Synthetic, spectroscopic and mechanistic studies of Pd(II)-carbon bonding in chloranilatopalladium(II) complexes
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Abstract
The organometallic chemistry of palladium(II) has slowly built momentum. While the early work focused on coordination of organic molecules to palladium, the evolution of industrial catalytic applications of palladium(II) compounds stimulated a search for reactions mediated by palladium. The growth is reflected in the appearance of several books I'2'^ devoted to the chemistry of palladium and about 30 reviews in the last 15 years. However, the complexities and subdeties of organopalladium chemistry have hampered the understanding and adoption of palladium mediated reactions in organic synthesis. For example, dramatic changes in chemoselectivity, regioselectivity and stereocontrol can frequendy be accomplished by minor modifications of experimental conditions, especially choice of ligands. These effects are mainly due to structural and/or kinetic requirements of Pd(II) intermediates involved in the specific reaction. To increase both predictability and apphcabiUty of palladium mediated reactions in organic synthesis, it is of great importance to investigate the structural and kinetic natures of Pd(Il) intermediates.