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Journal Article

A Comparative Study of Dibenzylideneacetone Palladium Complexes in Catalysis

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Bongard,  Hans-Josef
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Weber, P., Biafora, A., Doppiu, A., Bongard, H.-J., Kelm, H., & Gooßen, L. J. (2019). A Comparative Study of Dibenzylideneacetone Palladium Complexes in Catalysis. Organic Process Research & Development, 23(7), 1462-1470. doi:10.1021/acs.oprd.9b00214.


Cite as: http://hdl.handle.net/21.11116/0000-0004-8E6E-2
Abstract
Commercial Pdx(dba)y from various suppliers was found to vary considerably in appearance, homogeneity, purity, and catalytic activity. The Buchwald–Hartwig amination of 4-bromoanisole (5) with aniline (6) was established as a sensitive test reaction to probe the efficiency of Pdx(dba)y batches in catalytic transformations. The yields obtained with 17 different Pdx(dba)y batches ranged from 10% to nearly quantitative and could not be predicted reliably on the basis of any physical or spectroscopic descriptor alone. The best results in the catalytic test reaction were consistently achieved with a self-made slowly crystallized Pd2(dba)3·toluene adduct. A protocol is disclosed that allows batches of Pdx(dba)y with unsatisfactory or inconsistent performance to be converted into this reliable precatalyst.