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Updated: Jul 11, 2026

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)
Published on: November 22, 2016
1,8,9-Substituted anthracenes, intramolecular phosphine donor stabilized metaphosphonate and phosphenium
Petr Kilian1, Alexandra M Z Slawin
1School of Chemistry, EastCHEM, University of St Andrews, St Andrews, Fife, UK. pk7@st-andrews.ac.uk
Abstract:
A series of 1,8,9-tris(phosphorus) substituted anthracenes was synthesised and fully characterised. Their molecular geometry is such that the middle phosphorus atom is in a highly congested space, with terminal phosphorus atoms in close proximity. The middle phosphorus atom accepts electron density from none, one or both terminal phosphorus atoms to form P-P bonds. Thus phosphino (repulsively interacting), metaphosphonato (single donor stabilised) as well as phosphenium (doubly phosphine donor stabilised) environments around the phosphorus atom in position 9 were synthesized and structurally characterised. Observed P[dot dot dot]P distances range from 2.22 to 3.27 A.
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