Chemistry Letters, Vol.30, No.11, 1104-1105, 2001
Synthesis of a new tridentate anthracene ligand bearing (i-Pr)(2)P group at 1,8-positions: Facile bond switch on tetracoordinate boron atom
9-Borylanthracene 12 was prepared from 1,8-bis(diisopropylphosphino)-9-bromoanthracene (5) and the X-ray structure of 12 shows a tetrahedral boron atom coordinated by only one of the two (i-Pr)(2)P groups. However, anthracene protons were observed symmetrically in H-1 NMR even at -80 degreesC, clearly indicating that the intramolecular bond-switching process is taking place very rapidly in solution.