NOVEL SILICA GEL INCORPORATING POLYAZACYCLOALKANE UNITS COMPRISING MORE THAN SIX NITROGEN ATOMS, PREPARATION PROCESS AND USE

摘要

Novel silica gel incorporating polyazacycloalkane units comprising more than six nitrogen atoms, preparation process and use Compound of formula (I): (see formula I) in which W1, W2 and W3, which are identical or different, each represent, independently of one another, a divalent radical chosen from those represented by the general formula (A): -[(CT5T6)a-(CT1T2)n-[N(R4)]p-(CT3T4)m- (CT7T8)b]l- (A) as defined in the description and in which R4 represents a hydrogen atom, an alkyl radical, a [(hetero)aryl] alkyl radical or a radical represented by the general formula (B), R5-Si(X1)(X2)(X3), as defined in the description, and R1, R2 and R3, which are identical or different, each represent, independently of one another and of R4, a hydrogen atom, an alkyl radical, a [(hetero)aryl]alkyl radical comprising from 7 to 12 carbon atoms or a radical represented by the general formula (B), it being understood that the compound of formula (I) comprises more than six cyclic nitrogen atoms. Preparation process; use in the synthesis of polysiloxane gels; use of the said gels in purifying oxygen or extracting oxygen from the air and in purifying liquids.