INFLUENCE OF STRUCTURE OF QUATERNARY AMMONIUM IONS ON ORTHO SUBSTITUTION REARRANGEMENT VERSUS 1,2-SHIFT WITH SODIUM AMIDE IN LIQUID AMMONIA. INFLUENCE OF TEMPERATURE.1
Equilibrium acidities and homolytic bond dissociation energies of the acidic carbon-hydrogen bonds in N-substituted trimethylammonium and pyridinium cations
作者:Xian Man Zhang、Frederick G. Bordwell、Michael Van Der Puy、Herbert E. Fried
DOI:10.1021/jo00063a026
日期:1993.5
Equilibrium acidities (pK(HA)s) of the cations in sixteen N-substituted trimethylammonium salts, one N-phenacylquinuclidinium salt, eight N-substituted pyridinium salts, and N-(ethoxycarbonyl)isoquinolinium bromide, together with the oxidation potentials of their conjugate bases, have been determined in dimethyl sulfoxide (DMSO) solution. The acidifying effects of the alpha-trimethylammonium groups (alpha-Me3N+) and the alpha-pyridinium groups (alpha-PyN+) on the adjacent acidic C-H bonds in these cations were found to average about 10 and 18 pK(HA) units, respectively, in DMSO. The homolytic bond dissociation energies of the acidic C-H bonds in these cations, estimated by the combination of the equilibrium acidities with the oxidation potentials of their corresponding conjugate bases (ylides), show that the alpha-trimethylammonium groups destabilize adjacent radicals by 2-6 kcal/mol, whereas alpha-pyridinium groups stabilize adjacent radicals by 3-6 kcal/mol. The effects of alpha-pyridinium groups on the stabilization energies of the radicals derived from these cations were found to be ca. 4-10 kcal/mol smaller than those of the corresponding phenyl groups, whereas their effects on the equilibrium acidities of the cations were 5.4-13.1 pK(HA) units larger. The pK(HA) value of tetramethylammonium cation (Me4N+) was estimated by extrapolation to be about 42 in DMSO.
Wittig; Felletschin, Justus Liebigs Annalen der Chemie, 1944, vol. 555, p. 133,137,144
作者:Wittig、Felletschin
DOI:——
日期:——
Anantakrishnan; Pasupati, Proceedings - Indian Academy of Sciences, Section A, 1941, vol. <A> 13, p. 211,216
作者:Anantakrishnan、Pasupati
DOI:——
日期:——
INFLUENCE OF STRUCTURE OF QUATERNARY AMMONIUM IONS ON ORTHO SUBSTITUTION REARRANGEMENT VERSUS 1,2-SHIFT WITH SODIUM AMIDE IN LIQUID AMMONIA. INFLUENCE OF TEMPERATURE.<sup>1</sup>
作者:CHARLES R. HAUSER、ROBERT M. MANYIK、WALLACE R. BRASEN、PHILIP L. BAYLESS
DOI:10.1021/jo01365a021
日期:1955.8
Ingold; Jessop, Journal of the Chemical Society, 1929, p. 2361