Abstract
The nickel(0) catalyst is a complex containing olefins and trialkyl or triaryl phosphite or phosphine ligands. Subsequently, we showed that cobalt(0) complexes are even more specific catalysts for this dimerization (2). We now find that if the nickel-catalyzed dimerization is carried out in an excess of an olefin such as methyl acrylate or styrene, another type of dimer is produced, containing a cyclooctatetraene structure. Cyclohexene is also effective, although to a lesser extent, whereas simple olefins are relatively unreactive. Cobalt catalysts do not appear to be susceptible to this olefin effect. The reaction is specific for substituted dipropargylamines containing substituents on the a-carbons (Equation 2):
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