title: Sterically hindered benzophenones via rhodium-catalyzed oxidative arylation of aldehydes.
abstract: Efficient cross-coupling, allowing a straightforward access to congested benzophenones, between aromatic aldehydes and potassium aryltrifluoroborates, is described in the presence of a rhodium/tri-tert-butylphosphane catalyst system and acetone as cosolvent. The use of the stable phosphonium salts of tri-tert-butylphosphane prevented the use of highly oxidizable tri-tert-butylphosphane and allowed a careful control of the stoichiometry with the rhodium.
authors.affiliation: Laboratoire de Synthèse Sélective Organique (UMR 7573, CNRS), Ecole Nationale Supérieure de Chimie de Paris, 11 rue P&M Curie, 75231 Paris cedex 05, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Chuzel
authors.forename: Alexander
authors.initials: A
authors.lastname: Roesch
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Genet
authors.forename: Sylvain
authors.initials: S
authors.lastname: Darses