90322-06-8Relevant academic research and scientific papers
Phase-Transfer-Catalyzed Azo Coupling Reactions in Two-Phase Systems
Hashida, Yoji,Kubota, Kazuhiro,Sekiguchi, Shizen
, p. 905 - 910 (1988)
The azo coupling reaction of p-methoxybenzenediazonium tetrafluoroborate with N,N-dimethylaniline has been investigated in a water-1,2-dichloroethane system.It has been found that, among the several additives examined, the phenolate ion, generated from picric acid or 2,4-dinitro-1-naphthol, acted as an effective phase-transfer catalyst.Further, the reaction of p-diethylaminobenzenediazonium tetrafluoroborate with dimedone, and active methylene compound, has also been investigated in the same two-phase system; a remarkable acceleration in the rate was observed in the presence of tetraalkyl onium salts, and even in their absence.
Electrophilicities of trans-β-nitrostyrenes
Zenz, Ivo,Mayr, Herbert
experimental part, p. 9370 - 9378 (2012/01/06)
The kinetics of the reactions of the trans-β-nitrostyrenes 1a-f with the acceptor-substituted carbanions 2a-h have been determined in dimethyl sulfoxide solution at 20 °C. The resulting second-order rate constants were employed to determine the electrophile-specific reactivity parameters E of the trans-β-nitrostyrenes according to the correlation equation log k 2(20 °C) = sN(N + E). The E parameters range from -12 to -15 on our empirical electrophilicity scale (www.cup.lmu.de/oc/mayr/DBintro. html). The second-order rate constants for the reactions of trans-β- nitrostyrenes with some enamines were measured and found to agree with those calculated from the electrophilicity parameters E determined in this work and the previously published N and sN parameters for enamines.
