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Das Verhalten der Methylencyclohexadiene (I), (III) und (V) bzw. ihrer durch Protonierung entstehenden Carboniumionen (II), (IV) und (VI) in [D]Tri‐ Fluoressigsäure und [D2]Schwefelsäure wird H‐NMR‐ und massenspektrometrisch untersucht.

Relative Mobility of the Nitro Group in meta-Substituted Nitrobenzenes under the Action of 4-Bromophenol in the Presence of Potassium Carbonate.-The relative mobility of the nitro group in meta-substituted nitrobenzenes (I) and (IIIa)-(IIIc) is studied in the single and competitive substitution by p-bromophenol (II). Nucleophilic attack of the phenolate ion affords an ipso-σ-complex which under cleavage of the nitro group gives phenoxybenzenes (III) and (V). A direct correlation between the relative nitro group mobility (rate of substitution) and the σ-constants of meta-substituents is observed. -(TABATSKAYA, A. A.; VYALKOV, A. I.; MOROZOV, S. V.; VLASOV, V. M.; Zh.