case is that of strained hydrocarbons, see ref 18b
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(a) The extension of the method to different alkanes will be reported in a following paper concerning open-chain and cyclic alkanes. A related, but different, case is that of strained hydrocarbons, see ref 18b.
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60
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5844381982
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in ref 6b, part C, p 70
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(b) Gassman, P. G., in ref 6b, part C, p 70.
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