Method of preparation of polyazacycloalkanes grafts on silica gel and use of compounds, certain

摘要

The invention concerns a method for preparing polyazacycloalkanes immobilised on a silica gel from a polyazacycloalkane of formula (A) in which: R1 and R2 represent a hydrogen atom, an alkyl radical, or a [hetero(aryl)]alkyl radical; W1, W2 and W3 represent a radical of formula (B): -[(CT1T2)n-[N(R3)]p-(CT3T4)m]l- such as defined in the description; R3 represents a hydrogen atom, an alkyl radical or a [hetero(aryl)]alkyl radical, provided that the polyazacycloalkane ring of the compound of formula (A) comprises not more than 30 cyclic carbon atoms, and not more than 6 cyclic nitrogen atoms. The invention is characterised in that: (a) the compound of formula (A) is reacted with a compound of formula (C): Z-R4-Si(X1)(X2)(X3), such as defined in the description to form a compound of formula (D); (b) said compound of formula (D) is condensed on the silanol sites of a silica gel to form the immobilised polyazacycloalkane of formula (E); and (c) some ethanol sites having not reacted are, if required, protected by Z', a group protecting the hydroxyl function. The invention is useful for separating oxygen from air.