Reactions of carbonyl compounds in basic solutions. Part 13. The mechanism of the alkaline hydrolysis of 3-(3-substituted phenoxy)phthalides, -3-methyl-phthalides, -3-phenylphthalides, naphthalides, -3-phenylnaphthalides, and phenanthralides, and of 3-substituted 3-methoxyphthalides
作者:Fredrick Anvia、Keith Bowden、Faiq A. El Kaissi、Victoria Saez
DOI:10.1039/p29900001809
日期:——
effects of substitution on the phenoxy esters have been assessed by means of, the Hammettequation. The results for the methyl esters are related to the steric effect of substituents using the Taft equation. All the pseudo-esters are hydrolysed with rate-determining attack by hydroxide anion at the carbonyl group, followed by rapid ring fission to form the carboxylate anion of the corresponding acid as the
Reactions of carbonyl compounds in basic solutions. Part 12. The mechanism of the alkaline hydrolysis of 3-substituted phenyl 2-acetyl- and 2-benzoyl-benzoates
作者:Fredrick Anvia、Keith Bowden
DOI:10.1039/p29900001805
日期:——
Rate coefficients have been measured for the alkalinehydrolysis of 3-substituted phenyl 2-acetyl-and 2-benzoyl-benzoates in 70%(v/v) dioxane–water at several temperatures. The enthalpies and entropies of activation have been evaluated. The effects of substitution have been assessed by means of the Hammett equation. Comparison of the reaction constants with those for model systems, as well as the relative