Ionenpaareffekte bei der Photolyse und Thermolyse von Aryldiazonium‐tetrafluoroboraten

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Abstract
Ion Pair‐Effects in the Photolysis and Thermolysis of Arenediazonium TetrafluoroboratesFluoroarenes produced by Schiemann‐reaction of p‐methyl‐ and p‐tert.‐butyl‐benzenediazonium tetrafluoroborates in solution are formed mainly from ArN2+/BF4−‐ion pairs. The ratio of product yields formed from the reaction of arene cations with the solvent to the yields of fluoroarenes increases with increasing KD/α; KD is the conductometrically determined dissociation constant, and α the dissociation degree of ion pairs. The photochemical and thermal dediazoniation gives the same product ratios, indicating, that both sorts of reactions proceed via the same intermediate — the arene cation.