Kinetics and mechanism of OsO4 catalyzed oxidation of chalcones by Ce4 in aqueous acetic sulfuric acid media |
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Authors: | P V Srinivasulu M Adinarayana B Sethuram and T Navaneeth Rao |
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Institution: | (1) Department of Chemistry, Osmania University, 500007 Hyderabad, A. P., India |
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Abstract: | Kinetics of OsO4 catalyzed oxidation of chalcones by Ce4+ has been studied in aqueous acetic-sulfuric acid medium in the temperature range 313 to 338 K. The order in oxidant] is zero while the order with respect to substrate] and catalyst] are each fractional. The rate of the reaction decreased with increase in percentage of acetic acid while H+] had practically no effect on the rate The rates of various substituted chalcones (with substituents in the phenyl. ring attached to the moiety) are in the orderp-CH3>m-CH3>H>p-Cl>m-Cl>m-NO2>p-NO2. A mechanism in which formation of a cyclic ester between chalcone and OsO4 in a fast step followed by its decomposition in a rate-determining step is envisaged.
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![pcy](/content/q4q7v0m347871667/xxlarge1087.gif) ![rcy](/content/q4q7v0m347871667/xxlarge1088.gif) ![icy](/content/q4q7v0m347871667/xxlarge1080.gif) ![scy](/content/q4q7v0m347871667/xxlarge1089.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![dcy](/content/q4q7v0m347871667/xxlarge1076.gif) ![icy](/content/q4q7v0m347871667/xxlarge1080.gif) ![ncy](/content/q4q7v0m347871667/xxlarge1085.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![ncy](/content/q4q7v0m347871667/xxlarge1085.gif) ![ncy](/content/q4q7v0m347871667/xxlarge1085.gif) ![ycy](/content/q4q7v0m347871667/xxlarge1099.gif) ![mcy](/content/q4q7v0m347871667/xxlarge1084.gif) ![ncy](/content/q4q7v0m347871667/xxlarge1085.gif) ![acy](/content/q4q7v0m347871667/xxlarge1072.gif) ![khcy](/content/q4q7v0m347871667/xxlarge1093.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) ![dcy](/content/q4q7v0m347871667/xxlarge1076.gif) ![yacy](/content/q4q7v0m347871667/xxlarge1103.gif) ![tcy](/content/q4q7v0m347871667/xxlarge1090.gif) ![scy](/content/q4q7v0m347871667/xxlarge1089.gif) ![scy](/content/q4q7v0m347871667/xxlarge1089.gif) ![lcy](/content/q4q7v0m347871667/xxlarge1083.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![dcy](/content/q4q7v0m347871667/xxlarge1076.gif) ![ucy](/content/q4q7v0m347871667/xxlarge1091.gif) ![yucy](/content/q4q7v0m347871667/xxlarge1102.gif) ![shchcy](/content/q4q7v0m347871667/xxlarge1097.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![pcy](/content/q4q7v0m347871667/xxlarge1087.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) ![rcy](/content/q4q7v0m347871667/xxlarge1088.gif) ![yacy](/content/q4q7v0m347871667/xxlarge1103.gif) ![dcy](/content/q4q7v0m347871667/xxlarge1076.gif) ![kcy](/content/q4q7v0m347871667/xxlarge1082.gif) : -CH3> -CH3>H> -Cl> -NO2> -NO2. ![Pcy](/content/q4q7v0m347871667/xxlarge1055.gif) ![rcy](/content/q4q7v0m347871667/xxlarge1088.gif) 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![lcy](/content/q4q7v0m347871667/xxlarge1083.gif) ![acy](/content/q4q7v0m347871667/xxlarge1072.gif) ![scy](/content/q4q7v0m347871667/xxlarge1089.gif) ![ncy](/content/q4q7v0m347871667/xxlarge1085.gif) ![kcy](/content/q4q7v0m347871667/xxlarge1082.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) ![tcy](/content/q4q7v0m347871667/xxlarge1090.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) ![rcy](/content/q4q7v0m347871667/xxlarge1088.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) ![mcy](/content/q4q7v0m347871667/xxlarge1084.gif) ![zcy](/content/q4q7v0m347871667/xxlarge1079.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) ![bcy](/content/q4q7v0m347871667/xxlarge1073.gif) ![rcy](/content/q4q7v0m347871667/xxlarge1088.gif) ![acy](/content/q4q7v0m347871667/xxlarge1072.gif) ![zcy](/content/q4q7v0m347871667/xxlarge1079.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) ![vcy](/content/q4q7v0m347871667/xxlarge1074.gif) ![acy](/content/q4q7v0m347871667/xxlarge1072.gif) ![ncy](/content/q4q7v0m347871667/xxlarge1085.gif) ![icy](/content/q4q7v0m347871667/xxlarge1080.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![tscy](/content/q4q7v0m347871667/xxlarge1094.gif) ![icy](/content/q4q7v0m347871667/xxlarge1080.gif) ![kcy](/content/q4q7v0m347871667/xxlarge1082.gif) ![lcy](/content/q4q7v0m347871667/xxlarge1083.gif) ![icy](/content/q4q7v0m347871667/xxlarge1080.gif) ![chcy](/content/q4q7v0m347871667/xxlarge1095.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![scy](/content/q4q7v0m347871667/xxlarge1089.gif) ![kcy](/content/q4q7v0m347871667/xxlarge1082.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) ![gcy](/content/q4q7v0m347871667/xxlarge1075.gif) ![ecy](/content/q4q7v0m347871667/xxlarge1101.gif) ![fcy](/content/q4q7v0m347871667/xxlarge1092.gif) ![icy](/content/q4q7v0m347871667/xxlarge1080.gif) ![rcy](/content/q4q7v0m347871667/xxlarge1088.gif) ![mcy](/content/q4q7v0m347871667/xxlarge1084.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![zhcy](/content/q4q7v0m347871667/xxlarge1078.gif) ![dcy](/content/q4q7v0m347871667/xxlarge1076.gif) ![khcy](/content/q4q7v0m347871667/xxlarge1093.gif) ![acy](/content/q4q7v0m347871667/xxlarge1072.gif) ![lcy](/content/q4q7v0m347871667/xxlarge1083.gif) ![kcy](/content/q4q7v0m347871667/xxlarge1082.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) ![ncy](/content/q4q7v0m347871667/xxlarge1085.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) OsO4 ![ncy](/content/q4q7v0m347871667/xxlarge1085.gif) ![bcy](/content/q4q7v0m347871667/xxlarge1073.gif) ![ycy](/content/q4q7v0m347871667/xxlarge1099.gif) ![scy](/content/q4q7v0m347871667/xxlarge1089.gif) ![tcy](/content/q4q7v0m347871667/xxlarge1090.gif) ![rcy](/content/q4q7v0m347871667/xxlarge1088.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) ![scy](/content/q4q7v0m347871667/xxlarge1089.gif) ![tcy](/content/q4q7v0m347871667/xxlarge1090.gif) ![ucy](/content/q4q7v0m347871667/xxlarge1091.gif) ![pcy](/content/q4q7v0m347871667/xxlarge1087.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![ncy](/content/q4q7v0m347871667/xxlarge1085.gif) ![scy](/content/q4q7v0m347871667/xxlarge1089.gif) ![lcy](/content/q4q7v0m347871667/xxlarge1083.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![dcy](/content/q4q7v0m347871667/xxlarge1076.gif) ![ucy](/content/q4q7v0m347871667/xxlarge1091.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![gcy](/content/q4q7v0m347871667/xxlarge1075.gif) ![rcy](/content/q4q7v0m347871667/xxlarge1088.gif) ![acy](/content/q4q7v0m347871667/xxlarge1072.gif) ![zcy](/content/q4q7v0m347871667/xxlarge1079.gif) ![lcy](/content/q4q7v0m347871667/xxlarge1083.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) ![zhcy](/content/q4q7v0m347871667/xxlarge1078.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![ncy](/content/q4q7v0m347871667/xxlarge1085.gif) ![icy](/content/q4q7v0m347871667/xxlarge1080.gif) , ![yacy](/content/q4q7v0m347871667/xxlarge1103.gif) ![vcy](/content/q4q7v0m347871667/xxlarge1074.gif) ![lcy](/content/q4q7v0m347871667/xxlarge1083.gif) ![yacy](/content/q4q7v0m347871667/xxlarge1103.gif) ![yucy](/content/q4q7v0m347871667/xxlarge1102.gif) ![shchcy](/content/q4q7v0m347871667/xxlarge1097.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![scy](/content/q4q7v0m347871667/xxlarge1089.gif) ![scy](/content/q4q7v0m347871667/xxlarge1089.gif) ![tcy](/content/q4q7v0m347871667/xxlarge1090.gif) ![ucy](/content/q4q7v0m347871667/xxlarge1091.gif) ![pcy](/content/q4q7v0m347871667/xxlarge1087.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![ncy](/content/q4q7v0m347871667/xxlarge1085.gif) ![softcy](/content/q4q7v0m347871667/xxlarge1100.gif) , ![lcy](/content/q4q7v0m347871667/xxlarge1083.gif) ![icy](/content/q4q7v0m347871667/xxlarge1080.gif) ![mcy](/content/q4q7v0m347871667/xxlarge1084.gif) ![icy](/content/q4q7v0m347871667/xxlarge1080.gif) ![tcy](/content/q4q7v0m347871667/xxlarge1090.gif) ![icy](/content/q4q7v0m347871667/xxlarge1080.gif) ![rcy](/content/q4q7v0m347871667/xxlarge1088.gif) ![ucy](/content/q4q7v0m347871667/xxlarge1091.gif) ![yucy](/content/q4q7v0m347871667/xxlarge1102.gif) ![shchcy](/content/q4q7v0m347871667/xxlarge1097.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![scy](/content/q4q7v0m347871667/xxlarge1089.gif) ![kcy](/content/q4q7v0m347871667/xxlarge1082.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) ![rcy](/content/q4q7v0m347871667/xxlarge1088.gif) ![ocy](/content/q4q7v0m347871667/xxlarge1086.gif) ![scy](/content/q4q7v0m347871667/xxlarge1089.gif) ![tcy](/content/q4q7v0m347871667/xxlarge1090.gif) ![rcy](/content/q4q7v0m347871667/xxlarge1088.gif) ![iecy](/content/q4q7v0m347871667/xxlarge1077.gif) ![acy](/content/q4q7v0m347871667/xxlarge1072.gif) ![kcy](/content/q4q7v0m347871667/xxlarge1082.gif) ![tscy](/content/q4q7v0m347871667/xxlarge1094.gif) ![icy](/content/q4q7v0m347871667/xxlarge1080.gif) .
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