Hydration and Dehydration of the Pure Enantiomer and the Racemic of Phencyphos
F. Querniard1, M. Leeman, Y. Cartigny, R.M. Kellogg, E. Vlieg and G. Coquerel

Abstract:
This study is devoted to the understanding of phencyphos hydration/dehydration behaviour. Phencyphos is a resolving agent used in the so-called Dutch resolution. Batches of phencyphos contain various amounts of water (from 0 to 1 equivalent of water) evolving over time, inducing wrong dosages. Phase diagrams between phencyphos, water and methanol or ethanol were determined. Then, solid phases were characterized and compared with the means of X-ray Powder Diffraction, InfraRed spectroscopy, Differential Scanning Calorimetry and Dynamic Vapour Sorption. All these experiments have led to reliable conversion methods and storage conditions.