Parastannyl Chloride, Sn₅O₉Cl₂

Parastannyl Chloride, Sn₅O₉Cl₂.2H₂O, is produced by acting on parastannic acid with concentrated hydrochloric acid, dissolving the product in water, and precipitating the opalescent solution thus produced with more acid; the precipitate is then dried in a vacuum. This chloride is also formed in solution when a hydrochloric acid solution of β-stannyl chloride is warmed.