Investigations of the reactivity of pyridine carboxylic acids with diazodiphenylmethane in protic and aprotic solvents, Part I: Pyridine mono-carboxylic acids

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 2005 Serbia English Publisher:National Library of SerbiaJournal:Journal of the Serbian Chemical Society, volume 70, pages 557-567 (issn: 0352-5139, eissn: 1820-7421,

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Authors: Aleksandar Marinkovic; Sasa Drmanic; Bratislav Jovanovic; Milica Misic-Vukovic;

doi: 10.2298/jsc0504567m , 10.2298/jsc0504557m

handle: 21.15107/rcub_technorep_832

Investigations of the reactivity of pyridine carboxylic acids with diazodiphenylmethane in protic and aprotic solvents, Part I: Pyridine mono-carboxylic acids

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Abstract

Rate constants for the reaction of diazodiphenylmethane with isomeric pyridine carboxylic acids were determined in chosen protic and aprotic solvents at 30 ?C, using the well known UV spectrophotometric method. The values of the rate constants of the investigated acids in protic solvents were higher than those in aprotic solvents. The second order rate constants were correlated with solvent parameters using the Kamlet-Taft solvatochromic equation in the form: logk = logk0 + s?*+ a? + b?. The correlation of the obtained kinetic data were performed by means of multiple linear regression analysis taking appropriate solvent parameters. The signs of the equation coefficients were in agreement with the postulated reaction mechanism. The mode of the influence of the solvent on the reaction rate in all the investigated acids are discussed on the basis of the correlation results.

Country

Serbia

Related Organizations

University of Belgrade
Serbia

Keywords

Chemistry, diazodiphenylmethane, protic and aprotic solvents, pyridine carboxylic acids, QD1-999, rate constants, solvent parameters

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