Please use this identifier to cite or link to this item: http://ir.library.ui.edu.ng/handle/123456789/4683
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dc.contributor.authorADENLE, M. A.-
dc.date.accessioned2019-05-20T13:20:39Z-
dc.date.available2019-05-20T13:20:39Z-
dc.date.issued1975-
dc.identifier.otherui_thesis_adenle_m.a._reactions_1975-
dc.identifier.urihttp://ir.library.ui.edu.ng/handle/123456789/4683-
dc.descriptionA THESIS SUBMITTED TO THE UNIVERSITY OF IBADAN FOR THE DEGREE OF MASTER OF SCIENCEen_US
dc.description.abstractThe reactions of 2-chloro-5-nitro pyridine with piperidine have been studied in acetone and in nethanol. In acetone, the rate constants are measured as a function of the anine concentration. In methanol, the Arrhenius parameters are obtained. In methanol, except for a very slight (almost negligible) downward trend of rate constants at very high concentration which is explained in terms of Charge - transfer complexes, there is no base catalysis and the observed rate constants are the rates of formation of the intermediate complex. The rates of reaction of 1-X-2, 4-dinitrobenzene (X=F, Cl) with piperidine and n-butylamine in methanol, acetone, and chloroform (stabilised and destabilised) have been measured as a function of the amine concentration. In acetone, the reactions of both substrates with piperidine show true base catalysis with K3/K2 > 50 in both cases. In Chloroform with n-butylamine, there is very little rate increase with increasing amine concentration. For both Substrates, K3/K2=3. This is explained in terms of hydrogen-bonding in the intermediate state. In methanol, the reaction of the chloro Substrate with piperidine gives a small linear increase of rate constants with increasing amine concentration; while for the fluoro substrate, the graph of rate constants against amine concentration gives a doubly sloped curve. This is due to some special unknown medium effects. In acetone, the reactions with n-butylamine give rather peculiar results. The chloro substrate appears to be more sensitive to catalysis by amine than the fluoro substrate - a Situation hitherto unknown. In general, for the reactions in methanol and Chloroform, there is not much base influence; while those in acetone are dependent on the base strength.en_US
dc.language.isoenen_US
dc.titleTHE REACTIONS OF SOME ACTIVATED AROMATIC HALIDES WITH PIPERIDINS, AND N-BUTYLANINE IN DIPOLAR APROTIC AND DIPOLAR PROTIC SOLVENTSen_US
dc.typeThesisen_US
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