The water present in cation and anion exchange resins for a series of counter-ions was examined spectroscopically using the 1.9 /l water band. The spectrum of the water in the resins dried to constant weight was characteristic for the counter-ion present. The changes in the wavelength of the maximum absorbance was compared to the behaviour of the spectrum of ions in solution. The spectra of these resins were also related to the hydration numbers of various ions.

Reactions of dimethyl benzoylphosphcnate (I) with various nucleophiles are described. The ester can serve simply as a useful benzoylatiqn agent or it can undergo addition reactions to give substituted a-hydroxybenzylphosphonates. Its keto-group can be reduced to hydroxyl and can participate in the Winig-Horner reaction. By the action of I with hydtoxylamine in the presence of sodium formare, benzonirrile is obtained.

Das Phosphonat (I) reagiert mit den Aminen (II)‐(X: H) in Gegenwart von Mgßr, in Äther zu den Amiden (IIIa)‐(IIIc) (ca.