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Kinetics of 2,2′‐Bipyridyl‐Catalyzed Oxidation of Isopropyl Alcohol with Chromic Acid
Author(s) -
Lin TzucnYeuan,
Zeng HanWei,
Chuo ChinMing
Publication year - 1995
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199500008
Subject(s) - chemistry , chromic acid , steric effects , isopropyl alcohol , catalysis , alcohol , decomposition , chromium , kinetics , rate determining step , isopropyl , limiting , medicinal chemistry , reaction rate constant , photochemistry , inorganic chemistry , organic chemistry , mechanical engineering , physics , quantum mechanics , engineering
2,2′‐Bipyridyl and some substituted compounds catalyze effectively the oxidation of isopropyl alcohol by chromic acid. The reaction is first order in chromium(VI), alcohol and 2,2′‐bipyridyl; it is first order in hydrogen ions at high acidity and slightly alters to second order at low acidity. The proposed mechanism shows that the rate‐limiting step is mainly the decomposition of a termolecular complex to products. However, at low acidity, the formation step of this complex is a little less reversible and hence somewhat rate‐limiting. Electron‐donating substituents at the 4‐position enhance the catalytic activity. Electron‐withdrawing substituents at the 4‐ and 2‐positions diminish the reaction rates by electronic and steric factors.