| abstract |
A new mono-silylating agent of general formula (I) n n (R.sub.1,R.sub.2,R.sub.3)Si--NH--CO--O--Si(R.sub.1,R.sub.2,R.sub.3) (I) n n is described as well as its use in the preparation of chromatographic supports based on silica with functional groups covalently bonded thereto, the so-called "bonded stationary phases". n The new compounds are easy and safe to prepare from the coresponding mono-halosilanes with ammonium carbamate, and their use as silylating agents leads to stationary phases with a higher degree of surface coating than that attainable with the corresponding chlorosilanes. |