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 k2(20 °C) = sN(N + E). The E parameters range from −12 to −15
Electrophilicity of 5-Benzylidene-1,3-dimethylbarbituric and -thiobarbituric Acids
作者:Florian Seeliger、Stefan T. A. Berger、Grygoriy Y. Remennikov、Kurt Polborn、Herbert Mayr
DOI:10.1021/jo071273g
日期:2007.11.1
[Graphics]The kinetics of reactions of acceptor-stabilized carbanions 2a-m with benzylidenebarbituric and -thiobarbituric acids 1a-e has been determined in a dimethyl sulfoxide solution at 20 degrees C. Second-order rate constants were employed to determine the electrophilicity parameters E of the benzylidenebarbituric and -thiobarbituric acids la-a according to the correlation equation log k(20 degrees C) = s(N + E). With E parameters in the range of -10.4 to -13.9, the electrophilicities of la-a are comparable to those of analogously substituted benzylidenemalononitriles.
ZIYATDINOV, R. N.
作者:ZIYATDINOV, R. N.
DOI:——
日期:——
Terrier, Francois; Goumont, Regis; Pouet, Marie-Jose, Journal of the Chemical Society. Perkin transactions II, 1995, # 8, p. 1629 - 1638