The present invention relates to the use of the compound of the formula (I) where the variables are as defined in the claims and the description, or of a mixture thereof, as a
monomer for producing a
thermoplastic resin selected from polyesters, polycarbonates and polyestercarbonates. The invention relates moreover to compounds (I), except for compounds where A1 and A2 are both unsubstituted 1,4-
phenylene, p and q are both 0, and X1 and X2 are both —CH2OH or —C(O)OH, and except for the compound where A1 and A2 are both unsubstituted 2,3-quinolinylene, p and q are both 0, and X1 and X2 are both —CH2OH.