Synthesis of a New Tridentate Anthracene Ligand Bearing (<i>i</i>-Pr)<sub>2</sub>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)2P groups. However, anthracene protons were observed symmetrically in 1H NMR even at −80 °C, clearly indicating that the intramolecular bond-switching process is taking place very rapidly in solution.