Abstract: Novel crosslinked resins comprising at least one substituted aryl group having a functional substituent group of the general formula ##STR1## can be prepared via the addition reaction of a crosslinked resin comprising at least one substituted aryl group having a functional substituent group of general formula ##STR2## and an ester of an alkenesulfonic acid of general formulaC(H)(R.sup.1).dbd.C(H)--SO.sub.3 R.sup.3 (III),wherein, a is 0 or 1, b is 1 or 2, d is 1 or 2, e is 0 or 1, R.sup.1 represents H or a C.sub.1 -C.sub.4 alkyl group, R.sup.2 is a --CN or a carboxyester group, R.sup.3 is a hydrocarbyl group, M is a proton or another cation, and moreover that in general formula (I) b+d+e=3, and in general formula (II) that b+e=2 and b is 2 each R.sup.2 is a --CN or a carboxyester group, followed by hydrolysis of the addition product into a functional group of general formula (I). Said resins are extremely stable at elevated temperatures in water or aqueous media and show a high catalytic activity.

Abstract: Novel crosslinked resins comprising at least on substituted aryl group having a functional substituent group of the general formula ##STR1## can be prepared via the addition reaction of a crosslinked resin comprising at least one substituted aryl group having a functional substituent group of general formula ##STR2## and an ester of an alkenesulfonic acid of general formulaC(H)(R.sup.1).dbd.C(H)-SO.sub.3 R.sup.3 (III),wherein, a is 0 or 1, b is 1 or 2, d is 1 or 2, e is 0 or 1, R.sup.1 represents H or a C.sub.1 -C.sub.4 alkyl group, R.sup.2 is a --CN or a carboxyester group, R.sup.3 is hydrocarbyl group, M is a proton or another cation, and moreover that in general formula (I) b+d+e=3, and in general formula (II) that b+e=2 and if b is 2 each R.sup.2 is a --CN or a carboxyester group, followed by hydrolysis of the addition product into a functional group of general formula (I). Said resins are extremely stable at elevated temperatures in water or aqueous media and show a high catalytic activity.