NH acidities of some 3-(p-substitutedphenyl)-1,2,4-oxadiazol-5(4H)-ones and 4-(p-substitutedphenyl)-1,2 \lambda^43,5-oxathiadiazole 2-oxides were determined in methanol by means of potentiometric titration with sodium methoxide. pK_a values of the title compounds calculated from the potentiometric data were interpreted on the basis of structural effects caused by para-substituted groups on the phenyl ring by plotting pK_a values versus Hammett \sigma_p^+ constants, which gave excellent linear correlations.
DÜRÜST, NEDİME; DÜRÜST, YAŞAR; and GÖZLÜKAYA, EMİNE ÖZGE
"NH-acidities and Hammett correlation of 3-para substituted phenyl-1,2,4-oxadiazol-5(4H)-ones and 1,2 \lambda^43,5-oxathiadiazole 2-oxides in nonaqueous media,"
Turkish Journal of Chemistry: Vol. 38:
1, Article 5.
Available at: https://journals.tubitak.gov.tr/chem/vol38/iss1/5