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Title: Determination of protonation constants and structural correlations for some tertiary formamides and acetamides in sulfuric acid with UV spectroscopy
Authors: Stojković, Goran
Dimitrieska-Stojković, Elizabeta
Popovski, Emil 
Issue Date: 12-Nov-2015
Publisher: Society of Chemists and Technologists of Macedonia
Journal: Macedonian Journal of Chemistry and Chemical Engineering
Abstract: <jats:p><p>The protonation of ten aliphatic amides in sulfuric acid media was studied by UV spectroscopy. The p<em>K</em><sub>BH</sub><sup>+ </sup>values and solvation parameters were calculated using Yates and McClelland Method, Excess Acidity Method and Bunnett and Olsen Method. p<em>K</em><sub>BH</sub><sup>+</sup> values were –1.44, –1.15, –0.80, –0.32, –1.13 and –0.80 for formamide, dimethylformamide, diethylformamide, diisopropylformamide, diisobutyl­form­amide and dibutylformamide, respectively. According to the p<em>K</em><sub>BH</sub><sup>+</sup> values obtained for acetamide, dimethylacetamide, diethylacetamide and diisopropylacetamide (–0.57, –0.29, –0.32 and 0.36, respectively), analogous acetamides were more basic than formamides. Applying the Hammett’s equation, satisfactory correlation could be gained only for some formamides, the basicities of which increased linearly with the inductive effect of the electron donating groups. From Taft’s approach, it can be concluded that the polar effect slightly dominates over the steric one. Excellent correlation between p<em>K</em><sub>BH</sub><sup>+ </sup>and solvation parameters<em> m* </em>was achieved for formamide, dimethylformamide and diethylformamide. At half- and full-protonation, better correlation was obtained for formamides than for acetamides.</p></jats:p>
DOI: 10.20450/mjcce.2015.702
Appears in Collections:Faculty of Natural Sciences and Mathematics: Journal Articles

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XIII_2099.pdfG. Stojković, E. Dimitrieska-Stojković, E. Popovski, Determination of protonation constants and structural correlations for some tertiary formamides and acetamides in 302 sulfuric acid with UV spectroscopy, Macedonian Journal of Chemistry and Chemical Engineering, 34(2), 255–265 (2015).1.73 MBAdobe PDFView/Open
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