Sterically Hindered Benzophenones via Rhodium-Catalyzed Oxidative Arylation of Aldehydes.

[摘要]：27 Efficient cross-coupling, allowing a straightforward access to congested benzophenones, e.g., I, between arom. 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.

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