A simple, high-yield synthesis is described that leads to the sodium salt of monosulfonated triphenylphosphane (TPPMS Na ) as a pure product in large quantities without complicated workup techniques. The single-crystal X-ray structure of TPPMS Na ·2.5H 2 O is reported. The structure is built up by alternating layers of aquated sodium sulfonate units and hydrophobic triphenyl units. Thermogravimetric
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