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Tytuł artykułu
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Języki publikacji
Abstrakty
The mechanism of the hydrolysis of a series of Schiff bases derived from p-phenylenediamine and various aromatic aldehydes has been examined in aqueous media containing 40 wt% methanol, in the presence of NaOH. The base hydrolysis reaction of these compounds is strictly second-order kinetics, first-order with respect to the Schiff base and also to hydroxide ion, and the hydroxide ion attack on the free base becomes the rate-determining step under these basic conditions. The work is extended to include a systematic kinetic study on the hydrolysis reaction of the Schiff bases under investigation, in partially aqueous solutions of different pH's, in media containing 40 wt% methanol. Arate profile diagram of pH versus hydrolysis rate constant for all of the Schiff bases shows that the rate is minimal at alkaline region (pH > 8.96), and too rapid at strongly acidic media (pH < 3.53).
Słowa kluczowe
Wydawca
Czasopismo
Rocznik
Tom
Strony
79--91
Opis fizyczny
Bibliogr. 28 poz., rys.
Twórcy
autor
- Chemistry Department, Faculty of Science, Aswan, Egypt
autor
- Chemistry Department, Faculty of Science, Aswan, Egypt
autor
- Chemistry Department, Faculty of Science, Aswan, Egypt
Bibliografia
- 1. Witkop B. and Ramachandran L.K., Metabolism, 13, 1016 (1964).
- 2. Morton R.A. and Pitt G.A.J., Biochem. J., 59, 128 (1955).
- 3. Grazi E.. Rowley R.T., Cheng T., Tchola O. and Horecker B.L., Biochem. Biophys. Res. Commun., 9,38 (1962).
- 4. Fridovitch I. and Westheimer F.H., J. Am. Chem. Soc., 84, 3208 (1962).
- 5. Hammes G.G. and Fasella R, J. Am. Chem. Soc84, 4644 (1962).
- 6. Ganguin K.O., J. Phot. Set.,9, 172 (1961).
- 7. Cohen L.A. and Witkop B., Angew. Chem., 73, 253 (1961).
- 8. Witkop B., Advan. Protein Chem., 16, 221 (1961).
- 9. Cordes E.H. and Jencks W.R, Biochem., 1, 773 (1962).
- 10. Mahmoud M.R., Hamed M. M. A. and Shaker A. M., J. Soln. Chem., 15, 765 (1986).
- 11. Adam F.A., El-Haty M.T., Khalafalla A.K. and Gabr A. A., J. Chin. Chem. Soc., 36, 153 (1989).
- 12. El-Taher M.A., J. Soln. Chem., 25,401 (1996).
- 13. EI-Taher M.A,, Psk. J. Sei. Ind. Res., 42, 78 (1999).
- 14. Ren B.X., Zeng Y.X. and Jin M.Q., Comments Inorg. Chem.,9,22\ (1990).
- 15. Britton H.T.S., Hydrogen Ions, Chapman and Hall, London, 4 ed,, p. 313 (1952).
- 16. Douheret G., Bull. Soc. Chim. Fr., 1412(1967).
- 17. Forst A.A. and Pearson G.R, Kinetic and Mechanism, 2 ed., John Wiley &. Sons, NY, London (1961).
- 18. Bruyiants A. and Medicis E.F., The Chemistry of the Carbon-Nitrogen Double Bond, Patai S., Ed., Interscience, London, NY, p. 484 (1970).
- 19. El-Haty M.T., Mahamed A.E., Adam F.A. and Gabr A. A., Spectrochim. Acta, 46A, 1743 (1990).
- 20. EI-Taher M.A. and Gabr A.A., Talanta, 43, 1511 (1996).
- 21. Gabr A.A., Spectrochim. Acta, 46A, 1751 (1990).
- 22. Saeed A.A.H. and Matti G.Y., Cand. J. Spectrosc., 25, 29 (1980).
- 23. Mockler G.M., Chaffey G.W., Sinn E. and Wong H., Inorg. Chem., 11, 1308 (1972).
- 24. Biradar N.S. and Kulkarm V.H., J. Inorg. Nucl. Chem., 33, 2451 (1971).
- 25. Adam F.A., El-Haty M.T, and El-Gyar S.A., J. Indian Chem. Soc., 65, 651 (1988).
- 26. Et-Taher M.A., J. Chin. Chem Soc., 45, 815 (1998).
- 27. Reeves R.L., J. Am. Chem. Soc., 84, 3332 (1962).
- 28. Charette J.J. and Hoffmann E., J. Org. Chem., 44, 2256 (1979).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUJ1-0016-0062