Bedford, R.B., Betham, M., Charmant, J.P.H., Haddow, M.F., Orpen, A.G., Pilarski, L.T., Coles, S.J. and Hursthouse, M.B. (2007) Simple palladacyclic and platinacyclic catalysts for the 1,4-conjugate addition of arylboronic acids and arylsiloxanes to enones. Organometallics, 26 (25), 6346-6353. (doi:10.1021/om700724c).
Abstract
range of palladacyclic, platinacyclic, and pincer-based catalysts have been tested for activity in 1,4-conjugate addition reactions. -Acidic palladacycles show excellent activity at room temperature in the reaction of enones with arylboronic acids and reasonable activity when the arylboronic acids are replaced by arylsiloxanes. The X-ray structures of three new palladium 3-"PCP"-pincer complexes are presented; surprisingly, these complexes show no activity, despite the fact that notionally related phosphine and carbene adducts of palladacycles do.
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