Abstract
The oxidation reactions of D-sucrose have been carried out with N-bromophthalimide in the presence of micellar aggregates at 45°C. The kinetics revealed first order dependence on N-bromophthalimide (NBP) and fractional order dependence on D-sucrose. Variation of mercuric acetate concentration has an insignificant effect on reaction rate. The stoichiometric ratio of NBP:D-sucrose was 1:2 and the oxidation product was aldonic acid confirmed by FeCl3–HCl test. The influence of salts on the reaction rate has also been studied. Phthalimide (NHP) and sulfuric acid (H2SO4) inhibit the rate. Thermodynamic and activation parameters have been evaluated and a mechanism consistent with the kinetic data has been proposed. Cetyltrimethylammonium bromide (CTAB) and TritonX-100 (TX-100) catalyze the reaction, while sodium dodecyl sulfate (SDS) inhibits the rate of reaction. The applicability of Berezin's model was tested to explain the observed micellar effects. The rate constants (kM) and binding constants (KS + KO) have been evaluated.
Kurzfassung
Die Oxidationsreaktion von Saccharose wurde mit N-Bromphthalimid in Anwesenheit von micellaren Aggregaten bei 45°C durchgeführt. Die Kinetik zeigte ein Verhalten 1. Ordnung von N-Bromphthalimid (NBP) und eine gebrochene Ordnung von Saccharose. Die Veränderung der Quecksilberacetatkonzentration hat einen unwesentlichen Einfluss auf die Reaktionsrate. Das stöchometrische Verhältnis von NBP:Saccharose war 1:2. Das Oxidationsprodukt Aldonsäure wurde durch den FeCl3–HCl-Test bestätigt. Der Einfluss von Salzen auf die Reaktionsgeschwindigkeit wurde ebenfalls untersucht. Phthalimid (NHP) und Schwefelsäure hemmen die Reaktionsgeschwindigkeit. Die Thermodynamik- und die Aktivierungsparameter wurden ermittelt und ein Mechanismus für eine konsistente Deutung der Daten vorgeschlagen. Cetyltrimethylammoniumbromid (CTAB) und TritonX-100 (TX-100) beschleunigen die Reaktion, während Natriumdodecylsulfat (SDS) die Reaktionsgeschwindigkeit verringert. Die Anwendbarkeit des Berezin Modells für die Erklärung der mizellaren Effekte wurde geprüft. Die Geschwindigkeitskonstante kM und die Bindungskonstanten (KS + KO) wurden ermittelt.
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