ESR investigation of kinetic basicity of N-methyl-4-piperidone

Autor:	A. I. Prokof'ev, S. N. Nikol'skii, Sh. S. Tul'baev, Z. M. Muldakhmetov, A. S. Masalimov, I. B. Bakeev
Rok vydání:	1991
Předmět:	Semiquinone Proton Chemistry Intermolecular force General Chemistry Activation energy Keto–enol tautomerism Proton-coupled electron transfer Kinetic energy Photochemistry Reversible reaction
Zdroj:	Theoretical and Experimental Chemistry. 27:163-167
ISSN:	1573-935X 0040-5760
DOI:	10.1007/bf01372468
Popis:	Kinetic and thermodynamic parameters of the reversible reaction of proton transfer between 3,6-di-tert-butyl-2-hydroxyphenoxyl and N-methyl-4-piperidone have been investigated by means of ESB. It has been found that proton transfer from the semiquinone radical to the piperidone leads to enolization of the keto-base; and the ESR spectrum of the system undergoes a broadening of the HFS lines, which is characteristic for intermolecular proton exchange. The existence of a keto-enol equilibrium in the piperidone is also responsible for a negative value of the activation energy of the forward reaction of proton transfer.
Databáze:	OpenAIRE
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