ISSN:
1573-9171
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary 1. Measurements have been made of the rate of the reaction between anthracene (9,10-dichloroanthracene) in aqueous suspension and chlorine at 2–3° and at 15–16°, using chlorine concentrations of 0.01 N and 0.05 N. The oxidation by chlorine of anthracene in aqueous suspension proceeds as a first-order reaction with respect to active chlorine. The reaction rate increases with increase in the concentration of active chlorine and is reduced by the hydrochloric acid that is formed; it is expressed by the equation: $$ - \frac{{d[Cl_2 ]}}{{dt}} = k'_2 \frac{{[Cl_2 ]}}{{[HCl]}}$$ 2. It has been shown that the rate of oxidation of anthracene by chlorine water falls sharply towards the end owing to the formation of 9,10-dichloroanthracene, for the rate of the oxidation of the latter is many times less than the rate of the anthracene reaction. 3. The products of the oxidation of anthracene by aqueous chlorine at 15–16° for 60 hr have been isolated and identified. They are: anthraquinone (62%), 9,10-dihydroxyanthracene and oxanthranol (7%), 9-hydroxyanthracene (3%), 9,10-dichloroanthracene (12%), and unchanged anthracene (13%). 4. The mechanism of the oxidation of anthracene by aqueous chlorine has been indicated. 5. Measurements have been made of the rate of oxidation of anthracene and of 9,10-dichloroanthracene by the oxidizing agents: K2Cr2O7 + H2SO4aq and KMnO4 + KOnaq. It has been shown: 1) that the rate of oxidation of anthracene, both in acid and in alkaline solution, is many times higher than the rate of oxidation of 9,10-dichloroanthracene, and 2)_that the rate of oxidation in alkaline medium is 4 to 5 times higher than in acid medium in the case of anthracen and is 60 to 80 times higher in the case of 9,10-dichloroanthracene.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01176582
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