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1.1.1 Nickel Complexes of 1,3-Dienes

DOI: 10.1055/sos-SD-001-00002

Montgomery, J.Science of Synthesis, (2001112.

Nickel complexes with 1,3-dienes are important intermediates in a variety of catalytic processes. In contrast to many classes of metaldiene complexes, such as those of iron and palladium in which metal complexation activates the π-system towards nucleophilic attack, (η4-diene)nickel complexes are most useful in cycloaddition processes and in couplings to polar π-systems such as carbonyls. Few examples of dienenickel complexes are structurally well characterized, but they are commonly invoked in the mechanisms of many synthetic procedures.