Preferential oxidative addition in Suzuki cross-coupling reactions across one fluorene unit.
The Suzuki-type cross-coupling reaction of 2,7-dihalofluorenes with 1 equiv of arylboronic acid and Pd2(dba)3/P(t-Bu3) as a catalyst system is investigated. The exclusive formation of the diarylated coupling product demonstrates that "preferential oxidative addition" is also applicable to fluorene monomers due to a controlled intramolecular motion of the regenerated Pd(0) catalyst across the "large" distance between the 2- and the 7-position of one fluorene monomer.
Weber
Sven K
SK
Makromolekulare Chemie and Institut für Polymertechnologie, Bergische Universität Wuppertal, Gauss-Strasse 20, D-42097 Wuppertal, Germany.
Galbrecht
Frank
F
Scherf
Ullrich
U