Abstract
AbstractPhotolysis 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 CB 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 BP as a valence isoelectronic substitute for CC in arene systems.
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