Temperature-jump study of the kinetics of reactions of arylethylmalonate monoanions with hydroxide ion. The effect of ring substituents

Autor:	Toshiaki Yoshioka, Okitsugu Kajimoto, Yoshikazu Nishigaki, Takayuki Fueno
Rok vydání:	1973
Předmět:	chemistry.chemical_compound Aqueous solution Reaction rate constant chemistry Temperature jump Inorganic chemistry Potentiometric titration Electronic effect Physical chemistry Hydroxide Equilibrium constant Reversible reaction
Zdroj:	Journal of the Chemical Society, Perkin Transactions 2. :738
ISSN:	1364-5471 0300-9580
DOI:	10.1039/p29730000738
Popis:	The second-order rate constants kf of proton transfer reactions from ring-substituted arylethylmalonate mono-anions toward hydroxide ions, AH–+ OH–→ A2–+ H2O, in aqueous solution were measured by the temperature-jump relaxation method. The equilibrium constants K for the reversible reactions were also determined by potentiometric titrations. Logarithms of both the rate and equilibrium constants obtained at 33 °C were found to be linearly correlated with Taft's substituent constants σ0; log kf,X/kf,H= 0·38σ0 and log KX/KH= 0·93σ0. The results clearly indicate that the rates of both the forward and backward reactions are influenced by the electronic effects of substituents.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bd11ddabc4b80db05212dff3e2e9f5c8 https://doi.org/10.1039/p29730000738 Zobrazit plný text záznamu