By Noyes W. A.
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Additional info for A Kinetic Hypothesis to Explain the Function of Electrons in the Chemical Combination of Atoms(en)(5
4 In addition, the Heck reaction enables the functionalization of various molecules with different substituents, which otherwise take multiple steps to produce. Thus, an impressive list of synthetically useful transformations is possible via the Heck reaction, allowing the reaction to get a place in the repertoire of synthetic organic chemists. 1). 11, 12 Not surprisingly, these C C bond forming reactions are also widely utilized as key steps for the syntheses of many organic chemicals, natural products, and a variety of industrial products,13–16 as can be seen in the other chapters of this book.
Pd nanoparticles). In the case of nanoparticle catalysts, it is because the reactants see only the atoms on surfaces of the nanoparticles, with no chance of interacting with those in the middle of the particles. Nonetheless, since nanoparticles have high surface areas and large numbers of surface atoms, this problem is not a major one. The second disadvantage of heterogeneous catalytic systems is the decrease in catalytic activity of the catalysts due to leaching of the active catalytic species into the reaction media.
8. Schematic structure of a core–shell microsphere composed of poly[styrene-co2-(acetoacetoxy)ethyl methacrylate-co-methyl acrylic acid] (or PS-co-PAEMA-co-PMAA), which was successfully used as a support material for Pd-NPs. 115 (Adapted with permission from Ref. ) synthesized. Using the right support material can result in heterogeneous catalysts that not only possess high catalytic efficiency but also easily become industrially attractive by reducing the costs associated with catalysis. Owing to their very high surface areas (typically 1000 m2 /g), tunable nanoscale pore dimensions and easily modifiable surfaces to anchor organic groups, organometallic complexes, or metallic nanoparticles, mesoporous materials stand out as excellent support/host materials for making heterogeneous catalysts for various reactions, including the Heck reaction.