title: 1,2-Phosphaborines: hybrid inorganic/organic P-B analogues of benzene.
abstract: Photolysis of the cyclic phosphine oligomer [PPh]5 in the presence of pentaarylboroles leads to the formation of 1,2-phosphaborines by the formal insertion of a phenylphosphinidene fragment into the endocyclic CB bond. The solid-state structure features a virtually planar central ring with bond lengths indicating significant delocalization. Appreciable ring current in the 1,2-phosphaborine core, detected in nuclear independent chemical shift (NICS) calculations, are consistent with aromatic character. These products are the first reported 1,2-BPC4 conjugated heterocycles and open a new avenue for BP as a valence isoelectronic substitute for CC in arene systems.
authors: Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, TX 76798-7343 (USA).
authors: Jonathan H
authors: JH
authors: Barnard
authors: Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, TX 76798-7343 (USA).
authors: Paul A
authors: PA
authors: Brown
authors: Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, TX 76798-7343 (USA).
authors: Kevin L
authors: KL
authors: Shuford
authors: Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, TX 76798-7343 (USA). caleb_d_martin@baylor.edu.
authors: Caleb D
authors: CD
authors: Martin
keywords: aromaticity; boroles; boron; phosphorus; ring expansion