By Bhaduri S., Mukesh D.
This well timed booklet responds to the necessity within the chemical for a guidebook dedicated to the most important strategies of homogeneous catalysis. targeting homogeneous catalytic reactions with confirmed business purposes, this useful paintings is helping business chemists bridge the distance among imaginitive educational study and winning know-how.
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Extra resources for Homogeneous Catalysis
3 as a catalytic intermediate. 3 Model Compounds and Theoretical Calculations Many compounds have been synthesized, characterized, and studied as models for proposed intermediates in various homogeneous catalytic reactions. Here we discuss two examples. 4 is proposed as a model that shows the mode of interaction between an organic hydroperoxide and high-valent metal ions such as Ti4ϩ, V5ϩ, and Mo6ϩ. This type of interaction is considered to be necessary for the oxygen atom transfer from the hydroperoxide to an alkene to give an epoxide (see Chapter 8).
H. Crabtree, Wiley, New York, 1994. Molecular Chemistry of the Transition Elements, F. Mathey and A. Sevin, Wiley, 1996. 36 BASIC CHEMICAL CONCEPTS Organometallic Chemistry, G. O. Spessard and G. L. Meissler, Prentice Hall, New Jersey, 1996. Organometallics: A Concise Introduction, Ch. Elschenbroich and A. Salzer, VCH, Weinheim, 1989. Articles For oxidative addition of methane to cyclopentadiene iridium complexes, see: J. K. Hoyano and W. A. G. Graham, J. Am. Chem. Soc. 104, 3723–25 (1982). For nucleophilic attack on coordinated, CO see: P.
A thermodynamically favorable reaction (⌬G < 0) may not take place because the free energy of activation may be too high. On the other hand, a thermodynamically unfavorable reaction (⌬G > 0) may occur if the free energy of activation is low. There are many examples: The conversion of diamond to graphite is thermodynamically favorable but happens only at a vanishingly small rate at room temperature and pressure. A mixture of nitrogen and hydrogen does not automatically form ammonia; a considerable amount of energy has to be provided to overcome the activation energy barrier.