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Updated: Jun 2, 2026

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)
Published on: November 22, 2016
A sodium salt of the dimer of boronoterephthalic acid anhydride
Scott Simmons1, Albert Fratini, Vladimir Benin
1Department of Chemistry, University of Dayton, 300 College Park, Dayton, OH 45469-2357, USA.
Abstract:
The title compound, sodium bis(6-carboxy-1-hydroxy-3-oxo-1,3-dihydro-2,1-benzoxaborol-1-yl)oxidanium, Na(+)·C(16)H(15)B(2)O(13)(-), was prepared in two steps from 2-bromo-p-xylene. Its crystal structure was determined at 140 K and has triclinic ( ̅P1) symmetry. The compound presents a unique structural motif, including two units of the cyclic anhydride of boronoterephthalic acid, joined by a protonated, and thereby trivalent, oxonium center. Association in the crystal is realized by complementary hydrogen bonding of the carboxyl groups, as well as by coordination of the sodium cations to the oxygen centers on the five-membered rings.
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